From 0b176ce3a7cbfa92eceddf3896f1a504877d974a Mon Sep 17 00:00:00 2001 From: Peter Hurley Date: Tue, 5 Mar 2013 06:09:06 +0000 Subject: [PATCH] net/irda: Use barrier to set task state Without a memory and compiler barrier, the task state change can migrate relative to the condition testing in a blocking loop. However, the task state change must be visible across all cpus prior to testing those conditions. Failing to do this can result in the familiar 'lost wakeup' and this task will hang until killed. Signed-off-by: Peter Hurley Signed-off-by: David S. Miller --- net/irda/ircomm/ircomm_tty.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/irda/ircomm/ircomm_tty.c b/net/irda/ircomm/ircomm_tty.c index d282bbea710e..522543d9264a 100644 --- a/net/irda/ircomm/ircomm_tty.c +++ b/net/irda/ircomm/ircomm_tty.c @@ -324,7 +324,7 @@ static int ircomm_tty_block_til_ready(struct ircomm_tty_cb *self, if (tty->termios.c_cflag & CBAUD) tty_port_raise_dtr_rts(port); - current->state = TASK_INTERRUPTIBLE; + set_current_state(TASK_INTERRUPTIBLE); if (tty_hung_up_p(filp) || !test_bit(ASYNCB_INITIALIZED, &port->flags)) { -- 2.20.1