Re: [PATCH v1] soc: qcom: pbs: Simplify with dev_err_probe()

[Konrad Dybcio]

On 4.09.2024 8:55 PM, Dan Carpenter wrote:
> On Fri, Aug 30, 2024 at 05:31:14PM +0200, Konrad Dybcio wrote:
>>>
>>> There are a few things which we could do:
>>>
>>> 1) Returning -EPROBE_DEFER to an ioctl or something besides a probe()
>>>    This is a bug right?  -EPROBE_DEFER is basically kernel internal for probe()
>>>    functions.  It tried to write this but it was complicated so I gave up.
>>
>> Maybe call_tree.pl can somehow be used with an if name[-5:] == "probe"
>> or something along those lines..
>>
> 
> I wrote the call_tree.pl script before I had the database.  These days I tend to
> use the database instead.
> 
> I've implemented this check but it only looks at ioctls.  I'll test it tonight.
> 
>>>
>>> 2) Printing an error message for -EPROBE_DEFER warnings
>>>    I've written this check and I can test it tonight.
>>>
> 
> I've done this.  See the attached check and the dont_print.list file attached.
> The line numbers are based on linux next.  The false positives from here are
> pretty harmless because calling dev_err_probe() is fine.
> 
>>> 3) Not propagating the -EPROBE_DEFER returns
>>>    This shouldn't be too hard to write.
>>>
> 
> I've done this too.  The false positives from this could be bad, because we only
> want to propagate -EPROBE_DEFER back from probe() functions.
> 
> See propagate.list.

This is great work, thank you Dan!

Konrad