diff options
author | Ralf Baechle <ralf@linux-mips.org> | 2006-12-13 03:34:57 -0500 |
---|---|---|
committer | Linus Torvalds <torvalds@woody.osdl.org> | 2006-12-13 12:05:52 -0500 |
commit | 34f8f0a5e953d3e40c4419e5e5c4b6fd14f7ebf2 (patch) | |
tree | 6a4630fc8ca0ee9d49e7411e992a4b16ee2ca282 /drivers/char | |
parent | cd86128088554d64fea1679191509f00e6353c5b (diff) |
[PATCH] tty: remove useless memory barrier
I don't see why there is a memory barrier in copy_from_read_buf() at all.
Even if it was useful spin_unlock_irqrestore implies a barrier.
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'drivers/char')
-rw-r--r-- | drivers/char/n_tty.c | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/drivers/char/n_tty.c b/drivers/char/n_tty.c index e96a00fe138..2bdb0144a22 100644 --- a/drivers/char/n_tty.c +++ b/drivers/char/n_tty.c | |||
@@ -1151,7 +1151,6 @@ static int copy_from_read_buf(struct tty_struct *tty, | |||
1151 | n = min(*nr, n); | 1151 | n = min(*nr, n); |
1152 | spin_unlock_irqrestore(&tty->read_lock, flags); | 1152 | spin_unlock_irqrestore(&tty->read_lock, flags); |
1153 | if (n) { | 1153 | if (n) { |
1154 | mb(); | ||
1155 | retval = copy_to_user(*b, &tty->read_buf[tty->read_tail], n); | 1154 | retval = copy_to_user(*b, &tty->read_buf[tty->read_tail], n); |
1156 | n -= retval; | 1155 | n -= retval; |
1157 | spin_lock_irqsave(&tty->read_lock, flags); | 1156 | spin_lock_irqsave(&tty->read_lock, flags); |