linux-kernel - [PATCH v4 2/3] PM: domains: Make of_genpd_add_subdomain() to return -EPROBE

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Message-Id: <20210120015010.14191-3-digetx@gmail.com>
Date:   Wed, 20 Jan 2021 04:50:09 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Peter Geis <pgwipeout@...il.com>,
        Nicolas Chauvet <kwizart@...il.com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Kevin Hilman <khilman@...nel.org>,
        Peter De Schrijver <pdeschrijver@...dia.com>,
        Viresh Kumar <vireshk@...nel.org>,
        Stephen Boyd <sboyd@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Matt Merhar <mattmerhar@...tonmail.com>
Cc:     linux-kernel@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-pm@...r.kernel.org
Subject: [PATCH v4 2/3] PM: domains: Make of_genpd_add_subdomain() to return -EPROBE_DEFER

Driver of a power domain provider may not be ready at the time of
of_genpd_add_subdomain() invocation. Make this function to return
-EPROBE_DEFER instead of -ENOENT in order to remove a need from
power domain drivers to handle the error code specially.

Tested-by: Peter Geis <pgwipeout@...il.com>
Tested-by: Nicolas Chauvet <kwizart@...il.com>
Tested-by: Matt Merhar <mattmerhar@...tonmail.com>
[tested on NVIDIA Tegra20/30/124 SoCs]
Suggested-by: Ulf Hansson <ulf.hansson@...aro.org>
Reviewed-by: Ulf Hansson <ulf.hansson@...aro.org>
Reviewed-by: Viresh Kumar <viresh.kumar@...aro.org>
Signed-off-by: Dmitry Osipenko <digetx@...il.com>
---
 drivers/base/power/domain.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
index 0bd0cdc30393..def1299ad085 100644
--- a/drivers/base/power/domain.c
+++ b/drivers/base/power/domain.c
@@ -2466,7 +2466,7 @@ int of_genpd_add_subdomain(struct of_phandle_args *parent_spec,
 out:
 	mutex_unlock(&gpd_list_lock);
 
-	return ret;
+	return ret == -ENOENT ? -EPROBE_DEFER : ret;
 }
 EXPORT_SYMBOL_GPL(of_genpd_add_subdomain);
 
-- 
2.29.2