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[PATCH] drm/bridge: samsung-dsim: Fix device node reference leak in samsung_dsim_parse_dt

by Miaoqian Lin

The function samsung_dsim_parse_dt() calls of_graph_get_endpoint_by_regs() to get the endpoint device node, but fails to call of_node_put() to release the reference when the function returns. This results in a device node reference leak. Fix this by adding the missing of_node_put() call before returning from the function. Found via static analysis and code review. Fixes: 77169a11d4e9 ("drm/bridge: samsung-dsim: add driver support for exynos7870 DSIM bridge") Cc: stable(a)vger.kernel.org Signed-off-by: Miaoqian Lin <linmq006(a)gmail.com> --- drivers/gpu/drm/bridge/samsung-dsim.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/gpu/drm/bridge/samsung-dsim.c b/drivers/gpu/drm/bridge/samsung-dsim.c index eabc4c32f6ab..1a5acd5077ad 100644 --- a/drivers/gpu/drm/bridge/samsung-dsim.c +++ b/drivers/gpu/drm/bridge/samsung-dsim.c @@ -2086,6 +2086,7 @@ static int samsung_dsim_parse_dt(struct samsung_dsim *dsi) if (lane_polarities[1]) dsi->swap_dn_dp_data = true; } + of_node_put(endpoint); return 0; } -- 2.39.5 (Apple Git-154)

1 week

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[PATCH] LoongArch: BPF: Disable bpf trampoline kernel module function trace

by Vincent Li

The current LoongArch BPF trampoline implementation is incompatible with tracing functions in kernel modules. This causes several severe and user-visible problems: * Kernel lockups when a BPF program is attached to a module function [0]. * The `bpf_selftests/module_attach` test fails consistently. * Critical kernel modules like WireGuard experience traffic disruption when their functions are traced with fentry [1]. Given the severity and the potential for other unknown side-effects, it is safest to disable the feature entirely for now. This patch prevents the BPF subsystem from allowing trampoline attachments to module functions on LoongArch. This is a temporary mitigation until the core issues in the trampoline code for module handling can be identified and fixed. [root@fedora bpf]# ./test_progs -a module_attach -v bpf_testmod.ko is already unloaded. Loading bpf_testmod.ko... Successfully loaded bpf_testmod.ko. test_module_attach:PASS:skel_open 0 nsec test_module_attach:PASS:set_attach_target 0 nsec test_module_attach:PASS:set_attach_target_explicit 0 nsec test_module_attach:PASS:skel_load 0 nsec libbpf: prog 'handle_fentry': failed to attach: -ENOTSUPP libbpf: prog 'handle_fentry': failed to auto-attach: -ENOTSUPP test_module_attach:FAIL:skel_attach skeleton attach failed: -524 Summary: 0/0 PASSED, 0 SKIPPED, 1 FAILED Successfully unloaded bpf_testmod.ko. [0]: https://lore.kernel.org/loongarch/CAK3+h2wDmpC-hP4u4pJY8T-yfKyk4yRzpu2LMO+C… [1]: https://lore.kernel.org/loongarch/CAK3+h2wYcpc+OwdLDUBvg2rF9rvvyc5amfHT-KcF… Cc: stable(a)vger.kernel.org Fixes: f9b6b41f0cf3 (“LoongArch: BPF: Add basic bpf trampoline support”) Closes: https://lore.kernel.org/loongarch/CAK3+h2wDmpC-hP4u4pJY8T-yfKyk4yRzpu2LMO+C… Acked-by: Hengqi Chen <hengqi.chen(a)gmail.com> Signed-off-by: Vincent Li <vincent.mc.li(a)gmail.com> --- arch/loongarch/net/bpf_jit.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/loongarch/net/bpf_jit.c b/arch/loongarch/net/bpf_jit.c index cbe53d0b7fb0..49c1d4b95404 100644 --- a/arch/loongarch/net/bpf_jit.c +++ b/arch/loongarch/net/bpf_jit.c @@ -1624,6 +1624,9 @@ static int __arch_prepare_bpf_trampoline(struct jit_ctx *ctx, struct bpf_tramp_i /* Direct jump skips 5 NOP instructions */ else if (is_bpf_text_address((unsigned long)orig_call)) orig_call += LOONGARCH_BPF_FENTRY_NBYTES; + /* Module tracing not supported - causes kernel lockups */ + else if (is_module_text_address((unsigned long)orig_call)) + return -ENOTSUPP; if (flags & BPF_TRAMP_F_CALL_ORIG) { move_addr(ctx, LOONGARCH_GPR_A0, (const u64)im); -- 2.38.1

