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| author | Dmitry Osipenko <dmitry.osipenko@collabora.com> | 2022-10-30 18:44:11 +0300 |
|---|---|---|
| committer | Dmitry Osipenko <dmitry.osipenko@collabora.com> | 2022-11-02 13:52:38 +0300 |
| commit | d3292daee319581d0a502fcd8ef3c3c285a1750a (patch) | |
| tree | 5a9d686cfb246c4312757b23ae2e8653ea34a764 /drivers/dma-buf | |
| parent | 387659939c00156f8d6bab0fbc55b4eaf2b6bc5b (diff) | |
| download | linux-d3292daee319581d0a502fcd8ef3c3c285a1750a.tar.xz | |
dma-buf: Make locking consistent in dma_buf_detach()
The dma_buf_detach() locks attach->dmabuf->resv and then unlocks
dmabuf->resv, which could be a two different locks from a static
code checker perspective. In particular this triggers Smatch to
report the "double unlock" error. Make the locking pointers consistent.
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Link: https://lore.kernel.org/dri-devel/Y1fLfsccW3AS%2Fo+%2F@kili/
Fixes: 809d9c72c2f8 ("dma-buf: Move dma_buf_attach() to dynamic locking specification")
Signed-off-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20221030154412.8320-2-dmitry.osipenko@collabora.com
Diffstat (limited to 'drivers/dma-buf')
| -rw-r--r-- | drivers/dma-buf/dma-buf.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c index c40d72d318fd..13bfd2d09c56 100644 --- a/drivers/dma-buf/dma-buf.c +++ b/drivers/dma-buf/dma-buf.c @@ -995,10 +995,10 @@ static void __unmap_dma_buf(struct dma_buf_attachment *attach, */ void dma_buf_detach(struct dma_buf *dmabuf, struct dma_buf_attachment *attach) { - if (WARN_ON(!dmabuf || !attach)) + if (WARN_ON(!dmabuf || !attach || dmabuf != attach->dmabuf)) return; - dma_resv_lock(attach->dmabuf->resv, NULL); + dma_resv_lock(dmabuf->resv, NULL); if (attach->sgt) { |