linux-kernel - [PATCH 04/26] drm: Convert via driver to use get_user_pages

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Date:	Wed,  2 Oct 2013 16:27:45 +0200
From:	Jan Kara <jack@...e.cz>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	linux-mm@...ck.org, Jan Kara <jack@...e.cz>,
	David Airlie <airlied@...ux.ie>,
	dri-devel@...ts.freedesktop.org
Subject: [PATCH 04/26] drm: Convert via driver to use get_user_pages_fast()

CC: David Airlie <airlied@...ux.ie>
CC: dri-devel@...ts.freedesktop.org
Signed-off-by: Jan Kara <jack@...e.cz>
---
 drivers/gpu/drm/via/via_dmablit.c | 12 ++++--------
 1 file changed, 4 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/via/via_dmablit.c b/drivers/gpu/drm/via/via_dmablit.c
index 8b0f25904e6d..7e3766667d78 100644
--- a/drivers/gpu/drm/via/via_dmablit.c
+++ b/drivers/gpu/drm/via/via_dmablit.c
@@ -238,14 +238,10 @@ via_lock_all_dma_pages(drm_via_sg_info_t *vsg,  drm_via_dmablit_t *xfer)
 	vsg->pages = vzalloc(sizeof(struct page *) * vsg->num_pages);
 	if (NULL == vsg->pages)
 		return -ENOMEM;
-	down_read(&current->mm->mmap_sem);
-	ret = get_user_pages(current, current->mm,
-			     (unsigned long)xfer->mem_addr,
-			     vsg->num_pages,
-			     (vsg->direction == DMA_FROM_DEVICE),
-			     0, vsg->pages, NULL);
-
-	up_read(&current->mm->mmap_sem);
+	ret = get_user_pages_fast((unsigned long)xfer->mem_addr,
+				  vsg->num_pages,
+				  (vsg->direction == DMA_FROM_DEVICE),
+				  vsg->pages);
 	if (ret != vsg->num_pages) {
 		if (ret < 0)
 			return ret;
-- 
1.8.1.4

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