Re: [PATCH v2 1/2] platform: make platform_get_irq_optional() optional

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



Hello Andy,

On Mon, Feb 14, 2022 at 12:13:01PM +0200, Andy Shevchenko wrote:
> On Mon, Feb 14, 2022 at 08:13:51AM +0100, Uwe Kleine-König wrote:
> > On Sat, Feb 12, 2022 at 11:16:30PM +0300, Sergey Shtylyov wrote:
> > > This patch is based on the former Andy Shevchenko's patch:
> > > 
> > > https://lore.kernel.org/lkml/20210331144526.19439-1-andriy.shevchenko@xxxxxxxxxxxxxxx/
> > > 
> > > Currently platform_get_irq_optional() returns an error code even if IRQ
> > > resource simply has not been found.  It prevents the callers from being
> > > error code agnostic in their error handling:
> > > 
> > > 	ret = platform_get_irq_optional(...);
> > > 	if (ret < 0 && ret != -ENXIO)
> > > 		return ret; // respect deferred probe
> > > 	if (ret > 0)
> > > 		...we get an IRQ...
> > > 
> > > All other *_optional() APIs seem to return 0 or NULL in case an optional
> > > resource is not available.  Let's follow this good example, so that the
> > > callers would look like:
> > > 
> > > 	ret = platform_get_irq_optional(...);
> > > 	if (ret < 0)
> > > 		return ret;
> > > 	if (ret > 0)
> > > 		...we get an IRQ...
> > > 
> > > Reported-by: Matthias Schiffer <matthias.schiffer@xxxxxxxxxxxxxxx>
> > > Signed-off-by: Sergey Shtylyov <s.shtylyov@xxxxxx>
> > 
> > While this patch is better than v1, I still don't like it for the
> > reasons discussed for v1. (i.e. 0 isn't usable as a dummy value which I
> > consider the real advantage for the other _get_optional() functions.)
> 
> I think you haven't reacted anyhow to my point that you mixing apples and
> bananas together when comparing this 0 to the others _optional APIs.

Is this a question to me or Sergey?

I fully agree, when the 0 of platform_get_irq_optional is an apple and
the NULL of gpio_get_optional is a banana, I doubt "All other
*_optional() APIs seem to return 0 or NULL in case an optional resource
is not available.  Let's follow this good example, [...]".

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | https://www.pengutronix.de/ |

Attachment: signature.asc
Description: PGP signature


[Index of Archives]     [Kernel Newbies]     [Security]     [Netfilter]     [Bugtraq]     [Linux PPP]     [Linux FS]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Samba]     [Video 4 Linux]     [Linmodem]     [Device Mapper]     [Linux Kernel for ARM]

  Powered by Linux