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[PATCH] soc/tegra: fuse: Do not register SoC device on ACPI boot

by Kartik Rajput

On Tegra platforms using ACPI, the SMCCC driver already registers the SoC device. This makes the registration performed by the Tegra fuse driver redundant. When booted via ACPI, skip registering the SoC device and suppress printing SKU information from the Tegra fuse driver, as this information is already provided by the SMCCC driver. Fixes: 972167c69080 ("soc/tegra: fuse: Add ACPI support for Tegra194 and Tegra234") Cc: stable(a)vger.kernel.org Signed-off-by: Kartik Rajput <kkartik(a)nvidia.com> --- drivers/soc/tegra/fuse/fuse-tegra.c | 2 -- 1 file changed, 2 deletions(-) diff --git a/drivers/soc/tegra/fuse/fuse-tegra.c b/drivers/soc/tegra/fuse/fuse-tegra.c index d27667283846..74d2fedea71c 100644 --- a/drivers/soc/tegra/fuse/fuse-tegra.c +++ b/drivers/soc/tegra/fuse/fuse-tegra.c @@ -182,8 +182,6 @@ static int tegra_fuse_probe(struct platform_device *pdev) } fuse->soc->init(fuse); - tegra_fuse_print_sku_info(&tegra_sku_info); - tegra_soc_device_register(); err = tegra_fuse_add_lookups(fuse); if (err) -- 2.43.0

52 minutes

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[PATCH 6.6.y 0/2] riscv: mm: Backport of mmap hint address fixes

by Vivian Wang

Backport of the two riscv mmap patches from master. In effect, these two patches removes arch_get_mmap_{base,end} for riscv. Guo Ren: Please take a look. Patch 1 has a slightly non-trivial conflict with your commit 97b7ac69be2e ("riscv: mm: Fixup compat arch_get_mmap_end"), which changed STACK_TOP_MAX from TASK_SIZE_64 to TASK_SIZE when CONFIG_64BIT=y. This shouldn't be a problem, but, well, just to be safe. --- Charlie Jenkins (2): riscv: mm: Use hint address in mmap if available riscv: mm: Do not restrict mmap address based on hint arch/riscv/include/asm/processor.h | 33 +++++---------------------------- 1 file changed, 5 insertions(+), 28 deletions(-) --- base-commit: 60a9e718726fa7019ae00916e4b1c52498da5b60 change-id: 20250917-riscv-mmap-addr-space-6-6-15e7db6b5db6 Best regards, -- Vivian "dramforever" Wang

1 hour, 47 minutes

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BUS105 Exam Format Explained: What You Need to Know Before You Register

by Jerry

Understanding the BUS105 exam format before you register is crucial for building an effective study strategy and avoiding surprises on test day. The BUS105 exam evaluates your knowledge of business fundamentals, including management principles, marketing concepts, financial literacy, and organizational behavior. The test typically consists of multiple-choice questions designed to measure both theoretical understanding and practical application of business concepts. To prepare efficiently, familiarize yourself with the structure and types of questions you’ll face. Practicing with BUS105 Practice Questions from study4exam can give you a clear idea of what to expect. These resources replicate real exam conditions, allowing you to improve time management and accuracy while identifying areas that need more attention. More info visit this website: https://www.study4exam.com/saylor/free-bus105-questions Understanding the marking scheme, question difficulty, and key focus areas in advance ensures you go into the exam well-prepared and confident. With the right preparation strategy and quality practice materials, you can successfully master the BUS105 exam and take a significant step toward your academic or professional goals.

1 hour, 51 minutes

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[PATCH v2 1/1] hung_task: fix warnings caused by unaligned lock pointers