1 week

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[PATCH] LoongArch: BPF: Disable bpf trampoline kernel module function trace

by Vincent Li

The current LoongArch BPF trampoline implementation is incompatible with tracing functions in kernel modules. This causes several severe and user-visible problems: * Kernel lockups when a BPF program is attached to a module function [0]. * The `bpf_selftests/module_attach` test fails consistently. * Critical kernel modules like WireGuard experience traffic disruption when their functions are traced with fentry [1]. Given the severity and the potential for other unknown side-effects, it is safest to disable the feature entirely for now. This patch prevents the BPF subsystem from allowing trampoline attachments to module functions on LoongArch. This is a temporary mitigation until the core issues in the trampoline code for module handling can be identified and fixed. [root@fedora bpf]# ./test_progs -a module_attach -v bpf_testmod.ko is already unloaded. Loading bpf_testmod.ko... Successfully loaded bpf_testmod.ko. test_module_attach:PASS:skel_open 0 nsec test_module_attach:PASS:set_attach_target 0 nsec test_module_attach:PASS:set_attach_target_explicit 0 nsec test_module_attach:PASS:skel_load 0 nsec libbpf: prog 'handle_fentry': failed to attach: -ENOTSUPP libbpf: prog 'handle_fentry': failed to auto-attach: -ENOTSUPP test_module_attach:FAIL:skel_attach skeleton attach failed: -524 Summary: 0/0 PASSED, 0 SKIPPED, 1 FAILED Successfully unloaded bpf_testmod.ko. [0]: https://lore.kernel.org/loongarch/CAK3+h2wDmpC-hP4u4pJY8T-yfKyk4yRzpu2LMO+C… [1]: https://lore.kernel.org/loongarch/CAK3+h2wYcpc+OwdLDUBvg2rF9rvvyc5amfHT-KcF… Cc: stable(a)vger.kernel.org Fixes: f9b6b41f0cf3 (“LoongArch: BPF: Add basic bpf trampoline support”) Closes: https://lore.kernel.org/loongarch/CAK3+h2wDmpC-hP4u4pJY8T-yfKyk4yRzpu2LMO+C… Acked-by: Hengqi Chen <hengqi.chen(a)gmail.com> Signed-off-by: Vincent Li <vincent.mc.li(a)gmail.com> --- arch/loongarch/net/bpf_jit.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/loongarch/net/bpf_jit.c b/arch/loongarch/net/bpf_jit.c index cbe53d0b7fb0..49c1d4b95404 100644 --- a/arch/loongarch/net/bpf_jit.c +++ b/arch/loongarch/net/bpf_jit.c @@ -1624,6 +1624,9 @@ static int __arch_prepare_bpf_trampoline(struct jit_ctx *ctx, struct bpf_tramp_i /* Direct jump skips 5 NOP instructions */ else if (is_bpf_text_address((unsigned long)orig_call)) orig_call += LOONGARCH_BPF_FENTRY_NBYTES; + /* Module tracing not supported - causes kernel lockups */ + else if (is_module_text_address((unsigned long)orig_call)) + return -ENOTSUPP; if (flags & BPF_TRAMP_F_CALL_ORIG) { move_addr(ctx, LOONGARCH_GPR_A0, (const u64)im); -- 2.38.1

1 week

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Re: Patch "mptcp: drop bogus optimization in __mptcp_check_push()" has been added to the 5.15-stable tree

