linux-kernel - Re: [PATCH v3 1/9] misc: sram: fix enabled clock leak on error path

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Date:	Tue, 19 May 2015 12:41:29 +0200
From:	Philipp Zabel <p.zabel@...gutronix.de>
To:	Vladimir Zapolskiy <vladimir_zapolskiy@...tor.com>
Cc:	Heiko Stübner <heiko@...ech.de>,
	Arnd Bergmann <arnd@...db.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 1/9] misc: sram: fix enabled clock leak on error path

Am Montag, den 18.05.2015, 22:08 +0300 schrieb Vladimir Zapolskiy:
> If devm_gen_pool_create() fails, the previously enabled sram->clk is
> not disabled on probe() exit.
> 
> Signed-off-by: Vladimir Zapolskiy <vladimir_zapolskiy@...tor.com>
> ---
>  drivers/misc/sram.c | 9 +++++----
>  1 file changed, 5 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/misc/sram.c b/drivers/misc/sram.c
> index eeaaf5f..b44a423 100644
> --- a/drivers/misc/sram.c
> +++ b/drivers/misc/sram.c
> @@ -90,16 +90,17 @@ static int sram_probe(struct platform_device *pdev)
>  	if (!sram)
>  		return -ENOMEM;
>  
> +	sram->pool = devm_gen_pool_create(&pdev->dev,
> +					  ilog2(SRAM_GRANULARITY), -1);
> +	if (!sram->pool)
> +		return -ENOMEM;
> +
>  	sram->clk = devm_clk_get(&pdev->dev, NULL);
>  	if (IS_ERR(sram->clk))
>  		sram->clk = NULL;
>  	else
>  		clk_prepare_enable(sram->clk);

Here you move sram->clk around, and later in patch 7 it gets moved
again. To me it looks like the two should be squashed together.

>  
> -	sram->pool = devm_gen_pool_create(&pdev->dev, ilog2(SRAM_GRANULARITY), -1);
> -	if (!sram->pool)
> -		return -ENOMEM;
> -
>  	/*
>  	 * We need an additional block to mark the end of the memory region
>  	 * after the reserved blocks from the dt are processed.

regards
Philipp

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