Commit 3834e636 authored May 21, 2020 by Rafael J. Wysocki Committed by Greg Kroah-Hartman Jun 22, 2020

PM: runtime: clk: Fix clk_pm_runtime_get() error path



commit 64c7d7ea22d86cacb65d0c097cc447bc0e6d8abd upstream.

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: 9a34b453 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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

parent 1590ebfa

drivers/clk/clk.c

+5 −1

Original line number	Diff line number	Diff line
		@@ -101,7 +101,11 @@ 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)