by Matthieu Baerts

Hi Greg, Sasha, On 03/11/2025 02:38, gregkh(a)linuxfoundation.org wrote: > > This is a note to let you know that I've just added the patch titled > > mptcp: drop bogus optimization in __mptcp_check_push() > > to the 5.15-stable tree which can be found at: > http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=sum… > > The filename of the patch is: > mptcp-drop-bogus-optimization-in-__mptcp_check_push.patch > and it can be found in the queue-5.15 subdirectory. > > If you, or anyone else, feels it should not be added to the stable tree, > please let <stable(a)vger.kernel.org> know about it. Can you please drop this patch from v5.15? It looks like it is causing some issues with MP_PRIO tests. I think that's because back then, the path is selected differently, with the use of 'msk->last_snd' which will bypass some decisions to where to send the next data. I will try to check if another version of this patch is needed for v5.15. Cheers, Matt (I kept the patch below just in case some people from the MPTCP ML want to react.) > From stable+bounces-192087-greg=kroah.com(a)vger.kernel.org Mon Nov 3 05:15:58 2025 > From: Sasha Levin <sashal(a)kernel.org> > Date: Sun, 2 Nov 2025 15:15:50 -0500 > Subject: mptcp: drop bogus optimization in __mptcp_check_push() > To: stable(a)vger.kernel.org > Cc: Paolo Abeni <pabeni(a)redhat.com>, Geliang Tang <geliang(a)kernel.org>, Mat Martineau <martineau(a)kernel.org>, "Matthieu Baerts (NGI0)" <matttbe(a)kernel.org>, Jakub Kicinski <kuba(a)kernel.org>, Sasha Levin <sashal(a)kernel.org> > Message-ID: <20251102201550.3588174-1-sashal(a)kernel.org> > > From: Paolo Abeni <pabeni(a)redhat.com> > > [ Upstream commit 27b0e701d3872ba59c5b579a9e8a02ea49ad3d3b ] > > Accessing the transmit queue without owning the msk socket lock is > inherently racy, hence __mptcp_check_push() could actually quit early > even when there is pending data. > > That in turn could cause unexpected tx lock and timeout. > > Dropping the early check avoids the race, implicitly relaying on later > tests under the relevant lock. With such change, all the other > mptcp_send_head() call sites are now under the msk socket lock and we > can additionally drop the now unneeded annotation on the transmit head > pointer accesses. > > Fixes: 6e628cd3a8f7 ("mptcp: use mptcp release_cb for delayed tasks") > Cc: stable(a)vger.kernel.org > Signed-off-by: Paolo Abeni <pabeni(a)redhat.com> > Reviewed-by: Geliang Tang <geliang(a)kernel.org> > Tested-by: Geliang Tang <geliang(a)kernel.org> > Reviewed-by: Mat Martineau <martineau(a)kernel.org> > Signed-off-by: Matthieu Baerts (NGI0) <matttbe(a)kernel.org> > Link: https://patch.msgid.link/20251028-net-mptcp-send-timeout-v1-1-38ffff5a9ec8@… > Signed-off-by: Jakub Kicinski <kuba(a)kernel.org> > [ split upstream __subflow_push_pending modification across __mptcp_push_pending and __mptcp_subflow_push_pending ] > Signed-off-by: Sasha Levin <sashal(a)kernel.org> > Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org> > --- > net/mptcp/protocol.c | 13 +++++-------- > net/mptcp/protocol.h | 2 +- > 2 files changed, 6 insertions(+), 9 deletions(-) > > --- a/net/mptcp/protocol.c > +++ b/net/mptcp/protocol.c > @@ -1137,7 +1137,7 @@ static void __mptcp_clean_una(struct soc > if (WARN_ON_ONCE(!msk->recovery)) > break; > > - WRITE_ONCE(msk->first_pending, mptcp_send_next(sk)); > + msk->first_pending = mptcp_send_next(sk); > } > > dfrag_clear(sk, dfrag); > @@ -1674,7 +1674,7 @@ void __mptcp_push_pending(struct sock *s > > mptcp_update_post_push(msk, dfrag, ret); > } > - WRITE_ONCE(msk->first_pending, mptcp_send_next(sk)); > + msk->first_pending = mptcp_send_next(sk); > } > > /* at this point we held the socket lock for the last subflow we used */ > @@ -1732,7 +1732,7 @@ static void __mptcp_subflow_push_pending > > mptcp_update_post_push(msk, dfrag, ret); > } > - WRITE_ONCE(msk->first_pending, mptcp_send_next(sk)); > + msk->first_pending = mptcp_send_next(sk); > } > > out: > @@ -1850,7 +1850,7 @@ static int mptcp_sendmsg(struct sock *sk > get_page(dfrag->page); > list_add_tail(&dfrag->list, &msk->rtx_queue); > if (!msk->first_pending) > - WRITE_ONCE(msk->first_pending, dfrag); > + msk->first_pending = dfrag; > } > pr_debug("msk=%p dfrag at seq=%llu len=%u sent=%u new=%d\n", msk, > dfrag->data_seq, dfrag->data_len, dfrag->already_sent, > @@ -2645,7 +2645,7 @@ static void __mptcp_clear_xmit(struct so > struct mptcp_sock *msk = mptcp_sk(sk); > struct mptcp_data_frag *dtmp, *dfrag; > > - WRITE_ONCE(msk->first_pending, NULL); > + msk->first_pending = NULL; > list_for_each_entry_safe(dfrag, dtmp, &msk->rtx_queue, list) > dfrag_clear(sk, dfrag); > } > @@ -3114,9 +3114,6 @@ void __mptcp_data_acked(struct sock *sk) > > void __mptcp_check_push(struct sock *sk, struct sock *ssk) > { > - if (!mptcp_send_head(sk)) > - return; > - > if (!sock_owned_by_user(sk)) { > struct sock *xmit_ssk = mptcp_subflow_get_send(mptcp_sk(sk)); > > --- a/net/mptcp/protocol.h > +++ b/net/mptcp/protocol.h > @@ -325,7 +325,7 @@ static inline struct mptcp_data_frag *mp > { > const struct mptcp_sock *msk = mptcp_sk(sk); > > - return READ_ONCE(msk->first_pending); > + return msk->first_pending; > } > > static inline struct mptcp_data_frag *mptcp_send_next(struct sock *sk) Cheers, Matt -- Sponsored by the NGI0 Core fund.

