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USB: cdc-acm: fix TIOCMIWAIT

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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: 5a6a62bdb9 ("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>
This commit is contained in:
Johan Hovold 2016-11-08 13:10:57 +01:00 committed by Greg Kroah-Hartman
parent 7309aa847e
commit 18266403f3
1 changed files with 0 additions and 2 deletions
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2
drivers/usb/class/cdc-acm.c
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@ -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;