linux-kernel - [PATCH] cpufreq: fix up conversion to hotplug state machine

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Date:   Tue, 20 Sep 2016 16:56:28 +0200
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     peterz@...radead.org, rjw@...ysocki.net, mingo@...nel.org,
        hpa@...or.com, linux-kernel@...r.kernel.org, tglx@...utronix.de
Cc:     Borislav Petkov <bp@...en8.de>
Subject: [PATCH] cpufreq: fix up conversion to hotplug state machine

The function cpufreq_register_driver() returns zero on success and since
commit 27622b061eb4 ("cpufreq: Convert to hotplug state machine")
erroneously a positive number. Due to the "if (x) assume_error" construct
all callers assumed an error and things went south.
This patch resets the return value back to zero in the success case.

Fixes: 27622b061eb4 ("cpufreq: Convert to hotplug state machine")
Reported-by: Borislav Petkov <bp@...en8.de>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
---
 drivers/cpufreq/cpufreq.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index e0bc632a259e..8b44de4d7438 100644
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -2503,6 +2503,7 @@ int cpufreq_register_driver(struct cpufreq_driver *driver_data)
 	if (ret < 0)
 		goto err_if_unreg;
 	hp_online = ret;
+	ret = 0;
 
 	pr_debug("driver %s up and running\n", driver_data->name);
 	goto out;
-- 
2.9.3