[PATCH 07/26] st: Convert sgl_map_user_pages() to use get_user_pages_fast()

[Jan Kara]

CC: linux-s...@vger.kernel.org
CC: Kai Makisara <kai.makis...@kolumbus.fi>
Signed-off-by: Jan Kara <j...@suse.cz>
---
 drivers/scsi/st.c | 18 +++++-------------
 1 file changed, 5 insertions(+), 13 deletions(-)

diff --git a/drivers/scsi/st.c b/drivers/scsi/st.c
index ff44b3c2cff2..ba11299c3740 100644
--- a/drivers/scsi/st.c
+++ b/drivers/scsi/st.c
@@ -4514,19 +4514,11 @@ static int sgl_map_user_pages(struct st_buffer *STbp,
        if ((pages = kmalloc(max_pages * sizeof(*pages), GFP_KERNEL)) == NULL)
                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(
-               current,
-               current->mm,
-               uaddr,
-               nr_pages,
-               rw == READ,
-               0, /* don't force */
-               pages,
-               NULL);
-       up_read(&current->mm->mmap_sem);
+        /*
+        * Try to fault in all of the necessary pages. rw==READ means read
+        * from drive, write into memory area.
+        */
+       res = get_user_pages_fast(uaddr, nr_pages, rw == READ, pages);
 
        /* Errors and no page mapped should return here */
        if (res < nr_pages)
-- 
1.8.1.4

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