linux-kernel - Re: [PATCH 1/4] drivers/staging/usbip/userspace/libsrc/vhci_driver.c: test the just-initialized value

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Date:	Tue, 23 Aug 2011 12:59:00 +0800
From:	David Chang <dchang@...e.com>
To:	Julia Lawall <julia@...u.dk>
Cc:	Matt Mooney <mfm@...eddisk.com>, kernel-janitors@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...e.de>, linux-usb@...r.kernel.org,
	devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/4] drivers/staging/usbip/userspace/libsrc/vhci_driver.c:
 test the just-initialized value

2011/8/22 Julia Lawall <julia@...u.dk>:
> From: Julia Lawall <julia@...u.dk>
>
> Test the just-initialized value rather than some other one.
>
> The semantic match that finds this problem is as follows:
> (http://coccinelle.lip6.fr/)
>
> // <smpl>
> @r@
> identifier x,y,f!={PTR_ERR,ERR_PTR,ERR_CAST};
> statement S;
> @@
>
> x = f(...);
> (
> if (\(x == NULL\|IS_ERR(x)\)) S
> |
> *if (\(y == NULL\|IS_ERR(y)\))
>  { ... when != x
>   return ...; }
> )
> // </smpl>
>
> Signed-off-by: Julia Lawall <julia@...u.dk>
>
> ---
>  drivers/staging/usbip/userspace/libsrc/vhci_driver.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/staging/usbip/userspace/libsrc/vhci_driver.c b/drivers/staging/usbip/userspace/libsrc/vhci_driver.c
> index abbc285..2697877 100644
> --- a/drivers/staging/usbip/userspace/libsrc/vhci_driver.c
> +++ b/drivers/staging/usbip/userspace/libsrc/vhci_driver.c
> @@ -133,7 +133,7 @@ static int check_usbip_device(struct sysfs_class_device *cdev)
>                             strlen(vhci_driver->hc_device->path))) {
>                        /* found usbip device */
>                        usbip_cdev = calloc(1, sizeof(*usbip_cdev));
> -                       if (!cdev) {
> +                       if (!usbip_cdev) {
>                                dbg("calloc failed");
>                                return -1;
>                        }
>

Acked-by: David Chang <dchang@...e.com>

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