diff options
| author | Liviu Dudau <liviu.dudau@arm.com> | 2024-11-06 18:58:06 +0000 |
|---|---|---|
| committer | Steven Price <steven.price@arm.com> | 2024-11-07 15:23:54 +0000 |
| commit | 444fa5b100e5c90550d6bccfe4476efb0391b3ca (patch) | |
| tree | 16ade418aeb6641f46702d81ecee327d43cda204 | |
| parent | 052ef642bd6c108a24f375f9ad174b97b425a50b (diff) | |
| download | linux-444fa5b100e5c90550d6bccfe4476efb0391b3ca.tar.gz linux-444fa5b100e5c90550d6bccfe4476efb0391b3ca.tar.bz2 linux-444fa5b100e5c90550d6bccfe4476efb0391b3ca.zip | |
drm/panthor: Lock XArray when getting entries for the VM
Similar to commit cac075706f29 ("drm/panthor: Fix race when converting
group handle to group object") we need to use the XArray's internal
locking when retrieving a vm pointer from there.
v2: Removed part of the patch that was trying to protect fetching
the heap pointer from XArray, as that operation is protected by
the @pool->lock.
Fixes: 647810ec2476 ("drm/panthor: Add the MMU/VM logical block")
Reported-by: Jann Horn <jannh@google.com>
Cc: stable@vger.kernel.org
Signed-off-by: Liviu Dudau <liviu.dudau@arm.com>
Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
Reviewed-by: Steven Price <steven.price@arm.com>
Signed-off-by: Steven Price <steven.price@arm.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20241106185806.389089-1-liviu.dudau@arm.com
| -rw-r--r-- | drivers/gpu/drm/panthor/panthor_mmu.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/gpu/drm/panthor/panthor_mmu.c b/drivers/gpu/drm/panthor/panthor_mmu.c index 5d5e25b1be95..7db2edb3374c 100644 --- a/drivers/gpu/drm/panthor/panthor_mmu.c +++ b/drivers/gpu/drm/panthor/panthor_mmu.c @@ -1580,7 +1580,9 @@ panthor_vm_pool_get_vm(struct panthor_vm_pool *pool, u32 handle) { struct panthor_vm *vm; + xa_lock(&pool->xa); vm = panthor_vm_get(xa_load(&pool->xa, handle)); + xa_unlock(&pool->xa); return vm; } |