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USB: cdc-acm: fix shutdown and suspend race 

We should stop I/O unconditionally at suspend rather than rely on the
tty-port initialised flag (which is set prior to stopping I/O during
shutdown) in order to prevent suspend returning with URBs still active.

Fixes: 11ea859d64 ("USB: additional power savings for cdc-acm devices
that support remote wakeup")

Cc: <stable@vger.kernel.org>	# v2.6.27
Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
hifive-unleashed-5.1
Johan Hovold 2014-05-26 19:23:40 +02:00 committed by Greg Kroah-Hartman
parent bae3f4c535
commit ed79707403
1 changed files with 1 additions and 2 deletions
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3
drivers/usb/class/cdc-acm.c
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@ -1550,8 +1550,7 @@ static int acm_suspend(struct usb_interface *intf, pm_message_t message)
if (cnt)
return 0;
if (test_bit(ASYNCB_INITIALIZED, &acm->port.flags))
stop_data_traffic(acm);
stop_data_traffic(acm);
return 0;
}