linux-kernel - Re: 3.12.1 Virt dev invalid for slot

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Date:	Mon, 25 Nov 2013 06:31:54 -0800
From:	Greg KH <gregkh@...uxfoundation.org>
To:	Shuah Khan <shuah.kh@...sung.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"stable@...r.kernel.org" <stable@...r.kernel.org>,
	"shuahkhan@...il.com" <shuahkhan@...il.com>
Subject: Re: 3.12.1 Virt dev invalid for slot_id 0x1

On Thu, Nov 21, 2013 at 04:29:31PM -0700, Shuah Khan wrote:
> I started seeing the following on my Samsung Series on 3.12.1
> 
> Is this bad? Looks like the following WARN_ON is firing:
> 
> drivers/usb/host/xhci.c:
> 
>          if (WARN_ON(!virt_dev)) {
>                  /*
>                   * In plug/unplug torture test with an NEC controller,
>                   * a zero-dereference was observed once due to virt_dev 
> = 0.
>                   * Print useful debug rather than crash if it is 
> observed again!
>                   */
>                  xhci_warn(xhci, "Virt dev invalid for slot_id 0x%x!\n",
>                          udev->slot_id);
>                  return -EINVAL;
>          }

I suggest sending this to the linux-usb@...r mailing list and cc: the
xhci author/maintainer so they are aware of this.

thanks,

greg k-h
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