diff options
| author | Johan Hovold <jhovold@gmail.com> | 2013-03-19 09:21:10 +0100 |
|---|---|---|
| committer | Ben Hutchings <ben@decadent.org.uk> | 2013-04-25 20:22:10 +0100 |
| commit | da07f4596510e8141e105c9502a25b568caba860 (patch) | |
| tree | 1a63ab428be6e8b06ea11d481b89843798a28ff2 /include | |
| parent | 93dfb878a5b870fb6a08e1c69d9046ebc4a4471e (diff) | |
USB: serial: add modem-status-change wait queue
commit e5b33dc9d16053c2ae4c2c669cf008829530364b upstream.
Add modem-status-change wait queue to struct usb_serial_port that
subdrivers can use to implement TIOCMIWAIT.
Currently subdrivers use a private wait queue which may have been
released when waking up after device disconnected.
Note that we're adding a new wait queue rather than reusing the tty-port
one as we do not want to get woken up at hangup (yet).
Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/usb/serial.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/usb/serial.h b/include/linux/usb/serial.h index b29f70b2ecae..237d5f8689f2 100644 --- a/include/linux/usb/serial.h +++ b/include/linux/usb/serial.h @@ -71,6 +71,7 @@ enum port_dev_state { * port. * @flags: usb serial port flags * @write_wait: a wait_queue_head_t used by the port. + * @delta_msr_wait: modem-status-change wait queue * @work: work queue entry for the line discipline waking up. * @throttled: nonzero if the read urb is inactive to throttle the device * @throttle_req: nonzero if the tty wants to throttle us @@ -114,6 +115,7 @@ struct usb_serial_port { unsigned long flags; wait_queue_head_t write_wait; + wait_queue_head_t delta_msr_wait; struct work_struct work; char throttled; char throttle_req; |