Re: clk: rockchip: Checking a kmemdup() call in rockchip_clk_register_pll()

[Heiko Stübner]

Hi Markus,

Am Samstag, 12. Oktober 2019, 15:55:44 CEST schrieb Markus Elfring:
> I tried another script for the semantic patch language out.
> This source code analysis approach points out that the implementation
> of the function ârockchip_clk_register_pllâ contains also a call
> of the function âkmemdupâ.
> 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 â%s: could not allocate
>   rate table for %s\nâ 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.

> * Is there a need to adjust the error handling here?

There is no need for additional error handling. 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.

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.

Heiko