linux-kernel - Re: [PATCH 3/6] drivers: usb: core: hcd.c: remove assignment of variables in if conditions.

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Message-ID: <54D74548.4020602@cogentembedded.com>
Date:	Sun, 08 Feb 2015 14:15:20 +0300
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	Bas Peters <baspeters93@...il.com>, gregkh@...uxgoundation.org,
	stern@...land.harvard.edu
CC:	dan.j.williams@...el.com, hdegoede@...hat.com,
	sarah.a.sharp@...ux.intel.com, peter.chen@...escale.com,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/6] drivers: usb: core: hcd.c: remove assignment of variables
 in if conditions.

Hello.

On 2/8/2015 12:55 AM, Bas Peters wrote:

> This patch removes assignment of variables in if conditions,
> as specified in CodingStyle.

> Signed-off-by: Bas Peters <baspeters93@...il.com>
> ---
>   drivers/usb/core/hcd.c | 15 ++++++++++-----
>   1 file changed, 10 insertions(+), 5 deletions(-)

> diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c
> index 11cee55..37c40d1 100644
> --- a/drivers/usb/core/hcd.c
> +++ b/drivers/usb/core/hcd.c
[...]
> @@ -2733,7 +2736,8 @@ int usb_add_hcd(struct usb_hcd *hcd,
>   	/* "reset" is misnamed; its role is now one-time init. the controller
>   	 * should already have been reset (and boot firmware kicked off etc).
>   	 */
> -	if (hcd->driver->reset && (retval = hcd->driver->reset(hcd)) < 0) {
> +	retval = hcd->driver->reset(hcd);

    This will crash if 'hcd->driver->reset' is NULL (which is only checked below).

> +	if (hcd->driver->reset && retval < 0) {

    It wasn't equivalent change anyway as the right part of && is only 
executed if the left part is true.

WBR, Sergei

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