forked from Minki/linux
[media] ivtv: Convert to get_user_pages_unlocked()
Convert ivtv_yuv_prep_user_dma() to use get_user_pages_unlocked() so that we don't unnecessarily leak knowledge about mm locking into drivers code. CC: Andy Walls <awalls@md.metrocast.net> Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
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@ -75,15 +75,15 @@ static int ivtv_yuv_prep_user_dma(struct ivtv *itv, struct ivtv_user_dma *dma,
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ivtv_udma_get_page_info (&uv_dma, (unsigned long)args->uv_source, 360 * uv_decode_height);
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/* Get user pages for DMA Xfer */
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down_read(¤t->mm->mmap_sem);
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y_pages = get_user_pages(current, current->mm, y_dma.uaddr, y_dma.page_count, 0, 1, &dma->map[0], NULL);
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y_pages = get_user_pages_unlocked(current, current->mm,
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y_dma.uaddr, y_dma.page_count, 0, 1,
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&dma->map[0]);
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uv_pages = 0; /* silence gcc. value is set and consumed only if: */
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if (y_pages == y_dma.page_count) {
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uv_pages = get_user_pages(current, current->mm,
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uv_dma.uaddr, uv_dma.page_count, 0, 1,
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&dma->map[y_pages], NULL);
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uv_pages = get_user_pages_unlocked(current, current->mm,
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uv_dma.uaddr, uv_dma.page_count, 0, 1,
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&dma->map[y_pages]);
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}
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up_read(¤t->mm->mmap_sem);
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if (y_pages != y_dma.page_count || uv_pages != uv_dma.page_count) {
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int rc = -EFAULT;
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