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dma-buf: Suppress a thread-safety complaint

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Handle all possible dma_resv_lock() return values. This patch prepares
for enabling compile-time thread-safety analysis. This will cause the
compiler to check whether all dma_resv_lock() return values are handled.

Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Christian König <christian.koenig@amd.com>
Link: https://lore.kernel.org/r/20260227165501.2062829-1-bvanassche@acm.org
This commit is contained in:
Bart Van Assche 2026-02-27 08:55:01 -08:00 committed by Christian König
parent 0dd7a23da2
commit 01086b97dc
1 changed files with 4 additions and 1 deletions
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5
drivers/dma-buf/dma-resv.c
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@ -790,8 +790,11 @@ static int __init dma_resv_lockdep(void)
mmap_read_lock(mm);
ww_acquire_init(&ctx, &reservation_ww_class);
ret = dma_resv_lock(&obj, &ctx);
if (ret == -EDEADLK)
if (ret) {
/* Only EDEADLK from the error injection is possible here */
WARN_ON(ret != -EDEADLK);
dma_resv_lock_slow(&obj, &ctx);
}
fs_reclaim_acquire(GFP_KERNEL);
/* for unmap_mapping_range on trylocked buffer objects in shrinkers */
i_mmap_lock_write(&mapping);