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USB: sierra: fix AA deadlock in open error path

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commit 353fe19860 upstream.

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")

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 8aa440e39e
commit ed8f24f670
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;
}