diff options
| author | Weizhao Ouyang <o451686892@gmail.com> | 2022-01-04 10:35:45 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-03-08 21:12:37 +0300 |
| commit | 1a62246c2c600e4b5dabe1a5794c6d0bf5a860b5 (patch) | |
| tree | 07d1577eaa9958c7ed76e9b9c2acc609ec990632 /drivers/dma-buf | |
| parent | 8654464086a12f0fb70801ee87bacee713849ca4 (diff) | |
| download | linux-1a62246c2c600e4b5dabe1a5794c6d0bf5a860b5.tar.xz | |
dma-buf: cma_heap: Fix mutex locking section
[ Upstream commit 54329e6f7beea6af56c1230da293acc97d6a6ee7 ]
Fix cma_heap_buffer mutex locking critical section to protect vmap_cnt
and vaddr.
Fixes: a5d2d29e24be ("dma-buf: heaps: Move heap-helper logic into the cma_heap implementation")
Signed-off-by: Weizhao Ouyang <o451686892@gmail.com>
Acked-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Sumit Semwal <sumit.semwal@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20220104073545.124244-1-o451686892@gmail.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/dma-buf')
| -rw-r--r-- | drivers/dma-buf/heaps/cma_heap.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/dma-buf/heaps/cma_heap.c b/drivers/dma-buf/heaps/cma_heap.c index 0c05b79870f9..83f02bd51dda 100644 --- a/drivers/dma-buf/heaps/cma_heap.c +++ b/drivers/dma-buf/heaps/cma_heap.c @@ -124,10 +124,11 @@ static int cma_heap_dma_buf_begin_cpu_access(struct dma_buf *dmabuf, struct cma_heap_buffer *buffer = dmabuf->priv; struct dma_heap_attachment *a; + mutex_lock(&buffer->lock); + if (buffer->vmap_cnt) invalidate_kernel_vmap_range(buffer->vaddr, buffer->len); - mutex_lock(&buffer->lock); list_for_each_entry(a, &buffer->attachments, list) { if (!a->mapped) continue; @@ -144,10 +145,11 @@ static int cma_heap_dma_buf_end_cpu_access(struct dma_buf *dmabuf, struct cma_heap_buffer *buffer = dmabuf->priv; struct dma_heap_attachment *a; + mutex_lock(&buffer->lock); + if (buffer->vmap_cnt) flush_kernel_vmap_range(buffer->vaddr, buffer->len); - mutex_lock(&buffer->lock); list_for_each_entry(a, &buffer->attachments, list) { if (!a->mapped) continue; |