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Need LDI 2025 Business Contacts

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4 days, 6 hours

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[PATCH v1] xhci: dbgtty: fix device unregister

by Łukasz Bartosik

From: Łukasz Bartosik <ukaszb(a)chromium.org> When DbC is disconnected then xhci_dbc_tty_unregister_device() is called. However if there is any user space process blocked on write to DbC terminal device then it will never be signalled and thus stay blocked indifinitely. This fix adds a tty_hangup() call in xhci_dbc_tty_unregister_device(). The tty_hangup() wakes up any blocked writers and causes subsequent write attempts to DbC terminal device to fail. Cc: stable(a)vger.kernel.org Fixes: dfba2174dc42 ("usb: xhci: Add DbC support in xHCI driver") Signed-off-by: Łukasz Bartosik <ukaszb(a)chromium.org> --- drivers/usb/host/xhci-dbgtty.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/usb/host/xhci-dbgtty.c b/drivers/usb/host/xhci-dbgtty.c index d894081d8d15..6ea31af576c7 100644 --- a/drivers/usb/host/xhci-dbgtty.c +++ b/drivers/usb/host/xhci-dbgtty.c @@ -535,6 +535,13 @@ static void xhci_dbc_tty_unregister_device(struct xhci_dbc *dbc) if (!port->registered) return; + /* + * Hang up the TTY. This wakes up any blocked + * writers and causes subsequent writes to fail. + */ + if (port->port.tty) + tty_hangup(port->port.tty); + tty_unregister_device(dbc_tty_driver, port->minor); xhci_dbc_tty_exit_port(port); port->registered = false; -- 2.52.0.rc1.455.g30608eb744-goog

4 days, 6 hours

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[BUG] Missing backport for commit b441cf3f8c4b ("xfrm: delete x->tunnel as we delete x")

by Slavin Liu

Hi, I would like to request backporting commit b441cf3f8c4b ("xfrm: delete x->tunnel as we delete x") to all LTS kernels. This patch actually fixes a use-after-free issue, but it hasn't been backported to any of the LTS versions, which are still being affected. As the patch describes, a specific trigger scenario could be: If a tunnel packet is received (e.g., in ip_local_deliver()), with the outer layer being IPComp protocol and the inner layer being fragmented packets, during outer packet processing, it will go through xfrm_input() to hold a reference to the IPComp xfrm_state. Then, it is re-injected into the network stack via gro_cells_receive() and placed in the reassembly queue. When exiting the netns and calling cleanup_net(), although ipv4_frags_exit_net() is called before xfrm_net_exit(), due to asynchronous scheduling, fqdir_free_work() may execute after xfrm_state_fini(). In xfrm_state_fini(), xfrm_state_flush() puts and deletes the xfrm_state for IPPROTO_COMP, but does not delete the xfrm_state for IPPROTO_IPIP. Meanwhile, the skb in the reassembly queue holds the last reference to the IPPROTO_COMP xfrm_state, so it isn't destroyed yet. Only when the skb in the reassembly queue is destroyed does the IPPROTO_COMP xfrm_state get fully destroyed, which calls ipcomp_destroy() to delete the IPPROTO_IPIP xfrm_state. However, by this time, the hash tables (net->xfrm.state_byxxx) have already been kfreed in xfrm_state_fini(), leading to a use-after-free during the deletion. The bug has existed since kernel v2.6.29, so the patch should be backported to all LTS kernels. thanks, Slavin Liu

