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[media] videobuf_pages_to_sg: sglist[0] length problem

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On function videobuf_pages_to_sg the statement sg_set_page(&sglist[0],
pages[0], PAGE_SIZE - offset, offset) will fail if size is less than
PAGE_SIZE.

Signed-off-by: Newson Edouard <newsondev@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Newson Edouard 2011-04-19 11:54:54 -03:00 committed by Mauro Carvalho Chehab
parent 4bbcd849b0
commit 45f239ab82
1 changed files with 3 additions and 2 deletions
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5
drivers/media/video/videobuf-dma-sg.c
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@ -108,8 +108,9 @@ static struct scatterlist *videobuf_pages_to_sg(struct page **pages,
if (PageHighMem(pages[0]))
/* DMA to highmem pages might not work */
goto highmem;
sg_set_page(&sglist[0], pages[0], PAGE_SIZE - offset, offset);
size -= PAGE_SIZE - offset;
sg_set_page(&sglist[0], pages[0],
min_t(size_t, PAGE_SIZE - offset, size), offset);
size -= min_t(size_t, PAGE_SIZE - offset, size);
for (i = 1; i < nr_pages; i++) {
if (NULL == pages[i])
goto nopage;