linux-kernel - [PATCH RESEND] spi: zynqmp-gqspi: fix clock imbalance on probe failure

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Message-ID: <20230919083401.26454-1-johan+linaro@kernel.org>
Date:   Tue, 19 Sep 2023 10:34:01 +0200
From:   Johan Hovold <johan+linaro@...nel.org>
To:     Mark Brown <broonie@...nel.org>
Cc:     Michal Simek <michal.simek@....com>, linux-spi@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Johan Hovold <johan+linaro@...nel.org>, stable@...r.kernel.org,
        Naga Sureshkumar Relli <naga.sureshkumar.relli@...inx.com>,
        Shubhrajyoti Datta <shubhrajyoti.datta@...inx.com>
Subject: [PATCH RESEND] spi: zynqmp-gqspi: fix clock imbalance on probe failure

Make sure that the device is not runtime suspended before explicitly
disabling the clocks on probe failure and on driver unbind to avoid a
clock enable-count imbalance.

Fixes: 9e3a000362ae ("spi: zynqmp: Add pm runtime support")
Cc: stable@...r.kernel.org	# 4.19
Cc: Naga Sureshkumar Relli <naga.sureshkumar.relli@...inx.com>
Cc: Shubhrajyoti Datta <shubhrajyoti.datta@...inx.com>
Signed-off-by: Johan Hovold <johan+linaro@...nel.org>
---

Hi Mark,

This patch ended up sitting in your for-next and for-6.4 branches for a
few releases but was never sent on to Linus as I reported here:

	https://lore.kernel.org/lkml/ZOy0l6sXyYib59ej@finisterre.sirena.org.uk/

Now it appears to have been dropped from linux-next so resending.

Johan


 drivers/spi/spi-zynqmp-gqspi.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/drivers/spi/spi-zynqmp-gqspi.c b/drivers/spi/spi-zynqmp-gqspi.c
index 94d9a33d9af5..9a46b2478f4e 100644
--- a/drivers/spi/spi-zynqmp-gqspi.c
+++ b/drivers/spi/spi-zynqmp-gqspi.c
@@ -1340,9 +1340,9 @@ static int zynqmp_qspi_probe(struct platform_device *pdev)
 	return 0;
 
 clk_dis_all:
-	pm_runtime_put_sync(&pdev->dev);
-	pm_runtime_set_suspended(&pdev->dev);
 	pm_runtime_disable(&pdev->dev);
+	pm_runtime_put_noidle(&pdev->dev);
+	pm_runtime_set_suspended(&pdev->dev);
 	clk_disable_unprepare(xqspi->refclk);
 clk_dis_pclk:
 	clk_disable_unprepare(xqspi->pclk);
@@ -1366,11 +1366,15 @@ static void zynqmp_qspi_remove(struct platform_device *pdev)
 {
 	struct zynqmp_qspi *xqspi = platform_get_drvdata(pdev);
 
+	pm_runtime_get_sync(&pdev->dev);
+
 	zynqmp_gqspi_write(xqspi, GQSPI_EN_OFST, 0x0);
+
+	pm_runtime_disable(&pdev->dev);
+	pm_runtime_put_noidle(&pdev->dev);
+	pm_runtime_set_suspended(&pdev->dev);
 	clk_disable_unprepare(xqspi->refclk);
 	clk_disable_unprepare(xqspi->pclk);
-	pm_runtime_set_suspended(&pdev->dev);
-	pm_runtime_disable(&pdev->dev);
 }
 
 MODULE_DEVICE_TABLE(of, zynqmp_qspi_of_match);
-- 
2.41.0