by Lance Yang

From: Lance Yang <lance.yang(a)linux.dev> The blocker tracking mechanism assumes that lock pointers are at least 4-byte aligned to use their lower bits for type encoding. However, as reported by Eero Tamminen, some architectures like m68k only guarantee 2-byte alignment of 32-bit values. This breaks the assumption and causes two related WARN_ON_ONCE checks to trigger. To fix this, the runtime checks are adjusted to silently ignore any lock that is not 4-byte aligned, effectively disabling the feature in such cases and avoiding the related warnings. Thanks to Geert Uytterhoeven for bisecting! Reported-by: Eero Tamminen <oak(a)helsinkinet.fi> Closes: https://lore.kernel.org/lkml/CAMuHMdW7Ab13DdGs2acMQcix5ObJK0O2dG_Fxzr8_g58R… Fixes: e711faaafbe5 ("hung_task: replace blocker_mutex with encoded blocker") Cc: <stable(a)vger.kernel.org> Reviewed-by: Masami Hiramatsu (Google) <mhiramat(a)kernel.org> Signed-off-by: Lance Yang <lance.yang(a)linux.dev> --- v1 -> v2: - Pick RB from Masami - thanks! - Update the changelog and comments - https://lore.kernel.org/lkml/20250823050036.7748-1-lance.yang@linux.dev/ include/linux/hung_task.h | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/include/linux/hung_task.h b/include/linux/hung_task.h index 34e615c76ca5..c4403eeb7144 100644 --- a/include/linux/hung_task.h +++ b/include/linux/hung_task.h @@ -20,6 +20,10 @@ * always zero. So we can use these bits to encode the specific blocking * type. * + * Note that on architectures where this is not guaranteed, or for any + * unaligned lock, this tracking mechanism is silently skipped for that + * lock. + * * Type encoding: * 00 - Blocked on mutex (BLOCKER_TYPE_MUTEX) * 01 - Blocked on semaphore (BLOCKER_TYPE_SEM) @@ -45,7 +49,7 @@ static inline void hung_task_set_blocker(void *lock, unsigned long type) * If the lock pointer matches the BLOCKER_TYPE_MASK, return * without writing anything. */ - if (WARN_ON_ONCE(lock_ptr & BLOCKER_TYPE_MASK)) + if (lock_ptr & BLOCKER_TYPE_MASK) return; WRITE_ONCE(current->blocker, lock_ptr | type); @@ -53,8 +57,6 @@ static inline void hung_task_set_blocker(void *lock, unsigned long type) static inline void hung_task_clear_blocker(void) { - WARN_ON_ONCE(!READ_ONCE(current->blocker)); - WRITE_ONCE(current->blocker, 0UL); } -- 2.49.0

1 hour, 56 minutes

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[Patch v3 1/2] mm/huge_memory: add pmd folio to ds_queue in do_huge_zero_wp_pmd()

by Wei Yang

We add pmd folio into ds_queue on the first page fault in __do_huge_pmd_anonymous_page(), so that we can split it in case of memory pressure. This should be the same for a pmd folio during wp page fault. Commit 1ced09e0331f ("mm: allocate THP on hugezeropage wp-fault") miss to add it to ds_queue, which means system may not reclaim enough memory in case of memory pressure even the pmd folio is under used. Move deferred_split_folio() into map_anon_folio_pmd() to make the pmd folio installation consistent. Fixes: 1ced09e0331f ("mm: allocate THP on hugezeropage wp-fault") Signed-off-by: Wei Yang <richard.weiyang(a)gmail.com> Cc: David Hildenbrand <david(a)redhat.com> Cc: Lance Yang <lance.yang(a)linux.dev> Cc: Dev Jain <dev.jain(a)arm.com> Acked-by: David Hildenbrand <david(a)redhat.com> Reviewed-by: Lance Yang <lance.yang(a)linux.dev> Reviewed-by: Dev Jain <dev.jain(a)arm.com> Acked-by: Usama Arif <usamaarif642(a)gmail.com> Reviewed-by: Zi Yan <ziy(a)nvidia.com> Cc: <stable(a)vger.kernel.org> --- v3: * rebase on latest mm-new * gather rb and acked-by v2: * add fix, cc stable and put description about the flow of current code * move deferred_split_folio() into map_anon_folio_pmd() --- mm/huge_memory.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mm/huge_memory.c b/mm/huge_memory.c index 002922bb6e42..e86699306c5e 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -1317,6 +1317,7 @@ static void map_anon_folio_pmd(struct folio *folio, pmd_t *pmd, count_vm_event(THP_FAULT_ALLOC); count_mthp_stat(HPAGE_PMD_ORDER, MTHP_STAT_ANON_FAULT_ALLOC); count_memcg_event_mm(vma->vm_mm, THP_FAULT_ALLOC); + deferred_split_folio(folio, false); } static vm_fault_t __do_huge_pmd_anonymous_page(struct vm_fault *vmf) @@ -1357,7 +1358,6 @@ static vm_fault_t __do_huge_pmd_anonymous_page(struct vm_fault *vmf) pgtable_trans_huge_deposit(vma->vm_mm, vmf->pmd, pgtable); map_anon_folio_pmd(folio, vmf->pmd, vma, haddr); mm_inc_nr_ptes(vma->vm_mm); - deferred_split_folio(folio, false); spin_unlock(vmf->ptl); } -- 2.34.1

