Re: [PATCH] drm/i915/ttm: Fix illegal addition to shrinker list

On 11/10/21 11:29, Matthew Auld wrote:

On 10/11/2021 08:55, Thomas Hellström wrote:

...

There's a small window of opportunity during which the adjust_lru() function can be called with a GEM refcount of zero from the TTM eviction code. This results in a kernel BUG().

Ensure that we don't attempt to modify the GEM shrinker lists unless we have a GEM refcount.

Fixes: ebd4a8ec7799 ("drm/i915/ttm: move shrinker management into adjust_lru") Signed-off-by: Thomas Hellström thomas.hellstrom@linux.intel.com

Reviewed-by: Matthew Auld matthew.auld@intel.com

Thanks for reviewing, Matt.

/Thomas