[PATCH] drm/panthor: Lock XArray when getting entries for heap and VM
Boris Brezillon
boris.brezillon at collabora.com
Wed Nov 6 13:21:33 UTC 2024
On Wed, 6 Nov 2024 13:10:37 +0000
Liviu Dudau <liviu.dudau at arm.com> wrote:
> panthor_heap_pool_release() does not take the panthor_heap_pool::lock, so the protection
> is not really there. I could fix panthor_heap_pool_release() and then add a
> lockdep_assert_held() before both calls to xa_load() if you think that's a better
> solution.
Hm, but panthor_heap_pool_release() doesn't release the heap contexts,
it just calls xa_destroy(). If we have objects remaining in the xarray,
they'll be leaked, but that's not a race. BTW, can we make this two
separate patches. I feel like the thing on the vm is an actual fix,
while the second one (adding a helper with a lockdep_assert()) is
safety net that's worth having, but not necessarily something we need
to backport.
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