4 days, 6 hours

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[PATCH 08/15] dmaengine: sh: rz-dmac: fix device leak on probe failure

by Johan Hovold

Make sure to drop the reference taken when looking up the ICU device during probe also on probe failures (e.g. probe deferral). Fixes: 7de873201c44 ("dmaengine: sh: rz-dmac: Add RZ/V2H(P) support") Cc: stable(a)vger.kernel.org # 6.16 Cc: Fabrizio Castro <fabrizio.castro.jz(a)renesas.com> Signed-off-by: Johan Hovold <johan(a)kernel.org> --- drivers/dma/sh/rz-dmac.c | 13 +++++++++++-- 1 file changed, 11 insertions(+), 2 deletions(-) diff --git a/drivers/dma/sh/rz-dmac.c b/drivers/dma/sh/rz-dmac.c index 1f687b08d6b8..38137e8d80b9 100644 --- a/drivers/dma/sh/rz-dmac.c +++ b/drivers/dma/sh/rz-dmac.c @@ -854,6 +854,13 @@ static int rz_dmac_chan_probe(struct rz_dmac *dmac, return 0; } +static void rz_dmac_put_device(void *_dev) +{ + struct device *dev = _dev; + + put_device(dev); +} + static int rz_dmac_parse_of_icu(struct device *dev, struct rz_dmac *dmac) { struct device_node *np = dev->of_node; @@ -876,6 +883,10 @@ static int rz_dmac_parse_of_icu(struct device *dev, struct rz_dmac *dmac) return -ENODEV; } + ret = devm_add_action_or_reset(dev, rz_dmac_put_device, &dmac->icu.pdev->dev); + if (ret) + return ret; + dmac_index = args.args[0]; if (dmac_index > RZV2H_MAX_DMAC_INDEX) { dev_err(dev, "DMAC index %u invalid.\n", dmac_index); @@ -1055,8 +1066,6 @@ static void rz_dmac_remove(struct platform_device *pdev) reset_control_assert(dmac->rstc); pm_runtime_put(&pdev->dev); pm_runtime_disable(&pdev->dev); - - platform_device_put(dmac->icu.pdev); } static const struct of_device_id of_rz_dmac_match[] = { -- 2.51.0

4 days, 8 hours

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[RFC WIP 1/3] rust: list: Add unsafe for container_of

