linux-kernel - [PATCH 2/2] mfd: wm8994: Fix unbalanced calls to regulator_bulk

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Date:   Mon, 24 Feb 2020 14:51:23 +0100
From:   Marek Szyprowski <m.szyprowski@...sung.com>
To:     alsa-devel@...a-project.org, linux-kernel@...r.kernel.org
Cc:     Marek Szyprowski <m.szyprowski@...sung.com>,
        Mark Brown <broonie@...nel.org>,
        Sylwester Nawrocki <s.nawrocki@...sung.com>,
        Lee Jones <lee.jones@...aro.org>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
Subject: [PATCH 2/2] mfd: wm8994: Fix unbalanced calls to
 regulator_bulk_disable()

When runtime PM is enabled, regulators are being controlled by the
driver's suspend and resume callbacks. They are also unconditionally
enabled at driver's probe(), and disabled in remove() functions. Add
more calls to runtime PM framework to ensure that the device's runtime
PM state matches the regulators state:
1. at the end of probe() function: set runtime PM state to active, so
there will be no spurious call to resume();
2. in remove(), ensure that resume() is called before disabling runtime PM
management and unconditionally disabling the regulators.

Signed-off-by: Marek Szyprowski <m.szyprowski@...sung.com>
---
 drivers/mfd/wm8994-core.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/mfd/wm8994-core.c b/drivers/mfd/wm8994-core.c
index f15f12d8bccc..f2668f52a6bd 100644
--- a/drivers/mfd/wm8994-core.c
+++ b/drivers/mfd/wm8994-core.c
@@ -591,6 +591,7 @@ static int wm8994_device_init(struct wm8994 *wm8994, int irq)
 		goto err_irq;
 	}
 
+	pm_runtime_set_active(wm8994->dev);
 	pm_runtime_enable(wm8994->dev);
 	pm_runtime_idle(wm8994->dev);
 
@@ -610,7 +611,9 @@ static int wm8994_device_init(struct wm8994 *wm8994, int irq)
 
 static void wm8994_device_exit(struct wm8994 *wm8994)
 {
+	pm_runtime_get_sync(wm8994->dev);
 	pm_runtime_disable(wm8994->dev);
+	pm_runtime_put_noidle(wm8994->dev);
 	wm8994_irq_exit(wm8994);
 	regulator_bulk_disable(wm8994->num_supplies, wm8994->supplies);
 	regulator_bulk_free(wm8994->num_supplies, wm8994->supplies);
-- 
2.17.1