linux-kernel - [PATCH 05/26] omap3isp: Make isp_video_buffer_prepare_user() use get_user_pages

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Message-Id: <1380724087-13927-6-git-send-email-jack@suse.cz>
Date:	Wed,  2 Oct 2013 16:27:46 +0200
From:	Jan Kara <jack@...e.cz>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	linux-mm@...ck.org, Jan Kara <jack@...e.cz>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	linux-media@...r.kernel.org
Subject: [PATCH 05/26] omap3isp: Make isp_video_buffer_prepare_user() use get_user_pages_fast()

CC: Laurent Pinchart <laurent.pinchart@...asonboard.com>
CC: linux-media@...r.kernel.org
Signed-off-by: Jan Kara <jack@...e.cz>
---
 drivers/media/platform/omap3isp/ispqueue.c | 10 +++-------
 1 file changed, 3 insertions(+), 7 deletions(-)

diff --git a/drivers/media/platform/omap3isp/ispqueue.c b/drivers/media/platform/omap3isp/ispqueue.c
index e15f01342058..bed380395e6c 100644
--- a/drivers/media/platform/omap3isp/ispqueue.c
+++ b/drivers/media/platform/omap3isp/ispqueue.c
@@ -331,13 +331,9 @@ static int isp_video_buffer_prepare_user(struct isp_video_buffer *buf)
 	if (buf->pages == NULL)
 		return -ENOMEM;
 
-	down_read(&current->mm->mmap_sem);
-	ret = get_user_pages(current, current->mm, data & PAGE_MASK,
-			     buf->npages,
-			     buf->vbuf.type == V4L2_BUF_TYPE_VIDEO_CAPTURE, 0,
-			     buf->pages, NULL);
-	up_read(&current->mm->mmap_sem);
-
+	ret = get_user_pages_fast(data & PAGE_MASK, buf->npages,
+				  buf->vbuf.type == V4L2_BUF_TYPE_VIDEO_CAPTURE,
+				  buf->pages);
 	if (ret != buf->npages) {
 		buf->npages = ret < 0 ? 0 : ret;
 		isp_video_buffer_cleanup(buf);
-- 
1.8.1.4

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