linux-kernel - Re: [lkp] [staging] 68905a14e49: kernel BUG at drivers/base/driver.c:153!

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Message-ID: <20150807180113.GC10282@kroah.com>
Date:	Fri, 7 Aug 2015 11:01:13 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	Sudip Mukherjee <sudipm.mukherjee@...il.com>
Cc:	kernel test robot <ying.huang@...el.com>,
	David Kershner <david.kershner@...sys.com>, lkp@...org,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [lkp] [staging] 68905a14e49: kernel BUG at
 drivers/base/driver.c:153!

On Fri, Aug 07, 2015 at 12:45:53PM +0530, Sudip Mukherjee wrote:
> On Thu, Aug 06, 2015 at 07:28:12PM -0700, Greg Kroah-Hartman wrote:
> > 
> > 
> > On Sat, Aug 01, 2015 at 01:12:05PM +0800, kernel test robot wrote:
> <snip>
> > > [   12.276231] RIP 
> > > [   12.276231] RIP  [<ffffffff81b68e78>] driver_register+0xa8/0xe0
> > >  [<ffffffff81b68e78>] driver_register+0xa8/0xe0
> > > [   12.276231]  RSP <ffff8800001a3e30>
> > > [   12.276231]  RSP <ffff8800001a3e30>
> > > [   12.403330] ---[ end trace 075c805d53b02836 ]---
> > > [   12.403330] ---[ end trace 075c805d53b02836 ]---
> > 
> > David, any ideas of what needs to be done to fix this?
> 
> Hi Greg,
> I was having a quick look and it looks like visorchipset is not yet
> initialised and the bus is not yet registered. If you remember we had a
> loooong discussion in another thread "usb: ulpi: don't register drivers
> if bus doesn't exist", I sent a proposed patch also. For your reference:
> "http://www.spinics.net/lists/linux-usb/msg125368.html".
> I think this one is the perfect example of that case here.

Great, then it needs to be fixed in the unisys driver code, like I said
should be done for busses to prevent this type of issue :)

thanks,

greg k-h
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