linux-kernel - Re: [PATCH v1 1/1] drivers: base: Fix NULL pointer exception in __platform_driver

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Date:   Tue, 28 Apr 2020 12:24:05 -0700
From:   "Kuppuswamy, Sathyanarayanan" 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     rafael@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 1/1] drivers: base: Fix NULL pointer exception in
 __platform_driver_probe()

Hi Greg,

On 4/28/20 12:03 PM, Greg KH wrote:
> On Wed, Apr 08, 2020 at 02:40:03PM -0700, sathyanarayanan.kuppuswamy@...ux.intel.com wrote:
>> From: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@...ux.intel.com>
>>
>> If platform bus driver registration is failed then,
> 
> How is your platform driver registration failing?  What caused that, is
> it an in-kernel problem with something?  How can it be triggered?
In my case I triggered it intentionally. For one of our internal
project we want to strictly control the number of drivers/devices
allowed in kernel. To verify the feasibility of adding above support,
I intentionally failed few bus drivers and checked the behavior. In
one of those tests I hence came across the mentioned issue.

In any case, platform bus driver registration failure is a valid case
right ? Any issue we notice when this happens needs to be handled right?
> 
> thanks,
> 
> greg k-h
>