linux-kernel - [ 66/69] usb: cdc-acm: fix devices not unthrottled on open

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Message-Id: <20120617175950.955142805@decadent.org.uk>
Date:	Sun, 17 Jun 2012 19:00:47 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk,
	Otto Meta <otto.patches@...ter-shadow.de>,
	Johan Hovold <jhovold@...il.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: [ 66/69] usb: cdc-acm: fix devices not unthrottled on open

3.2-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Otto Meta <otto.patches@...ter-shadow.de>

commit 6c4707f3f8c44ec18282e1c014c80e1c257042f9 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@...ter-shadow.de>
Acked-by: Johan Hovold <jhovold@...il.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/usb/class/cdc-acm.c |    8 ++++++++
 1 file changed, 8 insertions(+)

--- a/drivers/usb/class/cdc-acm.c
+++ b/drivers/usb/class/cdc-acm.c
@@ -498,6 +498,14 @@
 
 	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;
 


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