linux-kernel - [PATCH 08/26] ced1401: Convert driver to use get_user_pages

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Date:	Wed,  2 Oct 2013 16:27:49 +0200
From:	Jan Kara <jack@...e.cz>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	linux-mm@...ck.org, Jan Kara <jack@...e.cz>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: [PATCH 08/26] ced1401: Convert driver to use get_user_pages_fast()

CC: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Jan Kara <jack@...e.cz>
---
 drivers/staging/ced1401/ced_ioc.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/drivers/staging/ced1401/ced_ioc.c b/drivers/staging/ced1401/ced_ioc.c
index 2dbaf39e2fc2..62efd74b8c04 100644
--- a/drivers/staging/ced1401/ced_ioc.c
+++ b/drivers/staging/ced1401/ced_ioc.c
@@ -692,10 +692,7 @@ static int SetArea(DEVICE_EXTENSION *pdx, int nArea, char __user *puBuf,
 		__func__, puBuf, dwLength, bCircular);
 
 	/*  To pin down user pages we must first acquire the mapping semaphore. */
-	down_read(&current->mm->mmap_sem);	/*  get memory map semaphore */
-	nPages = get_user_pages(current, current->mm, ulStart, len, 1, 0,
-				pPages, NULL);
-	up_read(&current->mm->mmap_sem);	/*  release the semaphore */
+	nPages = get_user_pages_fast(ulStart, len, 1, pPages);
 	dev_dbg(&pdx->interface->dev, "%s nPages = %d", __func__, nPages);
 
 	if (nPages > 0) {		/*  if we succeeded */
-- 
1.8.1.4

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