linux-kernel - [PATCH 2/2] spi: spi-fsl-dspi: Initialize completion before possible interrupt

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Message-Id: <1592132154-20175-2-git-send-email-krzk@kernel.org>
Date:   Sun, 14 Jun 2020 12:55:54 +0200
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Mark Brown <broonie@...nel.org>,
        Vladimir Oltean <vladimir.oltean@....com>,
        linux-spi@...r.kernel.org, linux-kernel@...r.kernel.org,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Marc Kleine-Budde <mkl@...gutronix.de>,
        Wolfram Sang <wsa@...nel.org>
Cc:     Krzysztof Kozlowski <krzk@...nel.org>, stable@...r.kernel.org
Subject: [PATCH 2/2] spi: spi-fsl-dspi: Initialize completion before possible interrupt

If interrupt fires early, the dspi_interrupt() could complete
(dspi->xfer_done) before its initialization happens.

Fixes: 4f5ee75ea171 ("spi: spi-fsl-dspi: Replace interruptible wait queue with a simple completion")
Cc: <stable@...r.kernel.org>
Signed-off-by: Krzysztof Kozlowski <krzk@...nel.org>
---
 drivers/spi/spi-fsl-dspi.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/spi/spi-fsl-dspi.c b/drivers/spi/spi-fsl-dspi.c
index 57e7a626ba00..efb63ed9fd86 100644
--- a/drivers/spi/spi-fsl-dspi.c
+++ b/drivers/spi/spi-fsl-dspi.c
@@ -1385,6 +1385,8 @@ static int dspi_probe(struct platform_device *pdev)
 		goto poll_mode;
 	}
 
+	init_completion(&dspi->xfer_done);
+
 	ret = request_threaded_irq(dspi->irq, dspi_interrupt, NULL,
 				   IRQF_SHARED, pdev->name, dspi);
 	if (ret < 0) {
@@ -1392,8 +1394,6 @@ static int dspi_probe(struct platform_device *pdev)
 		goto out_clk_put;
 	}
 
-	init_completion(&dspi->xfer_done);
-
 poll_mode:
 
 	if (dspi->devtype_data->trans_mode == DSPI_DMA_MODE) {
-- 
2.7.4