[+cc Marcin, Thorsten]
On Sat, Oct 12, 2024 at 11:07:20AM +0800, Lu Baolu wrote:
Previously, the domain_context_clear() function incorrectly called pci_for_each_dma_alias() to set up context entries for non-PCI devices. This could lead to kernel hangs or other unexpected behavior.
Add a check to only call pci_for_each_dma_alias() for PCI devices. For non-PCI devices, domain_context_clear_one() is called directly.
Reported-by: Todd Brandt todd.e.brandt@intel.com Closes: https://bugzilla.kernel.org/show_bug.cgi?id=219363
Likely the same problem reported earlier by Marcin at https://bugzilla.kernel.org/show_bug.cgi?id=219349
Thanks to Thorsten for pointing this out.
Fixes: 9a16ab9d6402 ("iommu/vt-d: Make context clearing consistent with context mapping") Cc: stable@vger.kernel.org Signed-off-by: Lu Baolu baolu.lu@linux.intel.com
drivers/iommu/intel/iommu.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c index 9f6b0780f2ef..e860bc9439a2 100644 --- a/drivers/iommu/intel/iommu.c +++ b/drivers/iommu/intel/iommu.c @@ -3340,8 +3340,10 @@ static int domain_context_clear_one_cb(struct pci_dev *pdev, u16 alias, void *op */ static void domain_context_clear(struct device_domain_info *info) {
- if (!dev_is_pci(info->dev))
- if (!dev_is_pci(info->dev)) { domain_context_clear_one(info, info->bus, info->devfn);
return;- }
pci_for_each_dma_alias(to_pci_dev(info->dev), &domain_context_clear_one_cb, info); -- 2.43.0