[alsa-devel] [PATCH] clk: x86: add "mclk" alias for Baytrail/Cherrytrail

[Stephen Boyd]

On 02/14, Pierre-Louis Bossart wrote:
> On 2/14/17 1:04 PM, Stephen Boyd wrote:
> >
> >This leaks an alias when the driver is removed. Honestly,
> >clk_add_alias() doesn't work well because of that problem. Can
> >you just add another lookup with the pointer you already have
> >instead of passing a NULL device to do a global lookup?
> 
> This is a builtin driver that cannot be configured as a module, is
> the leaked alias problematic?

Well we don't suppress driver unbinding via sysfs here, unless I
missed something, so the leak could be triggered that way.

> I don't mind trying something different but I am not familiar enough
> with the framework to understand what you are hinting at. Are you
> suggesting a change on the last parameter such as:
> 
> clk_add_alias("mclk", dev_name(&pdev->dev), "pmc_plt_clk_3", &pdev->dev)
> 

I mean:

 lookup = clkdev_hw_create(data->clks[3].hw, "mclk", NULL);

and then freeing that lookup with clkdev_drop in the remove of
the driver. "mclk" is really generic for a connection name
without an associated device id, so you may want to pass some
device as the last argument here, but dev_name(&pdev->dev) seems
odd because that's the clock controller device, not whatever
device would be calling clk_get() with this created lookup in
mind.

-- 
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project