Patch "USB: cdc-acm: fix TIOCMIWAIT" has been added to the 4.8-stable tree

Patch "USB: cdc-acm: fix TIOCMIWAIT" has been added to the 4.8-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    USB: cdc-acm: fix TIOCMIWAIT

to the 4.8-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-tiocmiwait.patch
and it can be found in the queue-4.8 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 18266403f3fe507f0246faa1d5432333a2f139ca Mon Sep 17 00:00:00 2001
From: Johan Hovold <johan@kernel.org>
Date: Tue, 8 Nov 2016 13:10:57 +0100
Subject: USB: cdc-acm: fix TIOCMIWAIT

From: Johan Hovold <johan@kernel.org>

commit 18266403f3fe507f0246faa1d5432333a2f139ca upstream.

The TIOCMIWAIT implementation would return -EINVAL if any of the three
supported signals were included in the mask.

Instead of returning an error in case TIOCM_CTS is included, simply
drop the mask check completely, which is in accordance with how other
drivers implement this ioctl.

Fixes: 5a6a62bdb925 ("cdc-acm: add TIOCMIWAIT")
Signed-off-by: Johan Hovold <johan@kernel.org>
Acked-by: Oliver Neukum <oneukum@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/usb/class/cdc-acm.c |    2 --
 1 file changed, 2 deletions(-)

--- a/drivers/usb/class/cdc-acm.c
+++ b/drivers/usb/class/cdc-acm.c
@@ -946,8 +946,6 @@ static int wait_serial_change(struct acm
 	DECLARE_WAITQUEUE(wait, current);
 	struct async_icount old, new;
 
-	if (arg & (TIOCM_DSR | TIOCM_RI | TIOCM_CD))
-		return -EINVAL;
 	do {
 		spin_lock_irq(&acm->read_lock);
 		old = acm->oldcount;


Patches currently in stable-queue which might be from johan@kernel.org are

queue-4.8/usb-cdc-acm-fix-tiocmiwait.patch