> -----Original Message-----
> From: Arce, Abraham
> Sent: Thursday, May 06, 2010 6:18 AM
> To: Tony Lindgren
> Cc: G, Manjunath Kondaiah; linux-omap@vger.kernel.org;
> spi-devel-gene...@lists.sourceforge.net
> Subject: RE: [PATCH v1 2/3] OMAP4: Ethernet: KS8851 Board Support
>
> > > > > +
> > > > > +static void omap_ethernet_init(void)
> > > > > +{
> > > > > + gpio_request(ETHERNET_KS8851_POWER_ENABLE, "ethernet");
> > > > > + gpio_direction_output(ETHERNET_KS8851_POWER_ENABLE, 1);
> > > > > + gpio_request(ETHERNET_KS8851_QUART, "quart");
> > > > > + gpio_direction_output(ETHERNET_KS8851_QUART, 1);
> > > > > + gpio_request(ETHERNET_KS8851_IRQ, "ks8851");
> > > >
> > > > Any reason for not checking return value of gpio_request()?
> > > >
> > >
> > > Thought initially about them as dedicated lines for
> ethernet avoiding
> > > both reasons to check for a gpio's request:
> > >
> > > 1. invalid gpio
> > > 2. already claimed gpio
> >
> > You still need to check for the result.
> >
>
> Is the below approach ok? Using goto would make it better?
>
> int status;
>
> status = gpio_request(ETHERNET_KS8851_POWER_ENABLE,
> "ethernet");
> if (status < 0)
You need to have warning message about this failure.
> return status;
>
> gpio_request(ETHERNET_KS8851_QUART, "quart");
> if (status < 0) {
-Ditto-
> gpio_free(ETHERNET_KS8851_POWER_ENABLE);
> return status;
Return to where? This function seems to be void, change signature
of this API.
> }
>
> gpio_request(ETHERNET_KS8851_IRQ, "ks8851");
> if (status < 0) {
Bug! Checking previous status.
> gpio_free(ETHERNET_KS8851_POWER_ENABLE);
> gpio_free(ETHERNET_KS8851_QUART);
> return status;
> }
>
> gpio_direction_output(ETHERNET_KS8851_POWER_ENABLE, 1);
> gpio_direction_output(ETHERNET_KS8851_QUART, 1);
> gpio_direction_input(ETHERNET_KS8851_IRQ);
Goto will be better approach compared to above logic.
if(gpio_request(x)
goto err1;
if(gpio_request(y)
goto err2;
if(gpio_request(z)
goto err3;
...
return 0;
err3:
free(x);
err2:
free(y);
err1:
free(z);
return status;
-Manjunath --
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