by Philipp Stanner

impl_list_item_mod.rs calls container_of() without unsafe blocks at a couple of places. Since container_of() is an unsafe macro / function, the blocks are strictly necessary. For unknown reasons, that problem was so far not visible and only gets visible once one utilizes the list implementation from within the core crate: error[E0133]: call to unsafe function `core::ptr::mut_ptr::<impl *mut T>::byte_sub` is unsafe and requires unsafe block --> rust/kernel/lib.rs:252:29 | 252 | let container_ptr = field_ptr.byte_sub(offset).cast::<$Container>(); | ^^^^^^^^^^^^^^^^^^^^^^^^^^ call to unsafe function | ::: rust/kernel/drm/jq.rs:98:1 | 98 | / impl_list_item! { 99 | | impl ListItem<0> for BasicItem { using ListLinks { self.links }; } 100 | | } | |_- in this macro invocation | note: an unsafe function restricts its caller, but its body is safe by default --> rust/kernel/list/impl_list_item_mod.rs:216:13 | 216 | unsafe fn view_value(me: *mut $crate::list::ListLinks<$num>) -> *const Self { | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | ::: rust/kernel/drm/jq.rs:98:1 | 98 | / impl_list_item! { 99 | | impl ListItem<0> for BasicItem { using ListLinks { self.links }; } 100 | | } | |_- in this macro invocation = note: requested on the command line with `-D unsafe-op-in-unsafe-fn` = note: this error originates in the macro `$crate::container_of` which comes from the expansion of the macro `impl_list_item` Add unsafe blocks to container_of to fix the issue. Cc: stable(a)vger.kernel.org # v6.17+ Fixes: c77f85b347dd ("rust: list: remove OFFSET constants") Suggested-by: Alice Ryhl <aliceryhl(a)google.com> Signed-off-by: Philipp Stanner <phasta(a)kernel.org> --- rust/kernel/list/impl_list_item_mod.rs | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) diff --git a/rust/kernel/list/impl_list_item_mod.rs b/rust/kernel/list/impl_list_item_mod.rs index 202bc6f97c13..7052095efde5 100644 --- a/rust/kernel/list/impl_list_item_mod.rs +++ b/rust/kernel/list/impl_list_item_mod.rs @@ -217,7 +217,7 @@ unsafe fn view_value(me: *mut $crate::list::ListLinks<$num>) -> *const Self { // SAFETY: `me` originates from the most recent call to `prepare_to_insert`, so it // points at the field `$field` in a value of type `Self`. Thus, reversing that // operation is still in-bounds of the allocation. - $crate::container_of!(me, Self, $($field).*) + unsafe { $crate::container_of!(me, Self, $($field).*) } } // GUARANTEES: @@ -242,7 +242,7 @@ unsafe fn post_remove(me: *mut $crate::list::ListLinks<$num>) -> *const Self { // SAFETY: `me` originates from the most recent call to `prepare_to_insert`, so it // points at the field `$field` in a value of type `Self`. Thus, reversing that // operation is still in-bounds of the allocation. - $crate::container_of!(me, Self, $($field).*) + unsafe { $crate::container_of!(me, Self, $($field).*) } } } )*}; @@ -270,9 +270,9 @@ unsafe fn prepare_to_insert(me: *const Self) -> *mut $crate::list::ListLinks<$nu // SAFETY: The caller promises that `me` points at a valid value of type `Self`. let links_field = unsafe { <Self as $crate::list::ListItem<$num>>::view_links(me) }; - let container = $crate::container_of!( + let container = unsafe { $crate::container_of!( links_field, $crate::list::ListLinksSelfPtr<Self, $num>, inner - ); + ) }; // SAFETY: By the same reasoning above, `links_field` is a valid pointer. let self_ptr = unsafe { @@ -319,9 +319,9 @@ unsafe fn view_links(me: *const Self) -> *mut $crate::list::ListLinks<$num> { // `ListArc` containing `Self` until the next call to `post_remove`. The value cannot // be destroyed while a `ListArc` reference exists. unsafe fn view_value(links_field: *mut $crate::list::ListLinks<$num>) -> *const Self { - let container = $crate::container_of!( + let container = unsafe { $crate::container_of!( links_field, $crate::list::ListLinksSelfPtr<Self, $num>, inner - ); + ) }; // SAFETY: By the same reasoning above, `links_field` is a valid pointer. let self_ptr = unsafe { -- 2.49.0

4 days, 8 hours

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[PATCH] drm/amd: Skip power ungate during suspend for VPE

by Mario Limonciello

From: "Mario Limonciello (AMD)" <superm1(a)kernel.org> During the suspend sequence VPE is already going to be power gated as part of vpe_suspend(). It's unnecessary to call during calls to amdgpu_device_set_pg_state(). It actually can expose a race condition with the firmware if s0i3 sequence starts as well. Drop these calls. Cc: stable(a)vger.kernel.org Cc: Peyton.Lee(a)amd.com Signed-off-by: Mario Limonciello <mario.limonciello(a)amd.com> --- drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c index 81587f8d66c2..22db0e4154e4 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c @@ -3419,10 +3419,11 @@ int amdgpu_device_set_pg_state(struct amdgpu_device *adev, (adev->ip_blocks[i].version->type == AMD_IP_BLOCK_TYPE_GFX || adev->ip_blocks[i].version->type == AMD_IP_BLOCK_TYPE_SDMA)) continue; - /* skip CG for VCE/UVD, it's handled specially */ + /* skip CG for VCE/UVD/VPE, it's handled specially */ if (adev->ip_blocks[i].version->type != AMD_IP_BLOCK_TYPE_UVD && adev->ip_blocks[i].version->type != AMD_IP_BLOCK_TYPE_VCE && adev->ip_blocks[i].version->type != AMD_IP_BLOCK_TYPE_VCN && + adev->ip_blocks[i].version->type != AMD_IP_BLOCK_TYPE_VPE && adev->ip_blocks[i].version->type != AMD_IP_BLOCK_TYPE_JPEG && adev->ip_blocks[i].version->funcs->set_powergating_state) { /* enable powergating to save power */ -- 2.51.2

