This is a note to let you know that I've just added the patch titled
usb: cdc-acm: fix devices not unthrottled on open
to the 3.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
usb-cdc-acm-fix-devices-not-unthrottled-on-open.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From 6c4707f3f8c44ec18282e1c014c80e1c257042f9 Mon Sep 17 00:00:00 2001
From: Otto Meta <[email protected]>
Date: Wed, 6 Jun 2012 18:46:21 +0200
Subject: usb: cdc-acm: fix devices not unthrottled on open
From: Otto Meta <[email protected]>
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 <[email protected]>
Acked-by: Johan Hovold <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
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
@@ -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;
Patches currently in stable-queue which might be from
[email protected] are
queue-3.4/usb-cdc-acm-fix-devices-not-unthrottled-on-open.patch
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