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dma-buf: Move dma_buf_mmap() to dynamic locking specification

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Move dma_buf_mmap() function to the dynamic locking specification by
taking the reservation lock. Neither of the today's drivers take the
reservation lock within the mmap() callback, hence it's safe to enforce
the locking.

Acked-by: Sumit Semwal <sumit.semwal@linaro.org>
Acked-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20221017172229.42269-19-dmitry.osipenko@collabora.com
This commit is contained in:
Dmitry Osipenko 2022-10-17 20:22:26 +03:00
parent 47e982d519
commit d078fd9b8d
1 changed files with 7 additions and 1 deletions
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8
drivers/dma-buf/dma-buf.c
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@ -1390,6 +1390,8 @@ EXPORT_SYMBOL_NS_GPL(dma_buf_end_cpu_access, DMA_BUF);
int dma_buf_mmap(struct dma_buf *dmabuf, struct vm_area_struct *vma,
unsigned long pgoff)
{
int ret;
if (WARN_ON(!dmabuf || !vma))
return -EINVAL;
@ -1410,7 +1412,11 @@ int dma_buf_mmap(struct dma_buf *dmabuf, struct vm_area_struct *vma,
vma_set_file(vma, dmabuf->file);
vma->vm_pgoff = pgoff;
return dmabuf->ops->mmap(dmabuf, vma);
dma_resv_lock(dmabuf->resv, NULL);
ret = dmabuf->ops->mmap(dmabuf, vma);
dma_resv_unlock(dmabuf->resv);
return ret;
}
EXPORT_SYMBOL_NS_GPL(dma_buf_mmap, DMA_BUF);