linux-kernel - Re: [PATCH] arm: Add clk_get_rate input parameter null check

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Message-ID: <15cc973a481dea85081c4466b18df6a3e0cb280f.camel@gmail.com>
Date:   Fri, 06 Nov 2020 06:57:49 +0100
From:   Alexander Sverdlin <alexander.sverdlin@...il.com>
To:     Wang Qing <wangqing@...o.com>,
        Hartley Sweeten <hsweeten@...ionengravers.com>,
        Russell King <linux@...linux.org.uk>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm: Add clk_get_rate input parameter null check

Hello Wang!

On Fri, 2020-11-06 at 09:46 +0800, Wang Qing wrote:
> The input parameter of clk_get_rate() is checked with IS_ERR(),
> so here we need to check null on clk.

Thank you for the patch!

> Signed-off-by: Wang Qing <wangqing@...o.com>
Acked-by: Alexander Sverdlin <alexander.sverdlin@...il.com>

> ---
>  arch/arm/mach-ep93xx/clock.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/arch/arm/mach-ep93xx/clock.c b/arch/arm/mach-
> ep93xx/clock.c
> index 2810eb5..4313b2f
> --- a/arch/arm/mach-ep93xx/clock.c
> +++ b/arch/arm/mach-ep93xx/clock.c
> @@ -321,6 +321,9 @@ static unsigned long get_uart_rate(struct clk
> *clk)
>  
>  unsigned long clk_get_rate(struct clk *clk)
>  {
> +	if (!clk)
> +		return 0;
> +
>  	if (clk->get_rate)
>  		return clk->get_rate(clk);
>  
-- 
Alexander Sverdlin.