Re: [PATCH v1 1/6] dma-buf: Move dma_buf_mmap_internal() to dynamic locking specification

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Am 10.11.22 um 21:13 schrieb Dmitry Osipenko:
All dma-buf functions has been moved to dynamic locking specification
The dma_buf_mmap_internal() was missed out by accident. Take reservation
lock around file mapping operation to adhere the common locking convention.

Reported-by: Daniel Vetter <daniel@xxxxxxxx>
Signed-off-by: Dmitry Osipenko <dmitry.osipenko@xxxxxxxxxxxxx>

Reviewed-by: Christian König <christian.koenig@xxxxxxx> for this patch here.

Acked-by: Christian König <christian.koenig@xxxxxxx> for the rest of the series.

Regards,
Christian.

---
  drivers/dma-buf/dma-buf.c | 7 ++++++-
  1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c
index 13bfd2d09c56..b809513b03fe 100644
--- a/drivers/dma-buf/dma-buf.c
+++ b/drivers/dma-buf/dma-buf.c
@@ -129,6 +129,7 @@ static struct file_system_type dma_buf_fs_type = {
  static int dma_buf_mmap_internal(struct file *file, struct vm_area_struct *vma)
  {
  	struct dma_buf *dmabuf;
+	int ret;
if (!is_dma_buf_file(file))
  		return -EINVAL;
@@ -144,7 +145,11 @@ static int dma_buf_mmap_internal(struct file *file, struct vm_area_struct *vma)
  	    dmabuf->size >> PAGE_SHIFT)
  		return -EINVAL;
- 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;
  }
static loff_t dma_buf_llseek(struct file *file, loff_t offset, int whence)




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