1 week, 1 day

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[PATCH] iommu/amd: Fix pci_segment memleak in alloc_pci_segment()

by Jinhui Guo

Fix a memory leak of struct amd_iommu_pci_segment in alloc_pci_segment() when system memory (or contiguous memory) is insufficient. Fixes: 04230c119930 ("iommu/amd: Introduce per PCI segment device table") Fixes: eda797a27795 ("iommu/amd: Introduce per PCI segment rlookup table") Fixes: 99fc4ac3d297 ("iommu/amd: Introduce per PCI segment alias_table") Cc: stable(a)vger.kernel.org Signed-off-by: Jinhui Guo <guojinhui.liam(a)bytedance.com> --- drivers/iommu/amd/init.c | 15 ++++++++++++--- 1 file changed, 12 insertions(+), 3 deletions(-) diff --git a/drivers/iommu/amd/init.c b/drivers/iommu/amd/init.c index ba9e582a8bbe..77afd5884984 100644 --- a/drivers/iommu/amd/init.c +++ b/drivers/iommu/amd/init.c @@ -1608,13 +1608,22 @@ static struct amd_iommu_pci_seg *__init alloc_pci_segment(u16 id, list_add_tail(&pci_seg->list, &amd_iommu_pci_seg_list); if (alloc_dev_table(pci_seg)) - return NULL; + goto err_free_pci_seg; if (alloc_alias_table(pci_seg)) - return NULL; + goto err_free_dev_table; if (alloc_rlookup_table(pci_seg)) - return NULL; + goto err_free_alias_table; return pci_seg; + +err_free_alias_table: + free_alias_table(pci_seg); +err_free_dev_table: + free_dev_table(pci_seg); +err_free_pci_seg: + list_del(&pci_seg->list); + kfree(pci_seg); + return NULL; } static struct amd_iommu_pci_seg *__init get_pci_segment(u16 id, -- 2.20.1

1 week, 1 day

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[PATCH] tty: serial: sh-sci: fix RSCI FIFO overrun handling

