Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [PATCH 4.4 15/38] USB: cdc-acm: fix TIOCMIWAIT | Date | Thu, 17 Nov 2016 11:32:53 +0100 |
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4.4-stable review patch. If anyone has any objections, please let me know.
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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 @@ -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;
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