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dma-buf: might_sleep() in dma_buf_unmap_attachment()

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We never really clarified if unmap could be done in atomic context.
But since mapping might require sleeping, this implies mutex in use
to synchronize mapping/unmapping, so unmap could sleep as well.  Add
a might_sleep() to clarify this.

Signed-off-by: Rob Clark <rob@ti.com>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@canonical.com>
Signed-off-by: Sumit Semwal <sumit.semwal@linaro.org>
This commit is contained in:
Rob Clark 2012-09-28 09:29:43 +02:00 committed by Sumit Semwal
parent f01af9f858
commit b6fa0cd62c
1 changed files with 2 additions and 0 deletions
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2
drivers/base/dma-buf.c
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@ -298,6 +298,8 @@ void dma_buf_unmap_attachment(struct dma_buf_attachment *attach,
struct sg_table *sg_table, struct sg_table *sg_table,
enum dma_data_direction direction) enum dma_data_direction direction)
{ {
might_sleep();
if (WARN_ON(!attach || !attach->dmabuf || !sg_table)) if (WARN_ON(!attach || !attach->dmabuf || !sg_table))
return; return;