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usb: gadget/uvc: Add support for 'get_unmapped_area' for MMUless architectures

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This patch adds the support for 'get_unmapped_area' in UVC gadget
which is called when the 'mmap' system call is executed on MMUless
architectures.

Signed-off-by: Bhupesh Sharma <bhupesh.sharma@st.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
This commit is contained in:
Bhupesh Sharma
2013-03-28 15:11:53 +05:30
committed by Felipe Balbi
parent d692522577
commit 2f1d570693
2 changed files with 33 additions and 0 deletions
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18
drivers/usb/gadget/uvc_queue.c
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@@ -232,6 +232,24 @@ static int uvc_queue_mmap(struct uvc_video_queue *queue,
return ret;
}
#ifndef CONFIG_MMU
/*
* Get unmapped area.
*
* NO-MMU arch need this function to make mmap() work correctly.
*/
static unsigned long uvc_queue_get_unmapped_area(struct uvc_video_queue *queue,
unsigned long pgoff)
{
unsigned long ret;
mutex_lock(&queue->mutex);
ret = vb2_get_unmapped_area(&queue->queue, 0, 0, pgoff, 0);
mutex_unlock(&queue->mutex);
return ret;
}
#endif
/*
* Cancel the video buffers queue.
*