linux-kernel - [PATCH v2] spi: Don't have controller clean up spi device before driver unbind

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Date:   Wed,  5 May 2021 09:47:34 -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 v2] 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>
---

v1->v2:
- Made the clean up more symmetric. 

Lukas,

Can you test this one your end to make sure you don't have issues
anymore?

Thanks,
Saravana

 drivers/spi/spi.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index 2350d131871b..f23e288e6498 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -714,8 +714,6 @@ 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);
@@ -723,7 +721,9 @@ void spi_unregister_device(struct spi_device *spi)
 	if (ACPI_COMPANION(&spi->dev))
 		acpi_device_clear_enumerated(ACPI_COMPANION(&spi->dev));
 	device_remove_software_node(&spi->dev);
-	device_unregister(&spi->dev);
+	device_del(&spi->dev);
+	spi_cleanup(spi);
+	put_device(&spi->dev);
 }
 EXPORT_SYMBOL_GPL(spi_unregister_device);
 
-- 
2.31.1.527.g47e6f16901-goog