linux-kernel - [PATCH 03/26] dma: Use get_user_pages_fast() in dma_pin_iovec

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Date:	Wed,  2 Oct 2013 16:27:44 +0200
From:	Jan Kara <jack@...e.cz>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	linux-mm@...ck.org, Jan Kara <jack@...e.cz>,
	Dan Williams <dan.j.williams@...el.com>
Subject: [PATCH 03/26] dma: Use get_user_pages_fast() in dma_pin_iovec_pages()

CC: Dan Williams <dan.j.williams@...el.com>
Signed-off-by: Jan Kara <jack@...e.cz>
---
 drivers/dma/iovlock.c | 15 ++++-----------
 1 file changed, 4 insertions(+), 11 deletions(-)

diff --git a/drivers/dma/iovlock.c b/drivers/dma/iovlock.c
index bb48a57c2fc1..8b16332da8a9 100644
--- a/drivers/dma/iovlock.c
+++ b/drivers/dma/iovlock.c
@@ -95,17 +95,10 @@ struct dma_pinned_list *dma_pin_iovec_pages(struct iovec *iov, size_t len)
 		pages += page_list->nr_pages;
 
 		/* pin pages down */
-		down_read(&current->mm->mmap_sem);
-		ret = get_user_pages(
-			current,
-			current->mm,
-			(unsigned long) iov[i].iov_base,
-			page_list->nr_pages,
-			1,	/* write */
-			0,	/* force */
-			page_list->pages,
-			NULL);
-		up_read(&current->mm->mmap_sem);
+		ret = get_user_pages_fast((unsigned long) iov[i].iov_base,
+					  page_list->nr_pages,
+					  1,	/* write */
+					  page_list->pages);
 
 		if (ret != page_list->nr_pages)
 			goto unpin;
-- 
1.8.1.4

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/