This is a note to let you know that I've just added the patch titled USB: cdc-acm: fix TIOCMIWAIT to the 4.4-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-tiocmiwait.patch and it can be found in the queue-4.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 18266403f3fe507f0246faa1d5432333a2f139ca Mon Sep 17 00:00:00 2001 From: Johan Hovold <johan@xxxxxxxxxx> Date: Tue, 8 Nov 2016 13:10:57 +0100 Subject: USB: cdc-acm: fix TIOCMIWAIT From: Johan Hovold <johan@xxxxxxxxxx> 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@xxxxxxxxxx> Acked-by: Oliver Neukum <oneukum@xxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- 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 @@ -877,8 +877,6 @@ 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@xxxxxxxxxx are queue-4.4/usb-cdc-acm-fix-tiocmiwait.patch -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html