linux-kernel - Re: SBus devices sometimes detected, sometimes not

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Date:	Wed, 18 May 2011 16:59:45 +0300 (EEST)
From:	mroos@...ux.ee
To:	Grant Likely <grant.likely@...retlab.ca>
cc:	David Miller <davem@...emloft.net>, sparclinux@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: SBus devices sometimes detected, sometimes not

> It would be good to know the exact failure mode, so we need to know if
> of_driver_match_device() is setting of_match which is subsequently
> getting cleared, or if of_driver_match_device() isn't getting called
> at all.  Meelis, can you add something like the following code to
> include/linux/of_device.h in the of_driver_match_device() function
> between the of_match_device() call and the return statement:
> 
> if (dev->of_match)
>         printk("found match; node=%s, driver=%s\n",
>                  dev->of_node->full_name, drv->name);
> 

Tried it with todays 2.6.39-rc7-00211-gc1d10d1. It was harder to 
reproduce this time, about 1 time out of 10.

In normal operation:

[   77.794877] found match; node=/sbus@1f,0/SUNW,hme@0,8c00000, driver=hme
[   77.872379] sunhme.c:v3.10 August 26, 2008 David S. Miller (davem@...emloft.net)
[   77.962865] eth0: HAPPY MEAL (SBUS) 10/100baseT Ethernet 08:00:20:88:6d:6a

In case of error (bpp show only as an example that some things work):

[   70.312166] found match; node=/sbus@1f,0/SUNW,bpp@e,c800000, driver=bpp
[   70.389649] parport0: sunbpp at 0x1ffec800000
[   70.477720] found match; node=/sbus@1f,0/SUNW,hme@0,8c00000, driver=hme
[   70.578023] found match; node=/sbus@1f,0/QLGC,isp@1,10000, driver=qpti
[   70.915544] hme: probe of f006be34 failed with error -22
[   70.978825] qpti: probe of f00798c4 failed with error -22

-- 
Meelis Roos (mroos@...ux.ee)
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