drm/amd/ras: reset CPER ring on corrupt entry size

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When CPER ring overflow handling advances the read pointer, it trusts the
parsed entry size from the current ring contents. Corrupt CPER data can
produce an entry size that does not advance rptr after dword conversion
and pointer masking.

In that case the recovery loop keeps testing the same location while
holding the CPER ring mutex. This can hang the worker that is writing the
next CPER record.

Detect a no-progress rptr update and reset the CPER ring to an empty
state instead. This drops the corrupt contents and lets the writer leave
the recovery path without spinning.

Signed-off-by: Xiang Liu <xiang.liu@amd.com>
Reviewed-by: Stanley.Yang <Stanley.Yang@amd.com>
Reviewed-by: Tao Zhou <tao.zhou1@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

...

This commit is contained in:

Xiang Liu 2026-05-11 15:48:55 +08:00 • committed by Alex Deucher

parent 5c02889ea2

commit 4d695e66d7

1 changed files with 16 additions and 4 deletions

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drivers/gpu/drm/amd/amdgpu/amdgpu_cper.c

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