linux-kernel - Re: [PATCH] regmap: Fix 'ret' would return an uninitialized value

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Message-ID: <CAGG-pUQWnFN1pGFGw9BaE7kDt9ODfpCfmuNB1vV0Jn=mTXTVXA@mail.gmail.com>
Date:	Fri, 15 Nov 2013 13:52:19 -0200
From:	Geyslan Gregório Bem <geyslan@...il.com>
To:	levex@...ux.com
Cc:	Caizhiyong <caizhiyong@...ilicon.com>,
	Mark Brown <broonie@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Wanglin (Albert)" <albert.wanglin@...ilicon.com>,
	Levente Kurusa <ilevex.linux@...il.com>
Subject: Re: [PATCH] regmap: Fix 'ret' would return an uninitialized value

2013/11/15 Levente Kurusa <levex@...ux.com>:
> 2013-11-15 14:00 keltezéssel, Geyslan Gregório Bem írta:
>> 2013/11/15 Caizhiyong <caizhiyong@...ilicon.com>:
>>> From: Cai Zhiyong <caizhiyong@...wei.com>
>>> Date: Mon, 11 Nov 2013 19:26:14 +0800
>>> Subject: [PATCH] regmap: Fix 'ret' would return an uninitialized value
>>>
>>> This patch give a warning when calling regmap_register_patch with
>>> parameter num_regs <= 0.
>>>
>>> When the num_regs parameter is zero and krealloc doesn't fail,
>>> then the code would return an uninitialized value. However,
>>> calling this function with num_regs == 0, would be a waste as it
>>> essentially does nothing.
>>>
>>> Signed-off-by: Cai Zhiyong <caizhiyong@...wei.com>
>> Reviewed-by: Geyslan G. Bem <geyslan@...il.com>
>>
>> Seems a good approach.
>>
>
> The patch doesn't apply. After manually applying this it
> threw a compilation error:
>
> drivers/base/regmap/regmap.c: In function ‘regmap_register_patch’:
> drivers/base/regmap/regmap.c:2176:6: error: expected expression before ‘)’ token
>
>
> Cai,
> You have missed the second parameter of WARN_ONCE().
> Please append what you'd prefer to have outputten once the condition evaluates to true.
>
> --
> Regards,
> Levente Kurusa
Cai, Levente,

Maybe this:

+       if (WARN_ONCE(num_regs <= 0, "number of registers [%d] must be
major than 0", num_regs))
+               return 0;
+

-- 
Regards,

Geyslan G. Bem
hackingbits.com
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