From: Otto Meta <otto.patches@xxxxxxxxxxxxxxxx> Currently CDC-ACM devices stay throttled when their TTY is closed while throttled, stalling further communication attempts after the next open. Unthrottling during open/activate got lost starting with kernel 3.0.0 and this patch reintroduces it. Signed-off-by: Otto Meta <otto.patches@xxxxxxxxxxxxxxxx> Cc: <stable@xxxxxxxxxxxxxxx> --- All stable 3.x kernels are affected in addition to 3.5-rc1 and this patch works with all of them. --- linux-3.5-rc1.orig/drivers/usb/class/cdc-acm.c 2012-06-03 03:29:26.000000000 +0200 +++ linux-3.5-rc1/drivers/usb/class/cdc-acm.c 2012-06-06 12:59:20.725654552 +0200 @@ -567,6 +567,14 @@ static int acm_port_activate(struct tty_ usb_autopm_put_interface(acm->control); + /* + * Unthrottle device in case the TTY was closed while throttled. + */ + spin_lock_irq(&acm->read_lock); + acm->throttled = 0; + acm->throttle_req = 0; + spin_unlock_irq(&acm->read_lock); + if (acm_submit_read_urbs(acm, GFP_KERNEL)) goto error_submit_read_urbs; -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
