linux-kernel - Re: [PATCH] input: ads7846: Switch to managed version of kzalloc and cleanups

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Date:	Mon, 28 Jul 2014 22:37:18 +0530
From:	Pramod Gurav <pramod.gurav.etc@...il.com>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:	linux-input@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Pramod Gurav <pramod.gurav@...rtplayin.com>,
	Guenter Roeck <linux@...ck-us.net>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	Mark Brown <broonie@...aro.org>,
	Fabio Estevam <fabio.estevam@...escale.com>
Subject: Re: [PATCH] input: ads7846: Switch to managed version of kzalloc and cleanups

Thanks Dmitry for reviewing.

On Mon, Jul 28, 2014 at 10:19 PM, Dmitry Torokhov
<dmitry.torokhov@...il.com> wrote:
> Hi Pramod,
>
> On Mon, Jul 28, 2014 at 02:16:55PM +0530, pramod.gurav.etc@...il.com wrote:
>> From: Pramod Gurav <pramod.gurav@...rtplayin.com>
>>
>> This switches memory allocations from kzalloc to devm_kzalloc.
>> This also changes the way return checks were done on failure cases
>> of three allocations. The checks were clubbed together and hence
>> must be done seperately to avoid calling kfree on unallocated memory.
>>
>> Moreover in case of input_allocate_device failure, we were calling
>> input_free_device which is not needed.
>
> But not hurting either - like kfree() and many other "cleanup" functions
> in kernel they are happily accept NULL input (so that cleanup code is
> less branchy).
>>
Great. Good to learn.
>> input device must be released(input_free_device) when ads7846_probe_dt
>> fails hence adds a fix there as well.
>
> That is the real bug, could you send me a patch that fixes just that (by
> jumping to err_free_mem)?
Sure I will.

>
> The rest I'd like to leave as is unless you can convert _all_ resources
> to be managed ones: mixing up 2 styles (manual and automatic release) is
> bound to have issues (like we had with ads7846_probe_dt which assumed
> that since it was releasing its resources automatically the rest would
> be released automatically as well.

I thought I would use a managed input_device allocation in a separate patch.
I will convert all allocations to managed then.

This driver also registers a irq. You suggest to convert it to managed as well?
I was planning to do that?
>
> Thanks.
>
> --
> Dmitry



-- 
Thanks and Regards
Pramod
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