4 days, 8 hours

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[PATCH] can: rcar_canfd: Fix CAN-FD mode as default

by Biju

From: Biju Das <biju.das.jz(a)bp.renesas.com> The commit 5cff263606a1 ("can: rcar_canfd: Fix controller mode setting") has aligned with the flow mentioned in the hardware manual for all SoCs except R-Car Gen3 and RZ/G2L SoCs. On R-Car Gen4 and RZ/G3E SoCs, due to the wrong logic in the commit[1] sets the default mode to FD-Only mode instead of CAN-FD mode. This patch sets the CAN-FD mode as the default for all SoCs by dropping the rcar_canfd_set_mode() as some SoC requires mode setting in global reset mode, and the rest of the SoCs in channel reset mode and update the rcar_canfd_reset_controller() to take care of these constraints. Moreover, the RZ/G3E and R-Car Gen4 SoCs support 3 modes compared to 2 modes on the R-Car Gen3. Use inverted logic in rcar_canfd_reset_controller() to simplify the code later to support FD-only mode. [1] commit 45721c406dcf ("can: rcar_canfd: Add support for r8a779a0 SoC") Fixes: 5cff263606a1 ("can: rcar_canfd: Fix controller mode setting") Cc: stable(a)vger.kernel.org Signed-off-by: Biju Das <biju.das.jz(a)bp.renesas.com> --- drivers/net/can/rcar/rcar_canfd.c | 53 ++++++++++++++++++------------- 1 file changed, 31 insertions(+), 22 deletions(-) diff --git a/drivers/net/can/rcar/rcar_canfd.c b/drivers/net/can/rcar/rcar_canfd.c index 49ab65274b51..05dbdf46dd6f 100644 --- a/drivers/net/can/rcar/rcar_canfd.c +++ b/drivers/net/can/rcar/rcar_canfd.c @@ -709,6 +709,11 @@ static void rcar_canfd_set_bit_reg(void __iomem *addr, u32 val) rcar_canfd_update(val, val, addr); } +static void rcar_canfd_clear_bit_reg(void __iomem *addr, u32 val) +{ + rcar_canfd_update(val, 0, addr); +} + static void rcar_canfd_update_bit_reg(void __iomem *addr, u32 mask, u32 val) { rcar_canfd_update(mask, val, addr); @@ -755,25 +760,6 @@ static void rcar_canfd_set_rnc(struct rcar_canfd_global *gpriv, unsigned int ch, rcar_canfd_set_bit(gpriv->base, RCANFD_GAFLCFG(w), rnc); } -static void rcar_canfd_set_mode(struct rcar_canfd_global *gpriv) -{ - if (gpriv->info->ch_interface_mode) { - u32 ch, val = gpriv->fdmode ? RCANFD_GEN4_FDCFG_FDOE - : RCANFD_GEN4_FDCFG_CLOE; - - for_each_set_bit(ch, &gpriv->channels_mask, - gpriv->info->max_channels) - rcar_canfd_set_bit_reg(&gpriv->fcbase[ch].cfdcfg, val); - } else { - if (gpriv->fdmode) - rcar_canfd_set_bit(gpriv->base, RCANFD_GRMCFG, - RCANFD_GRMCFG_RCMC); - else - rcar_canfd_clear_bit(gpriv->base, RCANFD_GRMCFG, - RCANFD_GRMCFG_RCMC); - } -} - static int rcar_canfd_reset_controller(struct rcar_canfd_global *gpriv) { struct device *dev = &gpriv->pdev->dev; @@ -806,6 +792,16 @@ static int rcar_canfd_reset_controller(struct rcar_canfd_global *gpriv) /* Reset Global error flags */ rcar_canfd_write(gpriv->base, RCANFD_GERFL, 0x0); + /* Set the controller into appropriate mode */ + if (!gpriv->info->ch_interface_mode) { + if (gpriv->fdmode) + rcar_canfd_set_bit(gpriv->base, RCANFD_GRMCFG, + RCANFD_GRMCFG_RCMC); + else + rcar_canfd_clear_bit(gpriv->base, RCANFD_GRMCFG, + RCANFD_GRMCFG_RCMC); + } + /* Transition all Channels to reset mode */ for_each_set_bit(ch, &gpriv->channels_mask, gpriv->info->max_channels) { rcar_canfd_clear_bit(gpriv->base, @@ -823,10 +819,23 @@ static int rcar_canfd_reset_controller(struct rcar_canfd_global *gpriv) dev_dbg(dev, "channel %u reset failed\n", ch); return err; } - } - /* Set the controller into appropriate mode */ - rcar_canfd_set_mode(gpriv); + /* Set the controller into appropriate mode */ + if (gpriv->info->ch_interface_mode) { + /* Do not set CLOE and FDOE simultaneously */ + if (!gpriv->fdmode) { + rcar_canfd_clear_bit_reg(&gpriv->fcbase[ch].cfdcfg, + RCANFD_GEN4_FDCFG_FDOE); + rcar_canfd_set_bit_reg(&gpriv->fcbase[ch].cfdcfg, + RCANFD_GEN4_FDCFG_CLOE); + } else { + rcar_canfd_clear_bit_reg(&gpriv->fcbase[ch].cfdcfg, + RCANFD_GEN4_FDCFG_FDOE); + rcar_canfd_clear_bit_reg(&gpriv->fcbase[ch].cfdcfg, + RCANFD_GEN4_FDCFG_CLOE); + } + } + } return 0; } -- 2.43.0

