lkml.org 
[lkml]   [2021]   [Dec]   [9]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH 1/2] clk: clk_core_get() can also return NULL
From
Date
Quoting Stephen Boyd (2021-12-07 20:15:33)
> Nothing stops a clk controller from registering an OF clk provider
> before registering those clks with the clk framework. This is not great
> but we deal with it in the clk framework by refusing to hand out struct
> clk pointers when 'hw->core' is NULL, the indication that clk_register()
> has been called.
>
> Within clk_core_fill_parent_index() we considered this case when a
> clk_hw pointer is referenced directly by filling in the parent cache
> with an -EPROBE_DEFER pointer when the core pointer is NULL. When we
> lookup a parent with clk_core_get() we don't care about the return value
> being NULL though, because that was considered largely impossible, but
> it's been proven now that it can be NULL if two clk providers are
> probing in parallel and the parent provider has been registered before
> the clk has. Let's check for NULL here as well and treat it the same as
> direct clk_hw references.
>
> Signed-off-by: Stephen Boyd <sboyd@kernel.org>
> ---

Applied to clk-next

\
 
 \ /
  Last update: 2021-12-10 02:17    [W:0.024 / U:1.548 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site