diff options
| author | Johan Hovold <jhovold@gmail.com> | 2013-03-19 09:21:10 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-04-05 09:26:03 -0700 |
| commit | 86be053a795c17acaa6721dcc501a876368fd9d4 (patch) | |
| tree | 144dd8cdb0e0f6a04ac590811e8eae5c19729269 /include | |
| parent | 795dae3bdf2ecd7d325264e5527c76a647590f43 (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>
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 ef9be7e1e190..1819b59aab2a 100644 --- a/include/linux/usb/serial.h +++ b/include/linux/usb/serial.h @@ -66,6 +66,7 @@ * 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 @@ -112,6 +113,7 @@ 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; |