We can avoid the unnecessary barrier on non LL/SC architectures, such as x86. Instead, use the smp_mb__after_atomic() call. Signed-off-by: Davidlohr Bueso <dbueso@xxxxxxx> --- drivers/usb/class/cdc-acm.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c index 62f4fb9b362f..0bc4b558f387 100644 --- a/drivers/usb/class/cdc-acm.c +++ b/drivers/usb/class/cdc-acm.c @@ -842,7 +842,7 @@ static void acm_tty_unthrottle(struct tty_struct *tty) clear_bit(ACM_THROTTLED, &acm->flags); /* Matches the smp_mb__after_atomic() in acm_read_bulk_callback(). */ - smp_mb(); + smp_mb__after_atomic(); acm_submit_read_urbs(acm, GFP_KERNEL); } -- 2.16.4
