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UPSTREAM: dma-buf: cma_heap: Fix mutex locking section

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Fix cma_heap_buffer mutex locking critical section to protect vmap_cnt
and vaddr.

Bug: 254441685
Fixes: a5d2d29e24 ("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
(cherry picked from commit 54329e6f7b)
Signed-off-by: Lee Jones <joneslee@google.com>
Change-Id: Ie83cf515450576799364d2e7476a4ff7286ff271
This commit is contained in:
Weizhao Ouyang
2022-01-04 15:35:45 +08:00
committed by Lee Jones
parent 8d34761975
commit 01a7ade4e5
1 changed files with 4 additions and 2 deletions
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6
drivers/dma-buf/heaps/cma_heap.c
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@@ -126,10 +126,11 @@ 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;
@@ -146,10 +147,11 @@ 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;