[PATCH 04/10] cdc-acm: remove dead code
in [Kernel]
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From: Arnd Bergmann on 15 May 2010 17:10 The wait_event_interruptible_timeout in acm_port_down is never reached. Remove it to avoid possible deadlocks with the big tty mutex if someone were to start using the blocking version of acm_port_down. Signed-off-by: Arnd Bergmann <arnd(a)arndb.de> --- drivers/usb/class/cdc-acm.c | 12 +++--------- 1 files changed, 3 insertions(+), 9 deletions(-) diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c index 5e1a253..7b50bf5 100644 --- a/drivers/usb/class/cdc-acm.c +++ b/drivers/usb/class/cdc-acm.c @@ -636,19 +636,13 @@ static void acm_tty_unregister(struct acm *acm) static int acm_tty_chars_in_buffer(struct tty_struct *tty); -static void acm_port_down(struct acm *acm, int drain) +static void acm_port_down(struct acm *acm) { int i, nr = acm->rx_buflimit; mutex_lock(&open_mutex); if (acm->dev) { usb_autopm_get_interface(acm->control); acm_set_control(acm, acm->ctrlout = 0); - /* try letting the last writes drain naturally */ - if (drain) { - wait_event_interruptible_timeout(acm->drain_wait, - (ACM_NW == acm_wb_is_avail(acm)) || !acm->dev, - ACM_CLOSE_TIMEOUT * HZ); - } usb_kill_urb(acm->ctrlurb); for (i = 0; i < ACM_NW; i++) usb_kill_urb(acm->wb[i].urb); @@ -664,7 +658,7 @@ static void acm_tty_hangup(struct tty_struct *tty) { struct acm *acm = tty->driver_data; tty_port_hangup(&acm->port); - acm_port_down(acm, 0); + acm_port_down(acm); } static void acm_tty_close(struct tty_struct *tty, struct file *filp) @@ -685,7 +679,7 @@ static void acm_tty_close(struct tty_struct *tty, struct file *filp) mutex_unlock(&open_mutex); return; } - acm_port_down(acm, 0); + acm_port_down(acm); tty_port_close_end(&acm->port, tty); tty_port_tty_set(&acm->port, NULL); } -- 1.7.0.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ |