From: Tejun Heo <tj@kernel.org>
Date: Wed, 24 Sep 2008 21:22:23 +0000 (-0500)
Subject: 9p-trans_fd: don't do fs segment mangling in p9_fd_poll()
X-Git-Tag: v2.6.27-rc8~25^2~4
X-Git-Url: http://pilppa.com/gitweb/?a=commitdiff_plain;h=ec3c68f232f6d98b4596c05c1c7551b44c617c5f;p=linux-2.6-omap-h63xx.git

9p-trans_fd: don't do fs segment mangling in p9_fd_poll()

p9_fd_poll() is never called with user pointers and f_op->poll()
doesn't expect its arguments to be from userland.  There's no need to
set kernel ds before calling f_op->poll() from p9_fd_poll().  Remove
it.

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
---

diff --git a/net/9p/trans_fd.c b/net/9p/trans_fd.c
index 6c88e898375..f6d4af16cb1 100644
--- a/net/9p/trans_fd.c
+++ b/net/9p/trans_fd.c
@@ -1344,7 +1344,6 @@ p9_fd_poll(struct p9_trans *trans, struct poll_table_struct *pt)
 {
 	int ret, n;
 	struct p9_trans_fd *ts = NULL;
-	mm_segment_t oldfs;
 
 	if (trans && trans->status == Connected)
 		ts = trans->priv;
@@ -1358,24 +1357,17 @@ p9_fd_poll(struct p9_trans *trans, struct poll_table_struct *pt)
 	if (!ts->wr->f_op || !ts->wr->f_op->poll)
 		return -EIO;
 
-	oldfs = get_fs();
-	set_fs(get_ds());
-
 	ret = ts->rd->f_op->poll(ts->rd, pt);
 	if (ret < 0)
-		goto end;
+		return ret;
 
 	if (ts->rd != ts->wr) {
 		n = ts->wr->f_op->poll(ts->wr, pt);
-		if (n < 0) {
-			ret = n;
-			goto end;
-		}
+		if (n < 0)
+			return n;
 		ret = (ret & ~POLLOUT) | (n & ~POLLIN);
 	}
 
-end:
-	set_fs(oldfs);
 	return ret;
 }