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Input: xpad - ensure xpad->bulk_out is initialized before submitting urb 

As pointed out by Oliver Neukum:
xpad->irq_in is currently submitted before xpad->bulk_out is allocated.
That however is a race, because the callback for irq_in can call
xpad360w_process_packet(), which will in turn submit the bulk URB.

This patch moves initialization for xpad->bulk_out earlier, so we can
ensure xpad->bulk_out is initialized before submitting urb.

Signed-off-by: Axel Lin <axel.lin@gmail.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
This commit is contained in:
Axel Lin 2010-11-17 23:59:34 -08:00 committed by Dmitry Torokhov
parent 20a4c261ad
commit e3f0f0a6c1
1 changed files with 16 additions and 16 deletions
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32
drivers/input/joystick/xpad.c
View File

@ -921,19 +921,7 @@ static int xpad_probe(struct usb_interface *intf, const struct usb_device_id *id
usb_set_intfdata(intf, xpad);
/*
* Submit the int URB immediately rather than waiting for open
* because we get status messages from the device whether
* or not any controllers are attached. In fact, it's
* exactly the message that a controller has arrived that
* we're waiting for.
*/
if (xpad->xtype == XTYPE_XBOX360W) {
xpad->irq_in->dev = xpad->udev;
error = usb_submit_urb(xpad->irq_in, GFP_KERNEL);
if (error)
goto fail7;
/*
* Setup the message to set the LEDs on the
* controller when it shows up
@ -941,13 +929,13 @@ static int xpad_probe(struct usb_interface *intf, const struct usb_device_id *id
xpad->bulk_out = usb_alloc_urb(0, GFP_KERNEL);
if (!xpad->bulk_out) {
error = -ENOMEM;
goto fail8;
goto fail7;
}
xpad->bdata = kzalloc(XPAD_PKT_LEN, GFP_KERNEL);
if (!xpad->bdata) {
error = -ENOMEM;
goto fail9;
goto fail8;
}
xpad->bdata[2] = 0x08;
@ -969,12 +957,24 @@ static int xpad_probe(struct usb_interface *intf, const struct usb_device_id *id
usb_fill_bulk_urb(xpad->bulk_out, udev,
usb_sndbulkpipe(udev, ep_irq_in->bEndpointAddress),
xpad->bdata, XPAD_PKT_LEN, xpad_bulk_out, xpad);
/*
* Submit the int URB immediately rather than waiting for open
* because we get status messages from the device whether
* or not any controllers are attached. In fact, it's
* exactly the message that a controller has arrived that
* we're waiting for.
*/
xpad->irq_in->dev = xpad->udev;
error = usb_submit_urb(xpad->irq_in, GFP_KERNEL);
if (error)
goto fail9;
}
return 0;
fail9: usb_free_urb(xpad->bulk_out);
fail8: usb_kill_urb(xpad->irq_in);
fail9: kfree(xpad->bdata);
fail8: usb_free_urb(xpad->bulk_out);
fail7: input_unregister_device(input_dev);
input_dev = NULL;
fail6: xpad_led_disconnect(xpad);