[PATCH] dma-buf: might_sleep() in dma_buf_unmap_attachment()

[Maarten Lankhorst]

Op 28-09-12 09:29, Rob Clark schreef:
> From: Rob Clark <rob at ti.com>
>
> 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 at ti.com>
> Acked-by: Daniel Vetter <daniel.vetter at ffwll.ch>
> ---
>  drivers/base/dma-buf.c |    2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/drivers/base/dma-buf.c b/drivers/base/dma-buf.c
> index c30f3e1..877eacb 100644
> --- a/drivers/base/dma-buf.c
> +++ b/drivers/base/dma-buf.c
> @@ -298,6 +298,8 @@ void dma_buf_unmap_attachment(struct dma_buf_attachment *attach,
>  				struct sg_table *sg_table,
>  				enum dma_data_direction direction)
>  {
> +	might_sleep();
> +
>  	if (WARN_ON(!attach || !attach->dmabuf || !sg_table))
>  		return;
>  
Looks good to me!

Reviewed-by: Maarten Lankhorst <maarten.lankhorst at canonical.com>