linux-kernel - Re: [PATCH 5/5] ohci-tmio.c : missing 'break' statements

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Date:	Wed, 25 Feb 2015 17:13:04 -0500 (EST)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Ameen Ali <ameenali023@...il.com>
cc:	gregkh@...uxfoundation.org, <linux-usb@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 5/5] ohci-tmio.c : missing 'break' statements

The "break" statements are missing by intention.

On Wed, 25 Feb 2015, Ameen Ali wrote:

> Redundant bitwise operation on 'pm' in 'switch' statement.

Why do you say the operations are redundant?

> Signed-off-by : Ameen Ali <Ameenali023@...il.com>
> ---
>  drivers/usb/host/ohci-tmio.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/usb/host/ohci-tmio.c b/drivers/usb/host/ohci-tmio.c
> index e9a6eec..c580615 100644
> --- a/drivers/usb/host/ohci-tmio.c
> +++ b/drivers/usb/host/ohci-tmio.c
> @@ -102,10 +102,13 @@ static void tmio_stop_hc(struct platform_device *dev)
>  			dev_err(&dev->dev, "Unsupported amount of ports: %d\n", ohci->num_ports);
>  		case 3:
>  			pm |= CCR_PM_USBPW3;
> +			break;
>  		case 2:
>  			pm |= CCR_PM_USBPW2;
> +			break;
>  		case 1:
>  			pm |= CCR_PM_USBPW1;
> +			break;
>  	}
>  	tmio_iowrite8(0, tmio->ccr + CCR_INTC);
>  	tmio_iowrite8(0, tmio->ccr + CCR_ILME);

This patch is wrong.  Figuring out why is left as an exercise.

Alan Stern

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