On Tue, Nov 20, 2012 at 12:41:03PM +0100, Marc Kleine-Budde wrote:
> On 11/20/2012 02:33 AM, Peter Chen wrote:
> > On Mon, Nov 19, 2012 at 05:05:16PM +0100, Marc Kleine-Budde wrote:
> >>> +int ci_hdrc_otg_init(struct ci13xxx *ci)
> >>> +{
> >>> + /* Useless at current */
> >>> + ci->otg.set_peripheral = ci_otg_set_peripheral;
> >>> + ci->otg.set_host = ci_otg_set_host;
> >>> + if (!IS_ERR_OR_NULL(ci->transceiver))
> >> ^^^^^^^^^^^^^^
> >>
> >> Is considered harmful by some people. Can we test against NULL here?
> >
> > Any stories that it is harmful?
>
> Your use-case isn't but there others are:
> http://www.mail-archive.com/linux-omap@vger.kernel.org/msg78030.html
Thanks, marc. It said below code is error if the foo is really null.
if (IS_ERR_OR_NULL(foo))
return PTR_ERR(foo);
For this case, the ci->transceiver may be null or errno pointer, it
needs IS_ERR_OR_NULL.
>
> Marc
>
> --
> Pengutronix e.K. | Marc Kleine-Budde |
> Industrial Linux Solutions | Phone: +49-231-2826-924 |
> Vertretung West/Dortmund | Fax: +49-5121-206917-5555 |
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>
--
Best Regards,
Peter Chen
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