linux-kernel - Re: [PATCH v2 5/5] clk: Get runtime PM before walking tree for clk

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Date: Sun, 07 Apr 2024 19:37:00 -0700
From: Stephen Boyd <sboyd@...nel.org>
To: Michael Turquette <mturquette@...libre.com>, Stephen Boyd <sboyd@...nel.org>
Cc: linux-kernel@...r.kernel.org, linux-clk@...r.kernel.org, patches@...ts.linux.dev, linux-arm-msm@...r.kernel.org, Taniya Das <quic_tdas@...cinc.com>, Douglas Anderson <dianders@...omium.org>
Subject: Re: [PATCH v2 5/5] clk: Get runtime PM before walking tree for clk_summary

Quoting Stephen Boyd (2024-03-25 11:41:59)
> Similar to the previous commit, we should make sure that all devices are
> runtime resumed before printing the clk_summary through debugfs. Failure
> to do so would result in a deadlock if the thread is resuming a device
> to print clk state and that device is also runtime resuming in another
> thread, e.g the screen is turning on and the display driver is starting
> up. We remove the calls to clk_pm_runtime_{get,put}() in this path
> because they're superfluous now that we know the devices are runtime
> resumed. This also squashes a bug where the return value of
> clk_pm_runtime_get() wasn't checked, leading to an RPM count underflow
> on error paths.
> 
> Fixes: 1bb294a7981c ("clk: Enable/Disable runtime PM for clk_summary")
> Cc: Taniya Das <quic_tdas@...cinc.com>
> Cc: Douglas Anderson <dianders@...omium.org>
> Signed-off-by: Stephen Boyd <sboyd@...nel.org>
> ---

Applied to clk-fixes