Lu Baolu dda2b8c3c6 iommu/vt-d: Avoid draining PRQ in sva mm release path ... When a PASID is used for SVA by a device, it's possible that the PASID entry is cleared before the device flushes all ongoing DMA requests and removes the SVA domain. This can occur when an exception happens and the process terminates before the device driver stops DMA and calls the iommu driver to unbind the PASID. There's no need to drain the PRQ in the mm release path. Instead, the PRQ will be drained in the SVA unbind path. Unfortunately, commit c43e1ccdeb ("iommu/vt-d: Drain PRQs when domain removed from RID") changed this behavior by unconditionally draining the PRQ in intel_pasid_tear_down_entry(). This can lead to a potential sleeping-in-atomic-context issue. Smatch static checker warning: drivers/iommu/intel/prq.c:95 intel_iommu_drain_pasid_prq() warn: sleeping in atomic context To avoid this issue, prevent draining the PRQ in the SVA mm release path and restore the previous behavior. Fixes: c43e1ccdeb ("iommu/vt-d: Drain PRQs when domain removed from RID") Reported-by: Dan Carpenter <dan.carpenter@linaro.org> Closes: https://lore.kernel.org/linux-iommu/c5187676-2fa2-4e29-94e0-4a279dc88b49@stanley.mountain/ Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com> Reviewed-by: Kevin Tian <kevin.tian@intel.com> Link: https://lore.kernel.org/r/20241212021529.1104745-1-baolu.lu@linux.intel.com Signed-off-by: Joerg Roedel <jroedel@suse.de>		2024-12-13 15:54:27 +01:00
..
amd	iommu/amd: Add lockdep asserts for domain->dev_list	2024-12-10 10:12:06 +01:00
arm	iommu/tegra241-cmdqv: do not use smp_processor_id in preemptible context	2024-12-09 23:38:30 +00:00
intel	iommu/vt-d: Avoid draining PRQ in sva mm release path	2024-12-13 15:54:27 +01:00
iommufd	iommufd 6.13 first rc pull	2024-12-05 15:02:20 -08:00
riscv
apple-dart.c
dma-iommu.c
dma-iommu.h
exynos-iommu.c
fsl_pamu.c
fsl_pamu.h
fsl_pamu_domain.c
fsl_pamu_domain.h
hyperv-iommu.c
io-pgfault.c
io-pgtable-arm-v7s.c
io-pgtable-arm.c
io-pgtable-arm.h
io-pgtable-dart.c
io-pgtable.c
iommu-debugfs.c
iommu-pages.h
iommu-priv.h
iommu-sva.c
iommu-sysfs.c
iommu-traces.c
iommu.c	module: Convert symbol namespace to string literal	2024-12-02 11:34:44 -08:00
iova.c
ipmmu-vmsa.c
irq_remapping.c
irq_remapping.h
Kconfig
Makefile
msm_iommu.c
msm_iommu.h
msm_iommu_hw-8xxx.h
mtk_iommu.c
mtk_iommu_v1.c
of_iommu.c
omap-iommu-debug.c
omap-iommu.c
omap-iommu.h
omap-iopgtable.h
rockchip-iommu.c
s390-iommu.c
sprd-iommu.c
sun50i-iommu.c
tegra-smmu.c
virtio-iommu.c