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authorRalf Baechle <ralf@linux-mips.org>2006-12-13 03:34:57 -0500
committerLinus Torvalds <torvalds@woody.osdl.org>2006-12-13 12:05:52 -0500
commit34f8f0a5e953d3e40c4419e5e5c4b6fd14f7ebf2 (patch)
tree6a4630fc8ca0ee9d49e7411e992a4b16ee2ca282
parentcd86128088554d64fea1679191509f00e6353c5b (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>
-rw-r--r--drivers/char/n_tty.c1
1 files changed, 0 insertions, 1 deletions
diff --git a/drivers/char/n_tty.c b/drivers/char/n_tty.c
index e96a00fe1389..2bdb0144a22e 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);