From 64c7d7ea22d86cacb65d0c097cc447bc0e6d8abd Mon Sep 17 00:00:00 2001
From: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
Date: Thu, 21 May 2020 19:08:09 +0200
Subject: [PATCH] PM: runtime: clk: Fix clk_pm_runtime_get() error path
Git-commit: 64c7d7ea22d86cacb65d0c097cc447bc0e6d8abd
Patch-mainline: v5.8-rc1
References: git-fixes

clk_pm_runtime_get() assumes that the PM-runtime usage counter will
be dropped by pm_runtime_get_sync() on errors, which is not the case,
so PM-runtime references to devices acquired by the former are leaked
on errors returned by the latter.

Fix this by modifying clk_pm_runtime_get() to drop the reference if
pm_runtime_get_sync() returns an error.

Fixes: 9a34b45397e5 clk: Add support for runtime PM
Cc: 4.15+ <stable@vger.kernel.org> # 4.15+
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/clk/clk.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index 2dfb30b963c4..407f6919604c 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -114,7 +114,11 @@ static int clk_pm_runtime_get(struct clk_core *core)
 		return 0;
 
 	ret = pm_runtime_get_sync(core->dev);
-	return ret < 0 ? ret : 0;
+	if (ret < 0) {
+		pm_runtime_put_noidle(core->dev);
+		return ret;
+	}
+	return 0;
 }
 
 static void clk_pm_runtime_put(struct clk_core *core)
-- 
2.16.4