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[5/7] IB/mthca: Convert mthca_map_user_db() to use get_user_pages_fast()

Message ID 1444123470-4932-6-git-send-email-jack@suse.com (mailing list archive)
State Not Applicable
Headers show

Commit Message

Jan Kara Oct. 6, 2015, 9:24 a.m. UTC 
From: Jan Kara <jack@suse.cz>

Function mthca_map_user_db() appears to call get_user_pages() without
holding mmap_sem. Fix the bug by using get_user_pages_fast() instead
which also takes care of the locking.

CC: Roland Dreier <roland@kernel.org>
CC: linux-rdma@vger.kernel.org
Signed-off-by: Jan Kara <jack@suse.cz>
---
 drivers/infiniband/hw/mthca/mthca_memfree.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)
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Patch

diff --git a/drivers/infiniband/hw/mthca/mthca_memfree.c b/drivers/infiniband/hw/mthca/mthca_memfree.c
index 7d2e42dd6926..c3543b27a2a7 100644
--- a/drivers/infiniband/hw/mthca/mthca_memfree.c
+++ b/drivers/infiniband/hw/mthca/mthca_memfree.c
@@ -472,8 +472,7 @@  int mthca_map_user_db(struct mthca_dev *dev, struct mthca_uar *uar,
 		goto out;
 	}
 
-	ret = get_user_pages(current, current->mm, uaddr & PAGE_MASK, 1, 1, 0,
-			     pages, NULL);
+	ret = get_user_pages_fast(uaddr & PAGE_MASK, 1, 1, pages);
 	if (ret < 0)
 		goto out;