linux-kernel - Re: [PATCH] usb: gadget: Check for NULL pointer in disconnect

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Message-ID: <20150324163008.GB31024@saruman.tx.rr.com>
Date:	Tue, 24 Mar 2015 11:30:08 -0500
From:	Felipe Balbi <balbi@...com>
To:	Badhri Jagan Sridharan <badhri@...gle.com>
CC:	Peter Chen <peter.chen@...escale.com>, Felipe Balbi <balbi@...com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	<linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] usb: gadget: Check for NULL pointer in disconnect

On Mon, Mar 23, 2015 at 04:00:37PM -0700, Badhri Jagan Sridharan wrote:
> > Do you really see some udc drivers call it after composite_unbind is
> > called? If it is, you may add dump_stack() to track that error.
> >
> > Besides this, function suspended_show is needed to add cdev NULL pointer
> > checking.
> 
> We see this happening occasionally in *not yet* upstreamed UDC
> code of some vendors (Yes, disconnect being called after unbind)

fix your UDC. We leave these sort of thing open so people realise they
have to fix their drivers.

-- 
balbi

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