linux-kernel - Re: [PATCH -next] smsc911x: Fix crash seen if neither ACPI nor OF is configured or used

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Message-ID: <55DE27BD.600@roeck-us.net>
Date:	Wed, 26 Aug 2015 13:55:25 -0700
From:	Guenter Roeck <linux@...ck-us.net>
To:	Tony Lindgren <tony@...mide.com>
CC:	Steve Glendinning <steve.glendinning@...well.net>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	Jeremy Linton <jeremy.linton@....com>,
	linux-omap@...r.kernel.org
Subject: Re: [PATCH -next] smsc911x: Fix crash seen if neither ACPI nor OF
 is configured or used

Hi Tony,

On 08/26/2015 01:16 PM, Tony Lindgren wrote:
[ ... ]

>> We may need two separate patches, one to fix up device_property_read_u32()
>> to return -ENXIO, and one to fix smsc911x_probe_config() to ignore the error
>> from device_get_phy_mode(), and to bail out if device_property_read_u32()
>> returns -ENXIO.
>
> I guess the device_property_read_u32() change needs to be discussed
> separately.. So probably best to fix up the regression to smsc911x
> first.
>
Not sure myself. Jeremy has a point - we don't really know for sure how
safe it is to check for -ENODATA (in addition to -ENXIO). Also, fixing
device_property_read_u32() turned out to be much easier than I thought.

>> The simpler alternative would be to check the return value from
>> device_property_read_u32() for both -ENXIO and -ENODATA.
>> This would make the code independent of the necessary core changes
>> (which may take a while). I tested this variant, and it works, at least
>> for the non-DT case.
>>
>> Does this make sense ?
>
> Yeh I think that would allow fixing up the smsc911x regression while
> discussing the device_property_read_u32() change. Got a test patch
> for me to try?
>

You should have two by now to choose from.

Guenter

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