linux-kernel - [PATCH v1] spi: Don't have controller clean up spi device before driver unbind

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Date:   Tue,  4 May 2021 20:14:16 -0700
From:   Saravana Kannan <saravanak@...gle.com>
To:     Mark Brown <broonie@...nel.org>,
        Saravana Kannan <saravanak@...gle.com>
Cc:     Lukas Wunner <lukas@...ner.de>, kernel-team@...roid.com,
        linux-spi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v1] spi: Don't have controller clean up spi device before
 driver unbind

When a spi device is unregistered and triggers a driver unbind, the
driver might need to access the spi device. So, don't have the
controller clean up the spi device before the driver is unbound. Clean
up the spi device after the driver is unbound.

Fixes: c7299fea6769 ("spi: Fix spi device unregister flow")
Reported-by: Lukas Wunner <lukas@...ner.de>
Signed-off-by: Saravana Kannan <saravanak@...gle.com>
---
Lukas,

Can you test this out please?

Thanks,
Saravana

 drivers/spi/spi.c | 15 +++++++--------
 1 file changed, 7 insertions(+), 8 deletions(-)

diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index 2350d131871b..b856f4a1e3a4 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -401,6 +401,12 @@ static int spi_probe(struct device *dev)
 	return ret;
 }
 
+static void spi_cleanup(struct spi_device *spi)
+{
+	if (spi->controller->cleanup)
+		spi->controller->cleanup(spi);
+}
+
 static int spi_remove(struct device *dev)
 {
 	const struct spi_driver		*sdrv = to_spi_driver(dev->driver);
@@ -415,6 +421,7 @@ static int spi_remove(struct device *dev)
 				 ERR_PTR(ret));
 	}
 
+	spi_cleanup(to_spi_device(dev));
 	dev_pm_domain_detach(dev, true);
 
 	return 0;
@@ -554,12 +561,6 @@ static int spi_dev_check(struct device *dev, void *data)
 	return 0;
 }
 
-static void spi_cleanup(struct spi_device *spi)
-{
-	if (spi->controller->cleanup)
-		spi->controller->cleanup(spi);
-}
-
 /**
  * spi_add_device - Add spi_device allocated with spi_alloc_device
  * @spi: spi_device to register
@@ -714,8 +715,6 @@ void spi_unregister_device(struct spi_device *spi)
 	if (!spi)
 		return;
 
-	spi_cleanup(spi);
-
 	if (spi->dev.of_node) {
 		of_node_clear_flag(spi->dev.of_node, OF_POPULATED);
 		of_node_put(spi->dev.of_node);
-- 
2.31.1.527.g47e6f16901-goog