usb: cdc-acm: fix devices not unthrottled on open
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> Cc: stable <stable@vger.kernel.org> Acked-by: Johan Hovold <jhovold@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -567,6 +567,14 @@ static int acm_port_activate(struct tty_port *port, struct tty_struct *tty)
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usb_autopm_put_interface(acm->control);
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/*
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* Unthrottle device in case the TTY was closed while throttled.
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*/
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spin_lock_irq(&acm->read_lock);
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acm->throttled = 0;
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acm->throttle_req = 0;
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spin_unlock_irq(&acm->read_lock);
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if (acm_submit_read_urbs(acm, GFP_KERNEL))
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goto error_submit_read_urbs;
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