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usb: cdc-acm: fix devices not unthrottled on open

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commit 6c4707f3f8 upstream.

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@sister-shadow.de>
Acked-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Otto Meta 2012-06-06 18:46:21 +02:00 committed by Greg Kroah-Hartman
parent 2c1a56c8c6
commit 94b71da919
1 changed files with 8 additions and 0 deletions
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8
drivers/usb/class/cdc-acm.c
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@ -498,6 +498,14 @@ static int acm_tty_open(struct tty_struct *tty, struct file *filp)
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 bail_out;