4 days, 9 hours

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[PATCH v2] drm/xe/oa: Fix potential UAF in xe_oa_add_config_ioctl()

by Sanjay Yadav

In xe_oa_add_config_ioctl(), we accessed oa_config->id after dropping metrics_lock. Since this lock protects the lifetime of oa_config, an attacker could guess the id and call xe_oa_remove_config_ioctl() with perfect timing, freeing oa_config before we dereference it, leading to a potential use-after-free. Fix this by caching the id in a local variable while holding the lock. v2: (Matt A) - Dropped mutex_unlock(&oa->metrics_lock) ordering change from xe_oa_remove_config_ioctl() Closes: https://gitlab.freedesktop.org/drm/xe/kernel/-/issues/6614 Fixes: cdf02fe1a94a7 ("drm/xe/oa/uapi: Add/remove OA config perf ops") Cc: <stable(a)vger.kernel.org> # v6.11+ Suggested-by: Matthew Auld <matthew.auld(a)intel.com> Signed-off-by: Sanjay Yadav <sanjay.kumar.yadav(a)intel.com> --- drivers/gpu/drm/xe/xe_oa.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/xe/xe_oa.c b/drivers/gpu/drm/xe/xe_oa.c index 87a2bf53d661..890c363282ae 100644 --- a/drivers/gpu/drm/xe/xe_oa.c +++ b/drivers/gpu/drm/xe/xe_oa.c @@ -2403,11 +2403,13 @@ int xe_oa_add_config_ioctl(struct drm_device *dev, u64 data, struct drm_file *fi goto sysfs_err; } - mutex_unlock(&oa->metrics_lock); + id = oa_config->id; + + drm_dbg(&oa->xe->drm, "Added config %s id=%i\n", oa_config->uuid, id); - drm_dbg(&oa->xe->drm, "Added config %s id=%i\n", oa_config->uuid, oa_config->id); + mutex_unlock(&oa->metrics_lock); - return oa_config->id; + return id; sysfs_err: mutex_unlock(&oa->metrics_lock); -- 2.43.0

