This bug is still there in linux-next. What's the story, Andreas?
regards,
dan carpenter
On Thu, Jan 23, 2014 at 07:19:57PM +0300, Dan Carpenter wrote:
> Hello Andreas Larsson,
>
> The patch 27e9dcc924e9: "usb: gadget: Add UDC driver for Aeroflex
> Gaisler GRUSBDC" from Dec 23, 2013, leads to the following static
> checker warning:
>
> drivers/usb/gadget/gr_udc.c:1994 gr_ep_init()
> error: scheduling with locks held: 'spin_lock:lock'
>
> drivers/usb/gadget/gr_udc.c
> 1991 INIT_LIST_HEAD(&ep->queue);
> 1992
> 1993 if (num == 0) {
> 1994 _req = gr_alloc_request(&ep->ep, GFP_KERNEL);
> ^^^^^^^^^^
> GFP_ATOMIC?
>
> 1995 buf = devm_kzalloc(dev->dev, PAGE_SIZE, GFP_DMA | GFP_KERNEL);
> ^^^^^^^^^^^^^^^^^^^^
> This allocation can sleep as well. We're not allowed to sleep if we're
> holding a spinlock.
>
> 1996 if (!_req || !buf) {
> 1997 /* possible _req freed by gr_probe via gr_remove */
> 1998 return -ENOMEM;
> 1999 }
> 2000
> 2001 req = container_of(_req, struct gr_request, req);
> 2002 req->req.buf = buf;
> 2003 req->req.length = MAX_CTRL_PL_SIZE;
>
> The call tree is:
> gr_probe() <- takes the spinlock
> -> gr_udc_init()
> -> gr_ep_init() <-- sleeps
>
> regards,
> dan carpenter
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