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cdc-acm: remove dead code

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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@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Arnd Bergmann 2010-06-01 22:53:04 +02:00 committed by Greg Kroah-Hartman
parent 83ceb67d7d
commit 4e60867167
1 changed files with 3 additions and 9 deletions
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12
drivers/usb/class/cdc-acm.c
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@ -636,19 +636,13 @@ static void acm_tty_unregister(struct acm *acm)
static int acm_tty_chars_in_buffer(struct tty_struct *tty); 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; int i, nr = acm->rx_buflimit;
mutex_lock(&open_mutex); mutex_lock(&open_mutex);
if (acm->dev) { if (acm->dev) {
usb_autopm_get_interface(acm->control); usb_autopm_get_interface(acm->control);
acm_set_control(acm, acm->ctrlout = 0); 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); usb_kill_urb(acm->ctrlurb);
for (i = 0; i < ACM_NW; i++) for (i = 0; i < ACM_NW; i++)
usb_kill_urb(acm->wb[i].urb); 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; struct acm *acm = tty->driver_data;
tty_port_hangup(&acm->port); 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) 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); mutex_unlock(&open_mutex);
return; return;
} }
acm_port_down(acm, 0); acm_port_down(acm);
tty_port_close_end(&acm->port, tty); tty_port_close_end(&acm->port, tty);
tty_port_tty_set(&acm->port, NULL); tty_port_tty_set(&acm->port, NULL);
} }