linux-kernel - [PATCH 07/26] st: Convert sgl_map_user_pages() to use get_user_pages

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Message-Id: <1380724087-13927-8-git-send-email-jack@suse.cz>
Date:	Wed,  2 Oct 2013 16:27:48 +0200
From:	Jan Kara <jack@...e.cz>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	linux-mm@...ck.org, Jan Kara <jack@...e.cz>,
	linux-scsi@...r.kernel.org, Kai Makisara <Kai.Makisara@...umbus.fi>
Subject: [PATCH 07/26] st: Convert sgl_map_user_pages() to use get_user_pages_fast()

CC: linux-scsi@...r.kernel.org
CC: Kai Makisara <Kai.Makisara@...umbus.fi>
Signed-off-by: Jan Kara <jack@...e.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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