linux-kernel - Re: [PATCH -next] pwm: pca9685: Remove set but not used variable 'pwm'

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Message-ID: <20200523201730.o7y7pent4hjtgia3@pengutronix.de>
Date:   Sat, 23 May 2020 22:17:30 +0200
From:   Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>
To:     Sven Van Asbroeck <thesven73@...il.com>
Cc:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        YueHaibing <yuehaibing@...wei.com>,
        Thierry Reding <thierry.reding@...il.com>,
        linux-pwm@...r.kernel.org, kernel-janitors@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH -next] pwm: pca9685: Remove set but not used variable
 'pwm'

On Thu, Jun 06, 2019 at 11:11:11AM -0400, Sven Van Asbroeck wrote:
> I was able to test the patch [1] exclusion mechanism without access to actual
> hardware - by giving it a dummy regmap. See patch below.
> 
> Test cases (all via sysfs):
> 1. verify requested pwm cannot be requested as gpio
> 2. verify requested gpio cannot be requested as pwm
> 3. verify pwm "all LEDs" cannot be used if pwms/gpios in use
> 4. verify pwms/gpios cannot be requested if pwm "all LEDs" in use
> 
> All test cases ok.
>  Obviously, I could not test multi-threaded correctness.
> 
> [1] https://lkml.org/lkml/2019/6/4/1039

Is this patch still relevant? A patch similar to YueHaibing's one was
merged in the meantime but I guess the underlying problem is still
relevant. Sven, do you care enough to recheck and create a patch on top
of a more recent tree?

Best regards
Uwe

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