linux-kernel - Re: [PATCH] USB: misplaced parenthesis

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Date:	Mon, 15 Feb 2010 14:44:08 -0800
From:	Joe Perches <joe@...ches.com>
To:	Roel Kluin <roel.kluin@...il.com>
Cc:	Matthew Dharm <mdharm-usb@...-eyed-alien.net>,
	linux-usb@...r.kernel.org, usb-storage@...ts.one-eyed-alien.net,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] USB: misplaced parenthesis

On Mon, 2010-02-15 at 23:40 +0100, Roel Kluin wrote:
> The parenthesis was misplaced
> 
> Signed-off-by: Roel Kluin <roel.kluin@...il.com>
> ---
> Is this maybe, as the comment states, why blanking a cdrw at speed 4
> was unreliable?
> 
> diff --git a/drivers/usb/storage/shuttle_usbat.c b/drivers/usb/storage/shuttle_usbat.c
> index b62a288..b958db5 100644
> --- a/drivers/usb/storage/shuttle_usbat.c
> +++ b/drivers/usb/storage/shuttle_usbat.c
> @@ -1645,8 +1645,8 @@ static int usbat_hp8200e_transport(struct scsi_cmnd *srb, struct us_data *us)
>  
>  	if ((result = usbat_write_block(us,
>  			USBAT_ATA, srb->cmnd, 12,
> -				(srb->cmnd[0]==GPCMD_BLANK ? 75 : 10), 0) !=
> -			     USB_STOR_TRANSPORT_GOOD)) {
> +				(srb->cmnd[0]==GPCMD_BLANK ? 75 : 10), 0)) !=
> +			     USB_STOR_TRANSPORT_GOOD) {
>  		return result;
>  	}

I think it'd be better if you hoisted the set'n'test out of the if()

Isn't this the current logic?

	result = usbat_write_block(us, USBAT_ATA, srb->cmnd, 12,
				   srb->cmnd[0] == GPCMD_BLANK ? 75 : 10, 0);
	result = result != USB_STOR_TRANSPORT_GOOD;
	if (result)
		return result;

I wonder if it should be:

	result = usbat_write_block(us, USBAT_ATA, srb->cmnd, 12,
				   srb->cmnd[0] == GPCMD_BLANK ? 75 : 10, 0);
	if (result != USB_STOR_TRANSPORT_GOOD)
		return result;


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