linux-kernel - Re: [PATCH] Input: mc13783-pwrbutton: Allocate resources using managed interfaces

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Message-ID: <20140526053251.GC12890@core.coreip.homeip.net>
Date:	Sun, 25 May 2014 22:32:51 -0700
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Himangi Saraogi <himangi774@...il.com>
Cc:	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
	julia.lawall@...6.fr
Subject: Re: [PATCH] Input: mc13783-pwrbutton: Allocate resources using
 managed interfaces

On Sun, May 25, 2014 at 03:44:01PM +0530, Himangi Saraogi wrote:
> This patch moves most data allocated in the probe function from
> unmanaged interfaces to managed interfaces. The kfrees and error
> handling code is done away with. The unnecesary labels are
> removed. Also, linux/device.h is added to make sure the devm_*()
> routine declarations are unambiguously available. The name of label
> free_priv is changed to unlock as it does not free priv anymore.
> 
> The following Coccinelle semantic patch was used for making a part of
> the change:
> 
> @platform@
> identifier p, probefn, removefn;
> @@
> struct platform_driver p = {
>   .probe = probefn,
>   .remove = removefn,
> };
> 
> @prb@
> identifier platform.probefn, pdev;
> expression e, e1, e2;
> @@
> probefn(struct platform_device *pdev, ...) {
>   <+...
> - e = kzalloc(e1, e2)
> + e = devm_kzalloc(&pdev->dev, e1, e2)
>   ...
> ?-kfree(e);
>   ...+>
> }
> 
> @rem depends on prb@
> identifier platform.removefn;
> expression e;
> @@
> removefn(...) {
>   <...
> - kfree(e);
>   ...>
> }
> 
> Signed-off-by: Himangi Saraogi <himangi774@...il.com>
> Acked-by: Julia Lawall <julia.lawall@...6.fr>
> ---
> Not compiled due to incompatible architecture.
> 
> mc13xxx_irq_request is not devm'd, and doing so looks complicated due to
> the locks around the frees.  Is there some way to resolve this issue?

Yes there us - let's leave the driver as is so we are not mixing the 2
styles.

Thanks.

-- 
Dmitry
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