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| author | Jean-Christophe Guillain <jean-christophe@guillain.net> | 2026-11-05 16:32:19 +0000 |
|---|---|---|
| committer | Joerg Roedel <joerg.roedel@amd.com> | 2026-11-06 13:22:44 +0100 |
| commit | 2cf4be57b301ed2d7af82e70cff5dfd96894d8de (patch) | |
| tree | 840554440aef942334f2800bf8a5ebe2347e7364 /tools/perf/scripts/python/Perf-Trace-Util | |
| parent | fa77b023eb80cdb297ff32f6b13786e483a81ca8 (diff) | |
iommu/amd: Fix NULL pointer dereference for GPUs without upstream bridge
pci_upstream_bridge() can return NULL for devices without an upstream
bridge. The AMD GPU identity mapping quirk dereferences the returned
pointer unconditionally, causing a kernel panic during boot.
Check the pointer before accessing the bridge vendor ID.
This fixes a boot regression on a Lenovo system with an AMD PRO
A10-9700E APU. The system now boots with AMD IOMMU enabled.
Fixes: bf5bdfd1f8d4 ("iommu/amd: Force identity mode for selected GPUs only")
Signed-off-by: Jean-Christophe Guillain <jean-christophe@guillain.net>
Signed-off-by: Vasant Hegde <vasant.hegde@amd.com>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Diffstat (limited to 'tools/perf/scripts/python/Perf-Trace-Util')
0 files changed, 0 insertions, 0 deletions