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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>
This commit is contained in:
Tejun Heo 2008-09-24 16:22:23 -05:00 committed by Eric Van Hensbergen
parent 571ffeafff
commit ec3c68f232
1 changed files with 3 additions and 11 deletions
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14
net/9p/trans_fd.c
View File

@ -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;
}