From: Markus Elfring <Markus.Elfring@web.de>
To: "Heiko Stübner" <heiko@sntech.de>,
linux-clk@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
linux-rockchip@lists.infradead.org,
kernel-janitors@vger.kernel.org
Cc: Stephen Boyd <sboyd@kernel.org>,
Michael Turquette <mturquette@baylibre.com>,
Aditya Pakki <pakki001@umn.edu>, Kangjie Lu <kjlu@umn.edu>,
LKML <linux-kernel@vger.kernel.org>,
Navid Emamdoost <emamd001@umn.edu>,
Stephen McCamant <smccaman@umn.edu>
Subject: Re: clk: rockchip: Checking a kmemdup() call in rockchip_clk_register_pll()
Date: Sun, 13 Oct 2019 10:45:09 +0200 [thread overview]
Message-ID: <29d12079-d888-e090-da5a-c407c13d696b@web.de> (raw)
In-Reply-To: <5801053.xxhhKtLrcJ@diego>
>> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/clk/rockchip/clk-pll.c?id=1c0cc5f1ae5ee5a6913704c0d75a6e99604ee30a#n913
>> https://elixir.bootlin.com/linux/v5.4-rc2/source/drivers/clk/rockchip/clk-pll.c#L913
>>
>> * Do you find the usage of the format string “%s: could not allocate
>> rate table for %s\n” still appropriate at this place?
>
> If there is an internal "no-memory" output from inside kmemdup now,
> I guess the one in the clock driver would be a duplicate and could go away.
How do you think about to recheck information sources around
the Linux allocation failure report?
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/process/coding-style.rst?id=da94001239cceb93c132a31928d6ddc4214862d5#n878
>> * Is there a need to adjust the error handling here?
>
> There is no need for additional error handling.
If you would like to omit the macro call “WARN”, I would expect also
to express a corresponding null pointer check.
> Like if the rate-table could not be duplicated,
> the clock will still report the correct clockrate
> you can just not set a new rate.
How much will a different system configuration matter finally?
(Do you really want to treat this setting as “optional”?)
> And for a system it's always better to have the clock driver present
> than for all device-drivers to fail probing. Especially as this start as
> core clock driver, so there is no deferring possible.
I imagine that such a view can be clarified further.
Regards,
Markus
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next prev parent reply other threads:[~2019-10-13 8:46 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-12 13:55 clk: rockchip: Checking a kmemdup() call in rockchip_clk_register_pll() Markus Elfring
2019-10-12 21:32 ` Heiko Stübner
2019-10-13 8:45 ` Markus Elfring [this message]
2019-10-13 21:49 ` Heiko Stuebner
2019-10-14 7:26 ` Markus Elfring
2019-10-15 20:29 ` Heiko Stuebner
2019-10-16 6:24 ` Markus Elfring
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