linux-kernel - Re: Qemu crashes in -next due to 'of: remove *phandle properties from expanded device tree'

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Date:   Thu, 15 Jun 2017 02:53:55 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Frank Rowand <frowand.list@...il.com>
Cc:     Frank Rowand <frank.rowand@...y.com>, linux-kernel@...r.kernel.org,
        Rob Herring <robh@...nel.org>
Subject: Re: Qemu crashes in -next due to 'of: remove *phandle properties from
 expanded device tree'

On 06/15/2017 12:58 AM, Frank Rowand wrote:
> On 06/14/17 21:12, Guenter Roeck wrote:
> 
> < snip >
> 
>> Good (v4.12-rc4):
>>
> 
> < snip >
> 
>> OF: Checking node /soc@...00000/pic@...00
>> OF:     type match
>> OF:   node '/soc@...00000/pic@...00' compatible '' type 'open-pic' name '' score 2
>> OF:   node '/soc@...00000/pic@...00' compatible 'open-pic' type '' name '' score 0
> 
> < snip >
> 
>>
>> bad:
> 
> < snip >
> 
>> OF: Checking node /soc@...00000/pic@...00
>> OF:   node '/soc@...00000/pic@...00' compatible '' type 'open-pic' name '' score 0
>> OF:   node '/soc@...00000/pic@...00' compatible 'open-pic' type '' name '' score 0
> 
> < snip >
> 
>> No matching open-pic node
>> ------------[ cut here ]------------
>> kernel BUG at arch/powerpc/platforms/85xx/corenet_generic.c:50!
>>
>> So, in __of_device_is_compatible(), the difference is in
>> __of_device_is_compatible() after
>>
>>          /* Matching type is better than matching name */
>>
>> Further debugging shows that device->type is NULL in the bad case.
>>
>> OF: Checking node /soc@...00000/pic@...00
>> OF:     trying type match open-pic - <NULL>
>> OF:   node '/soc@...00000/pic@...00' compatible '' type 'open-pic' name '' score 0
>> OF:   node '/soc@...00000/pic@...00' compatible 'open-pic' type '' name '' score 0
>>
>> Do you need more information ?
> 
> I think I know what part of my patch is causing the problem.
> 
> Can you try the following patch to see if if fixes the failure in
> __of_device_is_compatible()?
> 
> If this fixes the failure, then I know what is going on.  If it works
> then I will have to rework my original patch in a different way than
> this quick hack.
> 

Sorry, doesn't make a difference.

OF: Checking node /soc@...00000/pic@...00
OF:     trying type match open-pic - <NULL>
OF:   node '/soc@...00000/pic@...00' compatible '' type 'open-pic' name '' score 0
OF:   node '/soc@...00000/pic@...00' compatible 'open-pic' type '' name '' score 0

I added a log message into __of_attach_node(); it is not called.

Guenter