* [PATCH] dma-buf: might_sleep() in dma_buf_unmap_attachment()
@ 2012-09-28 7:29 Rob Clark
2012-09-28 7:39 ` Maarten Lankhorst
0 siblings, 1 reply; 3+ messages in thread
From: Rob Clark @ 2012-09-28 7:29 UTC (permalink / raw)
To: dri-devel, linaro-mm-sig, linux-media
Cc: patches, daniel.vetter, sumit.semwal, maarten.lankhorst,
Rob Clark
From: Rob Clark <rob@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@ti.com>
Acked-by: Daniel Vetter <daniel.vetter@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;
--
1.7.9.5
^ permalink raw reply related [flat|nested] 3+ messages in thread* Re: [PATCH] dma-buf: might_sleep() in dma_buf_unmap_attachment()
2012-09-28 7:29 [PATCH] dma-buf: might_sleep() in dma_buf_unmap_attachment() Rob Clark
@ 2012-09-28 7:39 ` Maarten Lankhorst
2012-09-29 6:24 ` Sumit Semwal
0 siblings, 1 reply; 3+ messages in thread
From: Maarten Lankhorst @ 2012-09-28 7:39 UTC (permalink / raw)
To: Rob Clark
Cc: dri-devel, linaro-mm-sig, linux-media, patches, daniel.vetter,
sumit.semwal, Rob Clark
Op 28-09-12 09:29, Rob Clark schreef:
> From: Rob Clark <rob@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@ti.com>
> Acked-by: Daniel Vetter <daniel.vetter@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@canonical.com>
^ permalink raw reply [flat|nested] 3+ messages in thread* Re: [PATCH] dma-buf: might_sleep() in dma_buf_unmap_attachment()
2012-09-28 7:39 ` Maarten Lankhorst
@ 2012-09-29 6:24 ` Sumit Semwal
0 siblings, 0 replies; 3+ messages in thread
From: Sumit Semwal @ 2012-09-29 6:24 UTC (permalink / raw)
To: Maarten Lankhorst
Cc: Rob Clark, dri-devel, linaro-mm-sig, linux-media, patches,
daniel.vetter, Rob Clark
On Friday 28 September 2012 01:09 PM, Maarten Lankhorst wrote:
> Op 28-09-12 09:29, Rob Clark schreef:
>> From: Rob Clark <rob@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@ti.com>
>> Acked-by: Daniel Vetter <daniel.vetter@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@canonical.com>
Thanks Rob,
Applied to for-next.
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^ permalink raw reply [flat|nested] 3+ messages in thread
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2012-09-28 7:29 [PATCH] dma-buf: might_sleep() in dma_buf_unmap_attachment() Rob Clark
2012-09-28 7:39 ` Maarten Lankhorst
2012-09-29 6:24 ` Sumit Semwal
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