linux-kernel - Re: [RESEND PATCH v2 5/7] usb: xhci: plat: Remove checks for optional clock in error/remove path

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Message-ID: <87h9enpqdb.fsf@intel.com>
Date:	Wed, 27 Apr 2016 08:33:52 +0300
From:	Felipe Balbi <felipe.balbi@...ux.intel.com>
To:	Jisheng Zhang <jszhang@...vell.com>, mathias.nyman@...ux.intel.com,
	gregkh@...uxfoundation.org
Cc:	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	yendapally.reddy@...adcom.com, Jisheng Zhang <jszhang@...vell.com>
Subject: Re: [RESEND PATCH v2 5/7] usb: xhci: plat: Remove checks for optional clock in error/remove path

Jisheng Zhang <jszhang@...vell.com> writes:
> Commit 63589e92c2d9 ("clk: Ignore error and NULL pointers passed to
> clk_{unprepare, disable}()") allows NULL or error pointer to be passed
> unconditionally.
>
> This patch is to simplify probe error and remove code paths.

this seems wrong to me. xhci->clk isn't initialized to NULL, it's either
initialized to a valid struct clk * or some ERR_PTR() value.

Care to explain ?

> Signed-off-by: Jisheng Zhang <jszhang@...vell.com>
> ---
>  drivers/usb/host/xhci-plat.c | 6 ++----
>  1 file changed, 2 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c
> index 0e69712..83669d0 100644
> --- a/drivers/usb/host/xhci-plat.c
> +++ b/drivers/usb/host/xhci-plat.c
> @@ -266,8 +266,7 @@ put_usb3_hcd:
>  	usb_put_hcd(xhci->shared_hcd);
>  
>  disable_clk:
> -	if (!IS_ERR(clk))
> -		clk_disable_unprepare(clk);
> +	clk_disable_unprepare(clk);
>  
>  put_hcd:
>  	usb_put_hcd(hcd);
> @@ -287,8 +286,7 @@ static int xhci_plat_remove(struct platform_device *dev)
>  	usb_remove_hcd(hcd);
>  	usb_put_hcd(xhci->shared_hcd);
>  
> -	if (!IS_ERR(clk))
> -		clk_disable_unprepare(clk);
> +	clk_disable_unprepare(clk);
>  	usb_put_hcd(hcd);
>  
>  	return 0;
> -- 
> 2.8.1
>
> --
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-- 
balbi

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