linux-kernel - Re: [PATCH v2] clk: tegra: Use readl_relaxed_poll_timeout_atomic in tegra210_clock

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Date:   Thu, 19 Oct 2017 02:29:20 -0700
From:   Nicolin Chen <nicoleotsuka@...il.com>
To:     thierry.reding@...il.com, sboyd@...eaurora.org,
        pdeschrijver@...dia.com
Cc:     linux-kernel@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-clk@...r.kernel.org, jonathanh@...dia.com,
        mturquette@...libre.com, pgaikwad@...dia.com
Subject: Re: [PATCH v2] clk: tegra: Use readl_relaxed_poll_timeout_atomic in
 tegra210_clock_init

On Fri, Sep 15, 2017 at 12:10:13PM -0700, Nicolin Chen wrote:
> Below is the call trace of tegra210_init_pllu() function:
>   start_kernel()
>   -> time_init()
>   --> of_clk_init()
>   ---> tegra210_clock_init()
>   ----> tegra210_pll_init()
>   -----> tegra210_init_pllu()
> 
> Because the preemption is disabled in the start_kernel before calling
> time_init, tegra210_init_pllu is actually in an atomic context while
> it includes a readl_relaxed_poll_timeout that might sleep.
> 
> So this patch just changes this readl_relaxed_poll_timeout() to its
> atomic version.
> 
> Signed-off-by: Nicolin Chen <nicoleotsuka@...il.com>
> Acked-By: Peter De Schrijver <pdeschrijver@...dia.com>

Thierry, can you also take a look at this one? I sent a month ago. Thanks.