From 670986ec01c1129db114b7720826a80756c7e899 Mon Sep 17 00:00:00 2001
From: Christoph Hellwig <hch@lst.de>
Date: Fri, 1 Sep 2017 17:39:18 +0200
Subject: [PATCH] net/9p: switch p9_fd_read to kernel_write
Instead of playing with the addressing limits.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
net/9p/trans_fd.c | 10 ++--------
1 file changed, 2 insertions(+), 8 deletions(-)
diff --git a/net/9p/trans_fd.c b/net/9p/trans_fd.c
index f12815777beb..903a190319b9 100644
--- a/net/9p/trans_fd.c
+++ b/net/9p/trans_fd.c
@@ -422,8 +422,7 @@ error:
static int p9_fd_write(struct p9_client *client, void *v, int len)
{
- int ret;
- mm_segment_t oldfs;
+ ssize_t ret;
struct p9_trans_fd *ts = NULL;
if (client && client->status != Disconnected)
@@ -435,12 +434,7 @@ static int p9_fd_write(struct p9_client *client, void *v, int len)
if (!(ts->wr->f_flags & O_NONBLOCK))
p9_debug(P9_DEBUG_ERROR, "blocking write ...\n");
- oldfs = get_fs();
- set_fs(get_ds());
- /* The cast to a user pointer is valid due to the set_fs() */
- ret = vfs_write(ts->wr, (__force void __user *)v, len, &ts->wr->f_pos);
- set_fs(oldfs);
-
+ ret = kernel_write(ts->wr, v, len, &ts->wr->f_pos);
if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN)
client->status = Disconnected;
return ret;