linux-kernel - Re: [PATCH] iio: adc: ti-ads1015: fix conversion when CONFIG

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Date:   Wed, 29 Jul 2020 11:26:51 +0300
From:   Maxim Kochetkov <fido_max@...ox.ru>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     bigunclemax@...il.com, Jonathan Cameron <jic23@...nel.org>,
        Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] iio: adc: ti-ads1015: fix conversion when CONFIG_PM is
 not set

In case of CONFIG_PM is not set:

static inline int __pm_runtime_suspend(struct device *dev, int rpmflags)
{
	return -ENOSYS;
}

and ads1015_read_raw failed at:

		ret = ads1015_set_power_state(data, false);
		if (ret < 0)
			goto release_direct;

29.07.2020 11:21, Andy Shevchenko wrote:
> On Wed, Jul 29, 2020 at 10:59:07AM +0300, Maxim Kochetkov wrote:
>> To stop conversion ads1015_set_power_state function use unimplemented
>> function pm_runtime_put_autosuspend if CONFIG_PM is not set.
>> If CONFIG_PM is disabled, there is no need to start/stop conversion.
>> Fix it by adding return 0 function variant if CONFIG_PM is not set.
> 
> I'm wondering if you check the real code (assembly) for any difference.
> 
> All calls AFAICS are statically defined in !CONFIG_PM case and compiler/linker
> should be clever enough to drop this completely. Isn't it the case?
>