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[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>
This commit is contained in:
Ralf Baechle 2006-12-13 00:34:57 -08:00 committed by Linus Torvalds
parent cd86128088
commit 34f8f0a5e9
1 changed files with 0 additions and 1 deletions
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1
drivers/char/n_tty.c
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@ -1151,7 +1151,6 @@ static int copy_from_read_buf(struct tty_struct *tty,
n = min(*nr, n);
spin_unlock_irqrestore(&tty->read_lock, flags);
if (n) {
mb();
retval = copy_to_user(*b, &tty->read_buf[tty->read_tail], n);
n -= retval;
spin_lock_irqsave(&tty->read_lock, flags);