4 days, 9 hours

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Re: [PATCH] unshare: Fix nsproxy leak on set_cred_ucounts() error path

by Alexey Gladkov

On Tue, Nov 18, 2025 at 02:45:50PM +0800, Pavel Tikhomirov wrote: > If unshare_nsproxy_namespaces() successfully creates the new_nsproxy, > but then set_cred_ucounts() fails, on its error path there is no cleanup > for new_nsproxy, so it is leaked. Let's fix that by freeing new_nsproxy > if it's not NULL on this error path. > > Fixes: 905ae01c4ae2a ("Add a reference to ucounts for each cred") > Signed-off-by: Pavel Tikhomirov <ptikhomirov(a)virtuozzo.com> Cc: stable(a)vger.kernel.org Acked-by: Alexey Gladkov <legion(a)kernel.org> > --- > kernel/fork.c | 5 ++++- > 1 file changed, 4 insertions(+), 1 deletion(-) > > diff --git a/kernel/fork.c b/kernel/fork.c > index 3da0f08615a95..6f7332e3e0c8c 100644 > --- a/kernel/fork.c > +++ b/kernel/fork.c > @@ -3133,8 +3133,11 @@ int ksys_unshare(unsigned long unshare_flags) > > if (new_cred) { > err = set_cred_ucounts(new_cred); > - if (err) > + if (err) { > + if (new_nsproxy) > + free_nsproxy(new_nsproxy); > goto bad_unshare_cleanup_cred; > + } > } > > if (new_fs || new_fd || do_sysvsem || new_cred || new_nsproxy) { > -- > 2.51.1 > -- Rgrds, legion

4 days, 11 hours

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[PATCH] counter: interrupt-cnt: Drop IRQF_NO_THREAD flag

by A. Sverdlin

From: Alexander Sverdlin <alexander.sverdlin(a)siemens.com> An IRQ handler can either be IRQF_NO_THREAD or acquire spinlock_t, as CONFIG_PROVE_RAW_LOCK_NESTING warns: ============================= [ BUG: Invalid wait context ] 6.18.0-rc1+git... #1 ----------------------------- some-user-space-process/1251 is trying to lock: (&counter->events_list_lock){....}-{3:3}, at: counter_push_event [counter] other info that might help us debug this: context-{2:2} no locks held by some-user-space-process/.... stack backtrace: CPU: 0 UID: 0 PID: 1251 Comm: some-user-space-process 6.18.0-rc1+git... #1 PREEMPT Call trace: show_stack (C) dump_stack_lvl dump_stack __lock_acquire lock_acquire _raw_spin_lock_irqsave counter_push_event [counter] interrupt_cnt_isr [interrupt_cnt] __handle_irq_event_percpu handle_irq_event handle_simple_irq handle_irq_desc generic_handle_domain_irq gpio_irq_handler handle_irq_desc generic_handle_domain_irq gic_handle_irq call_on_irq_stack do_interrupt_handler el0_interrupt __el0_irq_handler_common el0t_64_irq_handler el0t_64_irq ... and Sebastian correctly points out. Remove IRQF_NO_THREAD as an alternative to switching to raw_spinlock_t, because the latter would limit all potential nested locks to raw_spinlock_t only. Cc: Sebastian Andrzej Siewior <bigeasy(a)linutronix.de> Cc: stable(a)vger.kernel.org Link: https://lore.kernel.org/all/20251117151314.xwLAZrWY@linutronix.de/ Fixes: a55ebd47f21f ("counter: add IRQ or GPIO based counter") Signed-off-by: Alexander Sverdlin <alexander.sverdlin(a)siemens.com> --- drivers/counter/interrupt-cnt.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/drivers/counter/interrupt-cnt.c b/drivers/counter/interrupt-cnt.c index 6c0c1d2d7027d..e6100b5fb082e 100644 --- a/drivers/counter/interrupt-cnt.c +++ b/drivers/counter/interrupt-cnt.c @@ -229,8 +229,7 @@ static int interrupt_cnt_probe(struct platform_device *pdev) irq_set_status_flags(priv->irq, IRQ_NOAUTOEN); ret = devm_request_irq(dev, priv->irq, interrupt_cnt_isr, - IRQF_TRIGGER_RISING | IRQF_NO_THREAD, - dev_name(dev), counter); + IRQF_TRIGGER_RISING, dev_name(dev), counter); if (ret) return ret; -- 2.51.1

4 days, 11 hours

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