linux-kernel - Re: [PATCH] usb: move assignment out of if condition

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Message-ID: <55929B0F.6060309@cogentembedded.com>
Date:	Tue, 30 Jun 2015 16:35:11 +0300
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	Kris Borer <kborer@...il.com>, gregkh@...uxfoundation.org
Cc:	stern@...land.harvard.edu, balbi@...com, pmladek@...e.cz,
	antoine.tenart@...e-electrons.com, hdegoede@...hat.com,
	rafael.j.wysocki@...el.com, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] usb: move assignment out of if condition

Hello.

On 6/30/2015 4:02 PM, Kris Borer wrote:

> Fix four occurrences of the checkpatch.pl error:

> ERROR: do not use assignment in if condition

> Signed-off-by: Kris Borer <kborer@...il.com>
> ---
>   drivers/usb/core/hcd.c | 13 ++++++++-----
>   1 file changed, 8 insertions(+), 5 deletions(-)

> diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c
> index be5b207..e268c45 100644
> --- a/drivers/usb/core/hcd.c
> +++ b/drivers/usb/core/hcd.c
[...]
> @@ -2734,7 +2735,8 @@ 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);
> +	if (hcd->driver->reset && retval < 0) {

    If hcd->driver->reset() is NULL, this change warrants a kernel oops.

[...]

WBR, Sergei

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