On Mon, Jan 21, 2013 at 02:02:46PM +0100, Julia Lawall wrote: > From: Julia Lawall <Julia.Lawall@xxxxxxx> > > Delete successive tests to the same location. In this case res has already > been tested for being NULL, and calling devm_request_and_ioremap will not > make it NULL. On the other hand, devm_request_and_ioremap can return NULL > on failure. > > A simplified version of the semantic match that finds this problem is as > follows: (http://coccinelle.lip6.fr/) > > // <smpl> > @s exists@ > local idexpression y; > expression x,e; > @@ > > *if ( \(x == NULL\|IS_ERR(x)\|y != 0\) ) > { ... when forall > return ...; } > ... when != \(y = e\|y += e\|y -= e\|y |= e\|y &= e\|y++\|y--\|&y\) > when != \(XT_GETPAGE(...,y)\|WMI_CMD_BUF(...)\) > *if ( \(x == NULL\|IS_ERR(x)\|y != 0\) ) > { ... when forall > return ...; } > // </smpl> > > Signed-off-by: Julia Lawall <Julia.Lawall@xxxxxxx> > > --- > This code could be improved in other ways. The previous NULL test on res > is not needed, and the dev_err in the error-handling code for the call to > devm_request_and_ioremap is redundant with respect to the logging already > done by devm_request_and_ioremap. But these should probably be done > separately. > > drivers/usb/chipidea/core.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/usb/chipidea/core.c b/drivers/usb/chipidea/core.c > index aebf695..57cae1f 100644 > --- a/drivers/usb/chipidea/core.c > +++ b/drivers/usb/chipidea/core.c > @@ -411,7 +411,7 @@ static int ci_hdrc_probe(struct platform_device *pdev) > } > > base = devm_request_and_ioremap(dev, res); > - if (!res) { > + if (!base) { > dev_err(dev, "can't request and ioremap resource\n"); > return -ENOMEM; > } > Tested-and-reviewed-by: Peter Chen <peter.chen@xxxxxxxxxxxxx> -- Best Regards, Peter Chen -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
