6.6-stable review patch. If anyone has any objections, please let me know.
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From: Lu Baolu baolu.lu@linux.intel.com
commit 6e02a277f1db24fa039e23783c8921c7b0e5b1b3 upstream.
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 Closes: https://bugzilla.kernel.org/show_bug.cgi?id=219349 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 Link: https://lore.kernel.org/r/20241014013744.102197-2-baolu.lu@linux.intel.com Signed-off-by: Joerg Roedel jroedel@suse.de Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/iommu/intel/iommu.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
--- a/drivers/iommu/intel/iommu.c +++ b/drivers/iommu/intel/iommu.c @@ -3925,8 +3925,10 @@ static int domain_context_clear_one_cb(s */ 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);