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USB: sierra: fix AA deadlock in open error path

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Fix AA deadlock in open error path that would call close() and try to
grab the already held disc_mutex.

Fixes: b9a44bc19f ("sierra: driver urb handling improvements")

Cc: <stable@vger.kernel.org>	# v2.6.31
Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Johan Hovold 2014-05-26 19:22:50 +02:00 committed by Greg Kroah-Hartman
parent 549e83500b
commit 353fe19860
1 changed files with 13 additions and 8 deletions
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21
drivers/usb/serial/sierra.c
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@ -816,14 +816,9 @@ static int sierra_open(struct tty_struct *tty, struct usb_serial_port *port)
usb_sndbulkpipe(serial->dev, endpoint) | USB_DIR_IN);
err = sierra_submit_rx_urbs(port, GFP_KERNEL);
if (err) {
/* get rid of everything as in close */
sierra_close(port);
/* restore balance for autopm */
if (!serial->disconnected)
usb_autopm_put_interface(serial->interface);
return err;
}
if (err)
goto err_submit;
sierra_send_setup(port);
serial->interface->needs_remote_wakeup = 1;
@ -833,6 +828,16 @@ static int sierra_open(struct tty_struct *tty, struct usb_serial_port *port)
usb_autopm_put_interface(serial->interface);
return 0;
err_submit:
sierra_stop_rx_urbs(port);
for (i = 0; i < portdata->num_in_urbs; i++) {
sierra_release_urb(portdata->in_urbs[i]);
portdata->in_urbs[i] = NULL;
}
return err;
}