linux-kernel - Re: [PATCH] usb: gadget: aspeed: Remove redundant null check before clk_disable

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Message-Id: <661ad7bc-b299-4ada-be93-4e2925d79143@www.fastmail.com>
Date:   Mon, 07 Dec 2020 10:42:52 +1030
From:   "Andrew Jeffery" <andrew@...id.au>
To:     "Xu Wang" <vulab@...as.ac.cn>, "Felipe Balbi" <balbi@...nel.org>,
        "Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
        "Joel Stanley" <joel@....id.au>, "Tao Ren" <rentao.bupt@...il.com>,
        "Benjamin Herrenschmidt" <benh@...nel.crashing.org>,
        linux-arm-kernel@...ts.infradead.org, linux-aspeed@...ts.ozlabs.org
Cc:     linux-kernel@...r.kernel.org
Subject: Re: [PATCH] usb: gadget: aspeed: Remove redundant null check before clk_disable_unprepare



On Fri, 4 Dec 2020, at 19:21, Xu Wang wrote:
> Because clk_disable_unprepare() already checked NULL clock parameter,
> so the additional check is unnecessary, just remove it.
> 
> Signed-off-by: Xu Wang <vulab@...as.ac.cn>

Pity we have to dig through the implementation of clk_disable_unprepare() to 
figure this out, but oh well.

Reviewed-by: Andrew Jeffery <andrew@...id.au>

> ---
>  drivers/usb/gadget/udc/aspeed-vhub/core.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/drivers/usb/gadget/udc/aspeed-vhub/core.c 
> b/drivers/usb/gadget/udc/aspeed-vhub/core.c
> index be7bb64e3594..ea47f4b98de9 100644
> --- a/drivers/usb/gadget/udc/aspeed-vhub/core.c
> +++ b/drivers/usb/gadget/udc/aspeed-vhub/core.c
> @@ -282,8 +282,7 @@ static int ast_vhub_remove(struct platform_device 
> *pdev)
>  	       VHUB_CTRL_PHY_RESET_DIS,
>  	       vhub->regs + AST_VHUB_CTRL);
>  
> -	if (vhub->clk)
> -		clk_disable_unprepare(vhub->clk);
> +	clk_disable_unprepare(vhub->clk);
>  
>  	spin_unlock_irqrestore(&vhub->lock, flags);
>  
> -- 
> 2.17.1
> 
>