by Cosmin Tanislav

The receive error handling code is shared between RSCI and all other SCIF port types, but the RSCI overrun_reg is specified as a memory offset, while for other SCIF types it is an enum value used to index into the sci_port_params->regs array, as mentioned above the sci_serial_in() function. For RSCI, the overrun_reg is CSR (0x48), causing the sci_getreg() call inside the sci_handle_fifo_overrun() function to index outside the bounds of the regs array, which currently has a size of 20, as specified by SCI_NR_REGS. Because of this, we end up accessing memory outside of RSCI's rsci_port_params structure, which, when interpreted as a plat_sci_reg, happens to have a non-zero size, causing the following WARN when sci_serial_in() is called, as the accidental size does not match the supported register sizes. The existence of the overrun_reg needs to be checked because SCIx_SH3_SCIF_REGTYPE has overrun_reg set to SCLSR, but SCLSR is not present in the regs array. Avoid calling sci_getreg() for port types which don't use standard register handling. Use the ops->read_reg() and ops->write_reg() functions to properly read and write registers for RSCI, and change the type of the status variable to accommodate the 32-bit CSR register. sci_getreg() and sci_serial_in() are also called with overrun_reg in the sci_mpxed_interrupt() interrupt handler, but that code path is not used for RSCI, as it does not have a muxed interrupt. ------------[ cut here ]------------ Invalid register access WARNING: CPU: 0 PID: 0 at drivers/tty/serial/sh-sci.c:522 sci_serial_in+0x38/0xac Modules linked in: renesas_usbhs at24 rzt2h_adc industrialio_adc sha256 cfg80211 bluetooth ecdh_generic ecc rfkill fuse drm backlight ipv6 CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted 6.17.0-rc1+ #30 PREEMPT Hardware name: Renesas RZ/T2H EVK Board based on r9a09g077m44 (DT) pstate: 604000c5 (nZCv daIF +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : sci_serial_in+0x38/0xac lr : sci_serial_in+0x38/0xac sp : ffff800080003e80 x29: ffff800080003e80 x28: ffff800082195b80 x27: 000000000000000d x26: ffff8000821956d0 x25: 0000000000000000 x24: ffff800082195b80 x23: ffff000180e0d800 x22: 0000000000000010 x21: 0000000000000000 x20: 0000000000000010 x19: ffff000180e72000 x18: 000000000000000a x17: ffff8002bcee7000 x16: ffff800080000000 x15: 0720072007200720 x14: 0720072007200720 x13: 0720072007200720 x12: 0720072007200720 x11: 0000000000000058 x10: 0000000000000018 x9 : ffff8000821a6a48 x8 : 0000000000057fa8 x7 : 0000000000000406 x6 : ffff8000821fea48 x5 : ffff00033ef88408 x4 : ffff8002bcee7000 x3 : ffff800082195b80 x2 : 0000000000000000 x1 : 0000000000000000 x0 : ffff800082195b80 Call trace: sci_serial_in+0x38/0xac (P) sci_handle_fifo_overrun.isra.0+0x70/0x134 sci_er_interrupt+0x50/0x39c __handle_irq_event_percpu+0x48/0x140 handle_irq_event+0x44/0xb0 handle_fasteoi_irq+0xf4/0x1a0 handle_irq_desc+0x34/0x58 generic_handle_domain_irq+0x1c/0x28 gic_handle_irq+0x4c/0x140 call_on_irq_stack+0x30/0x48 do_interrupt_handler+0x80/0x84 el1_interrupt+0x34/0x68 el1h_64_irq_handler+0x18/0x24 el1h_64_irq+0x6c/0x70 default_idle_call+0x28/0x58 (P) do_idle+0x1f8/0x250 cpu_startup_entry+0x34/0x3c rest_init+0xd8/0xe0 console_on_rootfs+0x0/0x6c __primary_switched+0x88/0x90 ---[ end trace 0000000000000000 ]--- Cc: stable(a)vger.kernel.org Fixes: 0666e3fe95ab ("serial: sh-sci: Add support for RZ/T2H SCI") Signed-off-by: Cosmin Tanislav <cosmin-gabriel.tanislav.xa(a)renesas.com> --- drivers/tty/serial/sh-sci.c | 14 ++++++++------ 1 file changed, 8 insertions(+), 6 deletions(-) diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c index 538b2f991609..62bb62b82cbe 100644 --- a/drivers/tty/serial/sh-sci.c +++ b/drivers/tty/serial/sh-sci.c @@ -1014,16 +1014,18 @@ static int sci_handle_fifo_overrun(struct uart_port *port) struct sci_port *s = to_sci_port(port); const struct plat_sci_reg *reg; int copied = 0; - u16 status; + u32 status; - reg = sci_getreg(port, s->params->overrun_reg); - if (!reg->size) - return 0; + if (s->type != SCI_PORT_RSCI) { + reg = sci_getreg(port, s->params->overrun_reg); + if (!reg->size) + return 0; + } - status = sci_serial_in(port, s->params->overrun_reg); + status = s->ops->read_reg(port, s->params->overrun_reg); if (status & s->params->overrun_mask) { status &= ~s->params->overrun_mask; - sci_serial_out(port, s->params->overrun_reg, status); + s->ops->write_reg(port, s->params->overrun_reg, status); port->icount.overrun++; -- 2.51.0

1 week, 1 day

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[PATCH v5] block: Remove queue freezing from several sysfs store callbacks

