linux-kernel - [PATCH] [v2] spi: spi-zynqmp-gqspi: Fix runtime PM imbalance in zynqmp_qspi

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Date:   Mon, 12 Apr 2021 15:31:54 +0800
From:   Dinghao Liu <dinghao.liu@....edu.cn>
To:     dinghao.liu@....edu.cn, kjlu@....edu
Cc:     Mark Brown <broonie@...nel.org>,
        Michal Simek <michal.simek@...inx.com>,
        linux-spi@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] [v2] spi: spi-zynqmp-gqspi: Fix runtime PM imbalance in zynqmp_qspi_probe

There is a PM usage counter decrement after zynqmp_qspi_init_hw()
without any refcount increment, which leads to refcount leak.Add
a refcount increment to balance the refcount. Also set
auto_runtime_pm to resume suspended spi controller.

Signed-off-by: Dinghao Liu <dinghao.liu@....edu.cn>
---
changelog:

v2: - Add a refcount increment to fix refcout leak instead of the
      refcount decrement on error.
      Set ctlr->auto_runtime_pm = true.
---
 drivers/spi/spi-zynqmp-gqspi.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/spi/spi-zynqmp-gqspi.c b/drivers/spi/spi-zynqmp-gqspi.c
index c8fa6ee18ae7..8b21c7b0e7eb 100644
--- a/drivers/spi/spi-zynqmp-gqspi.c
+++ b/drivers/spi/spi-zynqmp-gqspi.c
@@ -1160,6 +1160,7 @@ static int zynqmp_qspi_probe(struct platform_device *pdev)
 	pm_runtime_set_autosuspend_delay(&pdev->dev, SPI_AUTOSUSPEND_TIMEOUT);
 	pm_runtime_set_active(&pdev->dev);
 	pm_runtime_enable(&pdev->dev);
+	pm_runtime_get_sync(&pdev->dev);
 	/* QSPI controller initializations */
 	zynqmp_qspi_init_hw(xqspi);
 
@@ -1187,6 +1188,7 @@ static int zynqmp_qspi_probe(struct platform_device *pdev)
 	ctlr->mode_bits = SPI_CPOL | SPI_CPHA | SPI_RX_DUAL | SPI_RX_QUAD |
 			    SPI_TX_DUAL | SPI_TX_QUAD;
 	ctlr->dev.of_node = np;
+	ctlr->auto_runtime_pm = true;
 
 	ret = devm_spi_register_controller(&pdev->dev, ctlr);
 	if (ret) {
-- 
2.17.1