linux-kernel - spi: stm32-qspi: Fix unbalanced pm_runtime

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Date:   Wed, 29 Apr 2020 12:26:25 +0200
From:   <patrice.chotard@...com>
To:     Mark Brown <broonie@...nel.org>,
        Alexandre Torgue <alexandre.torgue@...com>
CC:     <mcoquelin.stm32@...il.com>, <linux-spi@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        Patrice Chotard <patrice.chotard@...com>
Subject: spi: stm32-qspi: Fix unbalanced pm_runtime_enable issue

From: Patrice Chotard <patrice.chotard@...com>

Issue detected by unbinding/binding the stm32 qspi driver as following:

root@...32mp2:~# echo 40430000.spi > /sys/bus/platform/drivers/stm32-qspi/404300
00.spi/driver/unbind
root@...32mp2:~# echo 40430000.spi > /sys/bus/platform/drivers/stm32-qspi/bind
[  969.864021] stm32-qspi 40430000.spi: Unbalanced pm_runtime_enable!
[  970.225161] spi-nor spi0.0: mx66u51235f (65536 Kbytes)
[  970.935721] spi-nor spi0.1: mx66u51235f (65536 Kbytes)

Fixes: 9d282c17b023 ("spi: stm32-qspi: Add pm_runtime support")

Signed-off-by: Patrice Chotard <patrice.chotard@...com>
---
 drivers/spi/spi-stm32-qspi.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/spi/spi-stm32-qspi.c b/drivers/spi/spi-stm32-qspi.c
index 2f2ea2c42d6e..3c44bb2fd9b1 100644
--- a/drivers/spi/spi-stm32-qspi.c
+++ b/drivers/spi/spi-stm32-qspi.c
@@ -555,10 +555,15 @@ static const struct spi_controller_mem_ops stm32_qspi_mem_ops = {
 
 static void stm32_qspi_release(struct stm32_qspi *qspi)
 {
+	pm_runtime_get_sync(qspi->dev);
 	/* disable qspi */
 	writel_relaxed(0, qspi->io_base + QSPI_CR);
 	stm32_qspi_dma_free(qspi);
 	mutex_destroy(&qspi->lock);
+	pm_runtime_put_noidle(qspi->dev);
+	pm_runtime_disable(qspi->dev);
+	pm_runtime_set_suspended(qspi->dev);
+	pm_runtime_dont_use_autosuspend(qspi->dev);
 	clk_disable_unprepare(qspi->clk);
 }
 
-- 
2.17.1