USB: cdc-acm: fix TIOCMIWAIT

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")
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Johan Hovold <johan@kernel.org>
Acked-by: Oliver Neukum <oneukum@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c
index 4ad4ca4..fada988 100644 (file)
--- a/drivers/usb/class/cdc-acm.c
+++ b/drivers/usb/class/cdc-acm.c
@@ -932,8 +932,6 @@ static int wait_serial_change(struct acm *acm, unsigned long arg)
        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;