linux-kernel - [PATCH 09/26] crystalhd: Convert crystalhd_map_dio() to use get_user_pages

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Date:	Wed,  2 Oct 2013 16:27:50 +0200
From:	Jan Kara <jack@...e.cz>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	linux-mm@...ck.org, Jan Kara <jack@...e.cz>,
	Naren Sankar <nsankar@...adcom.com>,
	Jarod Wilson <jarod@...sonet.com>,
	Scott Davilla <davilla@....com>,
	Manu Abraham <abraham.manu@...il.com>
Subject: [PATCH 09/26] crystalhd: Convert crystalhd_map_dio() to use get_user_pages_fast()

CC: Naren Sankar <nsankar@...adcom.com>
CC: Jarod Wilson <jarod@...sonet.com>
CC: Scott Davilla <davilla@....com>
CC: Manu Abraham <abraham.manu@...il.com>
Signed-off-by: Jan Kara <jack@...e.cz>
---
 drivers/staging/crystalhd/crystalhd_misc.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/drivers/staging/crystalhd/crystalhd_misc.c b/drivers/staging/crystalhd/crystalhd_misc.c
index 51f698052aff..f2d350985e46 100644
--- a/drivers/staging/crystalhd/crystalhd_misc.c
+++ b/drivers/staging/crystalhd/crystalhd_misc.c
@@ -751,10 +751,7 @@ enum BC_STATUS crystalhd_map_dio(struct crystalhd_adp *adp, void *ubuff,
 		}
 	}
 
-	down_read(&current->mm->mmap_sem);
-	res = get_user_pages(current, current->mm, uaddr, nr_pages, rw == READ,
-			     0, dio->pages, NULL);
-	up_read(&current->mm->mmap_sem);
+	res = get_user_pages_fast(uaddr, nr_pages, rw == READ, dio->pages);
 
 	/* Save for release..*/
 	dio->sig = crystalhd_dio_locked;
-- 
1.8.1.4

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