On Mon, Mar 25, 2013 at 2:06 AM, Ben Hutchings <ben@xxxxxxxxxxxxxxx> wrote:
> 3.2-stable review patch. If anyone has any objections, please let me know.
This patch is incorrect as the wait-queue initialisation is missing. A
fix has been posted to linux-usb:
http://marc.info/?l=linux-usb&m=136428758202815&w=2
and should show up in 3.9-rc5. This patch and the following
use-after-free patches should not be applied without that fix.
Johan
> ------------------
>
> From: Johan Hovold <jhovold@xxxxxxxxx>
>
> 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@xxxxxxxxx>
> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
> Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
> ---
> include/linux/usb/serial.h | 2 ++
> 1 file changed, 2 insertions(+)
>
> --- 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;
>
>
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