linux-kernel - [PATCH 1/2] cpuidle: dt: Return the correct numbers of parsed idle states

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Date:   Fri, 21 Oct 2022 17:10:12 +0200
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     "Rafael J . Wysocki" <rafael@...nel.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        linux-pm@...r.kernel.org
Cc:     Sudeep Holla <sudeep.holla@....com>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] cpuidle: dt: Return the correct numbers of parsed idle states

While we correctly skips to initialize an idle state from a disabled idle
state node in DT, the returned value from dt_init_idle_driver() don't get
adjusted accordingly. Instead the number of found idle state nodes are
returned, while the callers are expecting the number of successfully
initialized idle states from DT.

This leads to cpuidle drivers unnecessarily continues to initialize their
idle state specific data. Moreover, in the case when all idle states have
been disabled in DT, we would end up registering a cpuidle driver, rather
than relying on the default arch specific idle call.

Fixes: 9f14da345599 ("drivers: cpuidle: implement DT based idle states infrastructure")
Signed-off-by: Ulf Hansson <ulf.hansson@...aro.org>
---
 drivers/cpuidle/dt_idle_states.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/cpuidle/dt_idle_states.c b/drivers/cpuidle/dt_idle_states.c
index 252f2a9686a6..448bc796b0b4 100644
--- a/drivers/cpuidle/dt_idle_states.c
+++ b/drivers/cpuidle/dt_idle_states.c
@@ -223,6 +223,6 @@ int dt_init_idle_driver(struct cpuidle_driver *drv,
 	 * also be 0 on platforms with missing DT idle states or legacy DT
 	 * configuration predating the DT idle states bindings.
 	 */
-	return i;
+	return state_idx - start_idx;
 }
 EXPORT_SYMBOL_GPL(dt_init_idle_driver);
-- 
2.34.1