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SubjectRe: w1: 3.14-rc7 - possible recursive locking detected
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Hi,

Am 23.03.2014 um 22:50 schrieb David Fries:

> On Mon, Mar 17, 2014 at 10:38:13PM +0100, Belisko Marek wrote:
>> Hi,
>>
>> booting latest 3.14-rc7 on gta04 board gives following warning:
>>
>> [ 3.101409] Driver for 1-wire Dallas network protocol.
>> [ 3.109649] omap_hdq omap_hdq: OMAP HDQ Hardware Rev 0.5. Driver in
>> [ 3.400146] CPU0
>> [ 3.402709] ----
>> [ 3.405273] lock(&(&priv->bus_notifier)->rwsem);
>> [ 3.410308] lock(&(&priv->bus_notifier)->rwsem);
>> [ 3.415374]
>> [ 3.415374] *** DEADLOCK ***
>>
>> AFAIK we didn't see that on (at least 3/14-rc2).
>
> The last drivers/w1 change went in before v3.14-rc1, so if it is
> something in the w1 code, it has either been there or something else
> in the rest of the kernel changed to expose it. I'm using the ds2490
> USB w1 dongle, I didn't see that problem when enabling lock debugging
> on 3.14.0-rc5+ which includes some changes I'm working on.
>
> https://github.com/dfries/linux.git w1_rework

Further analysis shows that It only occurs when using the device tree.

So it may have to do something with nested driver probing/locking running
differently between DT and board file.

BR,
Nikolaus



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