linux-kernel - Re: [PATCH 2/3] drivers:input:ps2 Added sunxi A20 ps2 driver, changed makefile and Kconfig

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Date:	Fri, 05 Dec 2014 07:53:46 -0800
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Arnd Bergmann <arnd@...db.de>
CC:	linux-arm-kernel@...ts.infradead.org,
	vishnupatekar <vishnupatekar0510@...il.com>,
	maxime.ripard@...e-electrons.com, linux-sunxi@...glegroups.com,
	devicetree@...r.kernel.org, benh@...nel.crashing.org,
	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
	ralf@...ux-mips.org, robh+dt@...nel.org, msalter@...hat.com,
	vishnupatekar <VishnuPatekar0510@...il.com>, jdelvare@...e.de
Subject: Re: [PATCH 2/3] drivers:input:ps2 Added sunxi A20 ps2 driver, changed makefile and Kconfig

On December 5, 2014 7:50:18 AM PST, Arnd Bergmann <arnd@...db.de> wrote:
>On Friday 05 December 2014 07:01:17 Dmitry Torokhov wrote:
>> 
>> On December 5, 2014 2:33:11 AM PST, Arnd Bergmann <arnd@...db.de>
>wrote:
>> >On Thursday 04 December 2014 04:23:44 vishnupatekar wrote:
>> >> +
>> >> +struct sunxips2data {
>> >> +    int irq;
>> >> +    spinlock_t ps2_lock;
>> >> +    void __iomem *base_address;     /* virt address of control
>registers*/
>> >> +    struct serio *serio;            /* serio*/
>> >> +    struct device *dev;
>> >> +    struct  clk     *pclk;
>> >> +};
>> >
>> >As this is dynamically allocated, better embed the serio member
>> >directly to avoid allocating both separately.
>> 
>> That would be wrong - serio is refcounted and it may outlive instance
>of sunxips2data you embedded it into.
>
>Ok, I see. I guess in this case the use of devm_kzalloc for serio is a
>bug,
>because that would lead to a double free upon module unload, right?
>

Exactly. I already mentioned that in my review.

Thanks.

-- 
Dmitry
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