linux-kernel - Re: [PATCH v4 3/4] pwm: bcm2835: allow pwm driver to be used in atomic context

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Message-ID: <ZT4aTsQJ_LUzGYay@gofer.mess.org>
Date:   Sun, 29 Oct 2023 08:39:42 +0000
From:   Sean Young <sean@...s.org>
To:     Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>
Cc:     linux-media@...r.kernel.org, linux-pwm@...r.kernel.org,
        Ivaylo Dimitrov <ivo.g.dimitrov.75@...il.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Florian Fainelli <florian.fainelli@...adcom.com>,
        Broadcom internal kernel review list 
        <bcm-kernel-feedback-list@...adcom.com>,
        Ray Jui <rjui@...adcom.com>,
        Scott Branden <sbranden@...adcom.com>,
        linux-rpi-kernel@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 3/4] pwm: bcm2835: allow pwm driver to be used in
 atomic context

Hello Uwe,

On Fri, Oct 27, 2023 at 03:38:18PM +0200, Uwe Kleine-König wrote:
> On Fri, Oct 27, 2023 at 10:20:46AM +0100, Sean Young wrote:
> > +	pc->rate = clk_get_rate(pc->clk);
> > +	if (!pc->rate) {
> > +		dev_err(pc->dev, "failed to get clock rate\n");
> > +		ret = -EINVAL;
> 
> Other error paths in this driver use dev_err_probe(). The most compact
> way here would be:
> 
> 	ret = dev_err_probe(pc->dev, -EINVAL, "....");
> 
> but maybe
> 
> 	ret = -EINVAL;
> 	dev_err_probe(pc->dev, ret, "...");
> 
> is a bit easier to parse for a human?!

Using the same dev_err_probe() function for all error paths is nice, so
I will change it for the next version. This change will print the EINVAL
error as well which does not really add anything, but no harm done there.

Thanks,

Sean