linux-kernel - Re: [PATCH v3 1/6] regulator: core: validate selector against linear_min

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Message-ID: <37ae7275-3c85-e94e-4ed1-95b6b901c2ed@nvidia.com>
Date:   Tue, 24 Nov 2020 13:41:16 +0000
From:   Jon Hunter <jonathanh@...dia.com>
To:     <Claudiu.Beznea@...rochip.com>, <lgirdwood@...il.com>,
        <broonie@...nel.org>
CC:     <s.hauer@...gutronix.de>, <ttynkkynen@...dia.com>,
        <linus.walleij@...aro.org>, <axel.lin@...ics.com>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-tegra@...r.kernel.org>
Subject: Re: [PATCH v3 1/6] regulator: core: validate selector against
 linear_min_sel


On 24/11/2020 11:14, Claudiu.Beznea@...rochip.com wrote:

...

> I would say that a solution would be to have a new helper to retrieve the
> linear_min_sel (e.g. regulator_min_sel()) and use this for all the
> consumers of regulator_list_voltage() and the other APIs that patch
> "regulator: core: validate selector against linear_min_sel" has changed
> (regulator_list_voltage_table(), regulator_set_voltage_time()). With this
> change the loop in find_vdd_map_entry_exact() should be b/w
> regulator_min_sel() and regulator_count_voltages().
> 
> Maybe Mark has a better solution for this.


By the way, I don't think that Tegra is alone here. I see some other
drivers doing some similar things [0][1][2] and so I am wondering if
this is going to be a problem for a few drivers.

Jon

[0]
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/mmc/core/regulator.c#n61
[1]
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/cpufreq/s3c2416-cpufreq.c#n263
[2]
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/leds/leds-regulator.c#n29

-- 
nvpublic