2 hours, 13 minutes

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[PATCH] media: mtk-mdp: Fix a reference leak bug in mtk_mdp_remove()

by Haoxiang Li

In mtk_mdp_probe(), vpu_get_plat_device() increases the reference count of the returned platform device. Add platform_device_put() to prevent reference leak. Fixes: c8eb2d7e8202 ("[media] media: Add Mediatek MDP Driver") Cc: stable(a)vger.kernel.org Signed-off-by: Haoxiang Li <haoxiang_li2024(a)163.com> --- drivers/media/platform/mediatek/mdp/mtk_mdp_core.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/media/platform/mediatek/mdp/mtk_mdp_core.c b/drivers/media/platform/mediatek/mdp/mtk_mdp_core.c index 80fdc6ff57e0..eb212ca1a083 100644 --- a/drivers/media/platform/mediatek/mdp/mtk_mdp_core.c +++ b/drivers/media/platform/mediatek/mdp/mtk_mdp_core.c @@ -242,6 +242,7 @@ static void mtk_mdp_remove(struct platform_device *pdev) pm_runtime_disable(&pdev->dev); vb2_dma_contig_clear_max_seg_size(&pdev->dev); + platform_device_put(mdp->vpu_dev); mtk_mdp_unregister_m2m_device(mdp); v4l2_device_unregister(&mdp->v4l2_dev); -- 2.25.1

3 hours, 6 minutes

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[PATCH v3] media: mtk-mdp: Fix error handling in probe function

by Haoxiang Li

Add mtk_mdp_unregister_m2m_device() on the error handling path to prevent resource leak. Add check for the return value of vpu_get_plat_device() to prevent null pointer dereference. And vpu_get_plat_device() increases the reference count of the returned platform device. Add platform_device_put() to prevent reference leak. Fixes: c8eb2d7e8202 ("[media] media: Add Mediatek MDP Driver") Cc: stable(a)vger.kernel.org Signed-off-by: Haoxiang Li <haoxiang_li2024(a)163.com> --- Changes in v3: - Modify the patch subject and description. - Patch v2 is a little bit verbose and trivial, so I changed the subject and moved the fixes of mtk_mdp_remove to a separate patch. Thanks, Nicolas! Changes in v2: - Add check for vpu_get_plat_device() - Add platform_device_put() in mtk_mdp_remove() - Add mtk_mdp_unregister_m2m_device() on the error handling path. - Modify the patch title and description. I think you are right. Thanks, CJ! --- .../media/platform/mediatek/mdp/mtk_mdp_core.c | 16 ++++++++++++++-- 1 file changed, 14 insertions(+), 2 deletions(-) diff --git a/drivers/media/platform/mediatek/mdp/mtk_mdp_core.c b/drivers/media/platform/mediatek/mdp/mtk_mdp_core.c index 80fdc6ff57e0..f78fa30f1864 100644 --- a/drivers/media/platform/mediatek/mdp/mtk_mdp_core.c +++ b/drivers/media/platform/mediatek/mdp/mtk_mdp_core.c @@ -194,11 +194,17 @@ static int mtk_mdp_probe(struct platform_device *pdev) } mdp->vpu_dev = vpu_get_plat_device(pdev); + if (!mdp->vpu_dev) { + dev_err(&pdev->dev, "Failed to get vpu device\n"); + ret = -ENODEV; + goto err_vpu_get_dev; + } + ret = vpu_wdt_reg_handler(mdp->vpu_dev, mtk_mdp_reset_handler, mdp, VPU_RST_MDP); if (ret) { dev_err(&pdev->dev, "Failed to register reset handler\n"); - goto err_m2m_register; + goto err_reg_handler; } platform_set_drvdata(pdev, mdp); @@ -206,7 +212,7 @@ static int mtk_mdp_probe(struct platform_device *pdev) ret = vb2_dma_contig_set_max_seg_size(&pdev->dev, DMA_BIT_MASK(32)); if (ret) { dev_err(&pdev->dev, "Failed to set vb2 dma mag seg size\n"); - goto err_m2m_register; + goto err_reg_handler; } pm_runtime_enable(dev); @@ -214,6 +220,12 @@ static int mtk_mdp_probe(struct platform_device *pdev) return 0; +err_reg_handler: + platform_device_put(mdp->vpu_dev); + +err_vpu_get_dev: + mtk_mdp_unregister_m2m_device(mdp); + err_m2m_register: v4l2_device_unregister(&mdp->v4l2_dev); -- 2.25.1