by Bart Van Assche

Freezing the request queue from inside sysfs store callbacks may cause a deadlock in combination with the dm-multipath driver and the queue_if_no_path option. Additionally, freezing the request queue slows down system boot on systems where sysfs attributes are set synchronously. Fix this by removing the blk_mq_freeze_queue() / blk_mq_unfreeze_queue() calls from the store callbacks that do not strictly need these callbacks. This patch may cause a small delay in applying the new settings. This patch affects the following sysfs attributes: * io_poll_delay * io_timeout * nomerges * read_ahead_kb * rq_affinity Here is an example of a deadlock triggered by running test srp/002: task:multipathd Call Trace: <TASK> __schedule+0x8c1/0x1bf0 schedule+0xdd/0x270 schedule_preempt_disabled+0x1c/0x30 __mutex_lock+0xb89/0x1650 mutex_lock_nested+0x1f/0x30 dm_table_set_restrictions+0x823/0xdf0 __bind+0x166/0x590 dm_swap_table+0x2a7/0x490 do_resume+0x1b1/0x610 dev_suspend+0x55/0x1a0 ctl_ioctl+0x3a5/0x7e0 dm_ctl_ioctl+0x12/0x20 __x64_sys_ioctl+0x127/0x1a0 x64_sys_call+0xe2b/0x17d0 do_syscall_64+0x96/0x3a0 entry_SYSCALL_64_after_hwframe+0x4b/0x53 </TASK> task:(udev-worker) Call Trace: <TASK> __schedule+0x8c1/0x1bf0 schedule+0xdd/0x270 blk_mq_freeze_queue_wait+0xf2/0x140 blk_mq_freeze_queue_nomemsave+0x23/0x30 queue_ra_store+0x14e/0x290 queue_attr_store+0x23e/0x2c0 sysfs_kf_write+0xde/0x140 kernfs_fop_write_iter+0x3b2/0x630 vfs_write+0x4fd/0x1390 ksys_write+0xfd/0x230 __x64_sys_write+0x76/0xc0 x64_sys_call+0x276/0x17d0 do_syscall_64+0x96/0x3a0 entry_SYSCALL_64_after_hwframe+0x4b/0x53 </TASK> Cc: Christoph Hellwig <hch(a)lst.de> Cc: Ming Lei <ming.lei(a)redhat.com> Cc: Nilay Shroff <nilay(a)linux.ibm.com> Cc: Martin Wilck <mwilck(a)suse.com> Cc: Benjamin Marzinski <bmarzins(a)redhat.com> Cc: stable(a)vger.kernel.org Fixes: af2814149883 ("block: freeze the queue in queue_attr_store") Signed-off-by: Bart Van Assche <bvanassche(a)acm.org> --- Changes compared to v4: - Use WRITE_ONCE() to update bdi->ra_pages. - Move a data_race() annotation from queue_io_timeout_store() into blk_queue_rq_timeout(). Changes compared to v3: - Added two data_race() annotations. Changes compared to v2: - Dropped the controversial patch "block: Restrict the duration of sysfs attribute changes". Changes compared to v1: - Added patch "block: Restrict the duration of sysfs attribute changes". - Remove queue freezing from more sysfs callbacks. block/blk-settings.c | 9 ++++++++- block/blk-sysfs.c | 30 ++++++++++++------------------ 2 files changed, 20 insertions(+), 19 deletions(-) diff --git a/block/blk-settings.c b/block/blk-settings.c index 78dfef117623..b5587cc535e5 100644 --- a/block/blk-settings.c +++ b/block/blk-settings.c @@ -23,7 +23,14 @@ void blk_queue_rq_timeout(struct request_queue *q, unsigned int timeout) { - WRITE_ONCE(q->rq_timeout, timeout); + /* + * Use WRITE_ONCE() to write q->rq_timeout once. Use data_race() to + * suppress KCSAN race reports against the write below. + */ + data_race(({ + WRITE_ONCE(q->rq_timeout, timeout); + 0; + })); } EXPORT_SYMBOL_GPL(blk_queue_rq_timeout); diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c index 76c47fe9b8d6..99e78d907c1c 100644 --- a/block/blk-sysfs.c +++ b/block/blk-sysfs.c @@ -143,21 +143,26 @@ queue_ra_store(struct gendisk *disk, const char *page, size_t count) { unsigned long ra_kb; ssize_t ret; - unsigned int memflags; struct request_queue *q = disk->queue; ret = queue_var_store(&ra_kb, page, count); if (ret < 0) return ret; /* - * ->ra_pages is protected by ->limits_lock because it is usually - * calculated from the queue limits by queue_limits_commit_update. + * The ->ra_pages change below is protected by ->limits_lock because it + * is usually calculated from the queue limits by + * queue_limits_commit_update(). + * + * bdi->ra_pages reads are not serialized against bdi->ra_pages writes. + * Use WRITE_ONCE() to write bdi->ra_pages once. Use data_race() to + * suppress KCSAN race reports against the write below. */ mutex_lock(&q->limits_lock); - memflags = blk_mq_freeze_queue(q); - disk->bdi->ra_pages = ra_kb >> (PAGE_SHIFT - 10); + data_race(({ + WRITE_ONCE(disk->bdi->ra_pages, ra_kb >> (PAGE_SHIFT - 10)); + 0; + })); mutex_unlock(&q->limits_lock); - blk_mq_unfreeze_queue(q, memflags); return ret; } @@ -375,21 +380,18 @@ static ssize_t queue_nomerges_store(struct gendisk *disk, const char *page, size_t count) { unsigned long nm; - unsigned int memflags; struct request_queue *q = disk->queue; ssize_t ret = queue_var_store(&nm, page, count); if (ret < 0) return ret; - memflags = blk_mq_freeze_queue(q); blk_queue_flag_clear(QUEUE_FLAG_NOMERGES, q); blk_queue_flag_clear(QUEUE_FLAG_NOXMERGES, q); if (nm == 2) blk_queue_flag_set(QUEUE_FLAG_NOMERGES, q); else if (nm) blk_queue_flag_set(QUEUE_FLAG_NOXMERGES, q); - blk_mq_unfreeze_queue(q, memflags); return ret; } @@ -409,7 +411,6 @@ queue_rq_affinity_store(struct gendisk *disk, const char *page, size_t count) #ifdef CONFIG_SMP struct request_queue *q = disk->queue; unsigned long val; - unsigned int memflags; ret = queue_var_store(&val, page, count); if (ret < 0) @@ -421,7 +422,6 @@ queue_rq_affinity_store(struct gendisk *disk, const char *page, size_t count) * are accessed individually using atomic test_bit operation. So we * don't grab any lock while updating these flags. */ - memflags = blk_mq_freeze_queue(q); if (val == 2) { blk_queue_flag_set(QUEUE_FLAG_SAME_COMP, q); blk_queue_flag_set(QUEUE_FLAG_SAME_FORCE, q); @@ -432,7 +432,6 @@ queue_rq_affinity_store(struct gendisk *disk, const char *page, size_t count) blk_queue_flag_clear(QUEUE_FLAG_SAME_COMP, q); blk_queue_flag_clear(QUEUE_FLAG_SAME_FORCE, q); } - blk_mq_unfreeze_queue(q, memflags); #endif return ret; } @@ -446,11 +445,9 @@ static ssize_t queue_poll_delay_store(struct gendisk *disk, const char *page, static ssize_t queue_poll_store(struct gendisk *disk, const char *page, size_t count) { - unsigned int memflags; ssize_t ret = count; struct request_queue *q = disk->queue; - memflags = blk_mq_freeze_queue(q); if (!(q->limits.features & BLK_FEAT_POLL)) { ret = -EINVAL; goto out; @@ -459,7 +456,6 @@ static ssize_t queue_poll_store(struct gendisk *disk, const char *page, pr_info_ratelimited("writes to the poll attribute are ignored.\n"); pr_info_ratelimited("please use driver specific parameters instead.\n"); out: - blk_mq_unfreeze_queue(q, memflags); return ret; } @@ -472,7 +468,7 @@ static ssize_t queue_io_timeout_show(struct gendisk *disk, char *page) static ssize_t queue_io_timeout_store(struct gendisk *disk, const char *page, size_t count) { - unsigned int val, memflags; + unsigned int val; int err; struct request_queue *q = disk->queue; @@ -480,9 +476,7 @@ static ssize_t queue_io_timeout_store(struct gendisk *disk, const char *page, if (err || val == 0) return -EINVAL; - memflags = blk_mq_freeze_queue(q); blk_queue_rq_timeout(q, msecs_to_jiffies(val)); - blk_mq_unfreeze_queue(q, memflags); return count; }

