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USB: serial: add modem-status-change wait queue

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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).

Cc: stable <stable@vger.kernel.org>
Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Johan Hovold 2013-03-19 09:21:10 +01:00 committed by Greg Kroah-Hartman
parent d7971051e4
commit e5b33dc9d1
1 changed files with 2 additions and 0 deletions
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2
include/linux/usb/serial.h
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@ -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;