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authorAndrea Arcangeli <aarcange@redhat.com>2015-02-11 15:27:26 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2015-02-11 17:06:05 -0800
commit7e339128496284cc21977fba5416166ee81f5172 (patch)
tree6af95386953cc67f3f465b966e03cb56f184dd30 /drivers/media
parenta7b780750e1a1c7833812681e1f8fa30bbb06802 (diff)
downloadblackbird-obmc-linux-7e339128496284cc21977fba5416166ee81f5172.tar.gz
blackbird-obmc-linux-7e339128496284cc21977fba5416166ee81f5172.zip
mm: gup: use get_user_pages_unlocked
This allows those get_user_pages calls to pass FAULT_FLAG_ALLOW_RETRY to the page fault in order to release the mmap_sem during the I/O. Signed-off-by: Andrea Arcangeli <aarcange@redhat.com> Reviewed-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Cc: Andres Lagar-Cavilla <andreslc@google.com> Cc: Peter Feiner <pfeiner@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/media')
-rw-r--r--drivers/media/pci/ivtv/ivtv-udma.c6
1 files changed, 2 insertions, 4 deletions
diff --git a/drivers/media/pci/ivtv/ivtv-udma.c b/drivers/media/pci/ivtv/ivtv-udma.c
index bee2329e0b2e..24152accc66c 100644
--- a/drivers/media/pci/ivtv/ivtv-udma.c
+++ b/drivers/media/pci/ivtv/ivtv-udma.c
@@ -124,10 +124,8 @@ int ivtv_udma_setup(struct ivtv *itv, unsigned long ivtv_dest_addr,
}
/* Get user pages for DMA Xfer */
- down_read(&current->mm->mmap_sem);
- err = get_user_pages(current, current->mm,
- user_dma.uaddr, user_dma.page_count, 0, 1, dma->map, NULL);
- up_read(&current->mm->mmap_sem);
+ err = get_user_pages_unlocked(current, current->mm,
+ user_dma.uaddr, user_dma.page_count, 0, 1, dma->map);
if (user_dma.page_count != err) {
IVTV_DEBUG_WARN("failed to map user pages, returned %d instead of %d\n",
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