linux-kernel - Re: [RFC PATCH 1/5] usb: core: hcd: Modularize HCD stop configuration in usb_stop

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Message-ID: <YSTu5KCQV242XuXV@kroah.com>
Date:   Tue, 24 Aug 2021 15:06:44 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Kishon Vijay Abraham I <kishon@...com>
Cc:     Mathias Nyman <mathias.nyman@...el.com>,
        Alan Stern <stern@...land.harvard.edu>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        chris.chiu@...onical.com
Subject: Re: [RFC PATCH 1/5] usb: core: hcd: Modularize HCD stop
 configuration in usb_stop_hcd()

On Tue, Aug 24, 2021 at 04:22:58PM +0530, Kishon Vijay Abraham I wrote:
> No functional change. Since configuration to stop HCD is invoked from
> multiple places, group all of them in usb_stop_hcd().
> 
> Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
> ---
>  drivers/usb/core/hcd.c | 42 +++++++++++++++++++++++++-----------------
>  1 file changed, 25 insertions(+), 17 deletions(-)
> 
> diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c
> index 0f8b7c93310e..c036ba5311b3 100644
> --- a/drivers/usb/core/hcd.c
> +++ b/drivers/usb/core/hcd.c
> @@ -2760,6 +2760,29 @@ static void usb_put_invalidate_rhdev(struct usb_hcd *hcd)
>  	usb_put_dev(rhdev);
>  }
>  
> +/**
> + * usb_stop_hcd - Halt the HCD
> + * @hcd: the usb_hcd that has to be halted
> + *
> + * Stop the timer and invoke ->stop() callback on the HCD
> + */
> +static void usb_stop_hcd(struct usb_hcd *hcd)
> +{
> +	if (!hcd)
> +		return;

That's impossible to hit, so no need to check for it, right?

thanks,

greg k-h