Re: [PATCH 1/2] mfd: 88pm800: Fix the bug that pdata may be NULL

[Chao Xie]

On Fri, Aug 30, 2013 at 8:30 PM, Samuel Ortiz <sameo@xxxxxxxxxxxxxxx> wrote:
> Hi Xie,
>
> On Tue, Aug 27, 2013 at 02:11:58PM +0800, Chao Xie wrote:
>> On Tue, Aug 20, 2013 at 9:40 AM, Samuel Ortiz <sameo@xxxxxxxxxxxxxxx> wrote:
>> > Hi Xie,
>> >
>> > On Sun, Aug 18, 2013 at 09:27:54PM -0400, Chao Xie wrote:
>> >> User pass platform data to device, and platform data may be
>> >> NULL.
>> > In which case do you get that ? With DT ?
>> > Should rtc_init fail when pdata is NULL ?
>> >
>> > You need to explain that, be it only for us to know if it's a critical
>> > fix or not.
>> >
>> Sorry for late response.
>> If pdata is NULL, the driver will fail.
> The question is: Why would pdata be NULL ? If there's a fundamental
> issue you're hiding with this patch, you probably want to fix the real
> problem instead.
>
Maybe i do not explain it clearly.
The error is detected y some software checking tool.
Pdata is passed from dev->platform_data.
If the user pass the dev->platform_data to be NULL, at least mfd device driver
need detect it, and reject it if it is not accpetable like return -EINVAL.
Then the following probing code will not cause kernel panic if we
access pdata->xxx.

> Cheers,
> Samuel.
>
> --
> Intel Open Source Technology Centre
> http://oss.intel.com/
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