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authorPeter Hurley <peter@hurleysoftware.com>2013-03-05 06:09:06 +0000
committerDavid S. Miller <davem@davemloft.net>2013-03-06 02:47:04 -0500
commit0b176ce3a7cbfa92eceddf3896f1a504877d974a (patch)
treefe3b0e5154f51ba4a8a87dc6bd4dbd00e47270b6 /net/irda/ircomm
parent2f7c069b96ed7b1f6236f2fa7b0bc06f4f54f2d9 (diff)
downloadlinux-0b176ce3a7cbfa92eceddf3896f1a504877d974a.tar.gz
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 <peter@hurleysoftware.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/irda/ircomm')
-rw-r--r--net/irda/ircomm/ircomm_tty.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/net/irda/ircomm/ircomm_tty.c b/net/irda/ircomm/ircomm_tty.c
index d282bbea710..522543d9264 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)) {