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[PATCH v2] ASoC: Intel: avs: Fix potential buffer overflow by snprintf()

by hariconscious＠gmail.com

From: HariKrishna Sagala <hariconscious(a)gmail.com> snprintf() returns the would-be-filled size when the string overflows the given buffer size, hence using this value may result in a buffer overflow (although it's unrealistic). This patch replaces it with a safer version, scnprintf() for papering over such a potential issue. Link: https://github.com/KSPP/linux/issues/105 'Fixes: 5a565ba23abe ("ASoC: Intel: avs: Probing and firmware tracing over debugfs")' Signed-off-by: HariKrishna Sagala <hariconscious(a)gmail.com> --- Thank you for the feedback and the suggestions. Corrected the indentation & commit message. V1: https://lore.kernel.org/all/20251112120235.54328-2-hariconscious@gmail.com/ sound/soc/intel/avs/debugfs.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/sound/soc/intel/avs/debugfs.c b/sound/soc/intel/avs/debugfs.c index 3534de46f9e4..cdb82392b9ee 100644 --- a/sound/soc/intel/avs/debugfs.c +++ b/sound/soc/intel/avs/debugfs.c @@ -119,9 +119,9 @@ static ssize_t probe_points_read(struct file *file, char __user *to, size_t coun } for (i = 0; i < num_desc; i++) { - ret = snprintf(buf + len, PAGE_SIZE - len, - "Id: %#010x Purpose: %d Node id: %#x\n", - desc[i].id.value, desc[i].purpose, desc[i].node_id.val); + ret = scnprintf(buf + len, PAGE_SIZE - len, + "Id: %#010x Purpose: %d Node id: %#x\n", + desc[i].id.value, desc[i].purpose, desc[i].node_id.val); if (ret < 0) goto free_desc; len += ret; base-commit: 24172e0d79900908cf5ebf366600616d29c9b417 -- 2.43.0

1 week, 1 day

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Re:Good day,

by Harry Schofield ESQ

Re:Good day, Hope you are well, my first email returned undelivered, please can I provide you with more information through this email?. Best regards, Harry Schofield

