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

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Date:	Mon, 28 Jul 2014 09:49:35 -0700
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	pramod.gurav.etc@...il.com
Cc:	linux-input@...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

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).
> 
> 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)?

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.

Thanks.

-- 
Dmitry
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