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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/scsi
parenta7b780750e1a1c7833812681e1f8fa30bbb06802 (diff)
downloadlinux-7e339128496284cc21977fba5416166ee81f5172.tar.bz2
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/scsi')
-rw-r--r--drivers/scsi/st.c7
1 files changed, 2 insertions, 5 deletions
diff --git a/drivers/scsi/st.c b/drivers/scsi/st.c
index 128d3b55bdd9..9a1c34205254 100644
--- a/drivers/scsi/st.c
+++ b/drivers/scsi/st.c
@@ -4551,18 +4551,15 @@ static int sgl_map_user_pages(struct st_buffer *STbp,
return -ENOMEM;
/* Try to fault in all of the necessary pages */
- down_read(&current->mm->mmap_sem);
/* rw==READ means read from drive, write into memory area */
- res = get_user_pages(
+ res = get_user_pages_unlocked(
current,
current->mm,
uaddr,
nr_pages,
rw == READ,
0, /* don't force */
- pages,
- NULL);
- up_read(&current->mm->mmap_sem);
+ pages);
/* Errors and no page mapped should return here */
if (res < nr_pages)