1 week, 1 day

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[PATCH v2] leds: leds-lp50xx: enable chip before any communication

by Christian Hitz

From: Christian Hitz <christian.hitz(a)bbv.ch> If a GPIO is used to control the chip's enable pin, it needs to be pulled high before any i2c communication is attempted. Currently, the enable GPIO handling is not correct. Assume the enable GPIO is low when the probe function is entered. In this case the device is in SHUTDOWN mode and does not react to i2c commands. During probe the following sequence happens: 1. The call to lp50xx_reset() on line 548 has no effect as i2c is not possible yet. 2. Then - on line 552 - lp50xx_enable_disable() is called. As "priv->enable_gpio“ has not yet been initialized, setting the GPIO has no effect. Also the i2c enable command is not executed as the device is still in SHUTDOWN. 3. On line 556 the call to lp50xx_probe_dt() finally parses the rest of the DT and the configured priv->enable_gpio is set up. As a result the device is still in SHUTDOWN mode and not ready for operation. Split lp50xx_enable_disable() into distinct enable and disable functions to enforce correct ordering between enable_gpio manipulations and i2c commands. Read enable_gpio configuration from DT before attempting to manipulate enable_gpio. Add delays to observe correct wait timing after manipulating enable_gpio and before any i2c communication. Fixes: 242b81170fb8 ("leds: lp50xx: Add the LP50XX family of the RGB LED driver") Cc: stable(a)vger.kernel.org Signed-off-by: Christian Hitz <christian.hitz(a)bbv.ch> --- Changes in v2: - Unconditionally reset in lp50xx_enable - Define magic numbers - Improve log message --- drivers/leds/leds-lp50xx.c | 55 +++++++++++++++++++++++++++----------- 1 file changed, 40 insertions(+), 15 deletions(-) diff --git a/drivers/leds/leds-lp50xx.c b/drivers/leds/leds-lp50xx.c index 94f8ef6b482c..d3485d814cf4 100644 --- a/drivers/leds/leds-lp50xx.c +++ b/drivers/leds/leds-lp50xx.c @@ -50,6 +50,12 @@ #define LP50XX_SW_RESET 0xff #define LP50XX_CHIP_EN BIT(6) +#define LP50XX_CHIP_DISABLE 0x00 +#define LP50XX_START_TIME_US 500 +#define LP50XX_RESET_TIME_US 3 + +#define LP50XX_EN_GPIO_LOW 0 +#define LP50XX_EN_GPIO_HIGH 1 /* There are 3 LED outputs per bank */ #define LP50XX_LEDS_PER_MODULE 3 @@ -371,19 +377,42 @@ static int lp50xx_reset(struct lp50xx *priv) return regmap_write(priv->regmap, priv->chip_info->reset_reg, LP50XX_SW_RESET); } -static int lp50xx_enable_disable(struct lp50xx *priv, int enable_disable) +static int lp50xx_enable(struct lp50xx *priv) { int ret; - ret = gpiod_direction_output(priv->enable_gpio, enable_disable); + if (priv->enable_gpio) { + ret = gpiod_direction_output(priv->enable_gpio, LP50XX_EN_GPIO_HIGH); + if (ret) + return ret; + + udelay(LP50XX_START_TIME_US); + } + + ret = lp50xx_reset(priv); if (ret) return ret; - if (enable_disable) - return regmap_write(priv->regmap, LP50XX_DEV_CFG0, LP50XX_CHIP_EN); - else - return regmap_write(priv->regmap, LP50XX_DEV_CFG0, 0); + return regmap_write(priv->regmap, LP50XX_DEV_CFG0, LP50XX_CHIP_EN); +} +static int lp50xx_disable(struct lp50xx *priv) +{ + int ret; + + ret = regmap_write(priv->regmap, LP50XX_DEV_CFG0, LP50XX_CHIP_DISABLE); + if (ret) + return ret; + + if (priv->enable_gpio) { + ret = gpiod_direction_output(priv->enable_gpio, LP50XX_EN_GPIO_LOW); + if (ret) + return ret; + + udelay(LP50XX_RESET_TIME_US); + } + + return 0; } static int lp50xx_probe_leds(struct fwnode_handle *child, struct lp50xx *priv, @@ -447,6 +476,10 @@ static int lp50xx_probe_dt(struct lp50xx *priv) return dev_err_probe(priv->dev, PTR_ERR(priv->enable_gpio), "Failed to get enable GPIO\n"); + ret = lp50xx_enable(priv); + if (ret) + return ret; + priv->regulator = devm_regulator_get(priv->dev, "vled"); if (IS_ERR(priv->regulator)) priv->regulator = NULL; @@ -547,14 +580,6 @@ static int lp50xx_probe(struct i2c_client *client) return ret; } - ret = lp50xx_reset(led); - if (ret) - return ret; - - ret = lp50xx_enable_disable(led, 1); - if (ret) - return ret; - return lp50xx_probe_dt(led); } @@ -563,7 +588,7 @@ static void lp50xx_remove(struct i2c_client *client) struct lp50xx *led = i2c_get_clientdata(client); int ret; - ret = lp50xx_enable_disable(led, 0); + ret = lp50xx_disable(led); if (ret) dev_err(led->dev, "Failed to disable chip\n"); -- 2.51.1

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