3 hours, 13 minutes

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[PATCH] exfat: fix out-of-bounds in exfat_nls_to_ucs2()

by Jeongjun Park

After the loop that converts characters to ucs2 ends, the variable i may be greater than or equal to len. However, when checking whether the last byte of p_cstring is NULL, the variable i is used as is, resulting in an out-of-bounds read if i >= len. Therefore, to prevent this, we need to modify the function to check whether i is less than len, and if i is greater than or equal to len, to check p_cstring[len - 1] byte. Cc: <stable(a)vger.kernel.org> Reported-by: syzbot+98cc76a76de46b3714d4(a)syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=98cc76a76de46b3714d4 Fixes: 370e812b3ec1 ("exfat: add nls operations") Signed-off-by: Jeongjun Park <aha310510(a)gmail.com> --- fs/exfat/nls.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/exfat/nls.c b/fs/exfat/nls.c index 8243d94ceaf4..a52f3494eb20 100644 --- a/fs/exfat/nls.c +++ b/fs/exfat/nls.c @@ -616,7 +616,7 @@ static int exfat_nls_to_ucs2(struct super_block *sb, unilen++; } - if (p_cstring[i] != '\0') + if (p_cstring[min(i, len - 1)] != '\0') lossy |= NLS_NAME_OVERLEN; *uniname = '\0'; --

3 hours, 15 minutes

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kvm: arm64: stable commit "Fix kernel BUG() due to bad backport of FPSIMD/SVE/SME fix" deadlocks host kernel

by Sergey Senozhatsky

Commits 8f4dc4e54eed4 (6.1.y) and 23249dade24e6 (5.15.y) (maybe other stable kernels as well) deadlock the host kernel (presumably a recursive spinlock): queued_spin_lock_slowpath+0x274/0x358 raw_spin_rq_lock_nested+0x2c/0x48 _raw_spin_rq_lock_irqsave+0x30/0x4c run_rebalance_domains+0x808/0x2e18 __do_softirq+0x104/0x550 irq_exit+0x88/0xe0 handle_domain_irq+0x7c/0xb0 gic_handle_irq+0x1cc/0x420 call_on_irq_stack+0x20/0x48 do_interrupt_handler+0x3c/0x50 el1_interrupt+0x30/0x58 el1h_64_irq_handler+0x18/0x24 el1h_64_irq+0x7c/0x80 kvm_arch_vcpu_ioctl_run+0x24c/0x49c kvm_vcpu_ioctl+0xc4/0x614 We found out a similar report at [1], but it doesn't seem like a formal patch was ever posted. Will, can you please send a formal patch so that stable kernels can run VMs again? [1] https://lists.linaro.org/archives/list/linux-stable-mirror@lists.linaro.org…

3 hours, 22 minutes

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[PATCH 0/1] Backport request: Fix reading issue on mcp2221

by Romain Sioen

Hi maintainers, Please consider backporting the following patches to the stable trees. These patches fix a significant reading issue with mcp2221 on i2c eeprom. This request is following the one I did previously to fix hid-mcp2221 in previous LTS versions. I have confirmed that the patches applie cleanly and build successfully against v6.12, v6.6, v6.1, v5.15 and v5.10 stable branches. Thanks, Romain Arnaud Lecomte (1): hid: fix I2C read buffer overflow in raw_event() for mcp2221 drivers/hid/hid-mcp2221.c | 4 ++++ 1 file changed, 4 insertions(+) -- 2.48.1

3 hours, 45 minutes

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