From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jan Kara Subject: [PATCH 25/26] ib: Convert mthca_map_user_db() to use get_user_pages_fast() Date: Wed, 2 Oct 2013 16:28:06 +0200 Message-ID: <1380724087-13927-26-git-send-email-jack@suse.cz> References: <1380724087-13927-1-git-send-email-jack@suse.cz> Return-path: In-Reply-To: <1380724087-13927-1-git-send-email-jack@suse.cz> Sender: owner-linux-mm@kvack.org To: LKML Cc: linux-mm@kvack.org, Jan Kara , Roland Dreier , linux-rdma@vger.kernel.org List-Id: linux-rdma@vger.kernel.org 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 CC: linux-rdma@vger.kernel.org Signed-off-by: Jan Kara --- drivers/infiniband/hw/mthca/mthca_memfree.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) 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; -- 1.8.1.4 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org