[4/5] spi: amd: Fix refcount underflow on remove

Commit Message

Lukas Wunner May 4, 2020, 11:12 a.m. UTC

The AMD SPI driver calls spi_master_put() in its ->remove() hook even
though the preceding call to spi_unregister_master() already drops a
ref, thus leading to a refcount underflow.  Drop the superfluous call
to spi_master_put().

This only leaves the call to spi_unregister_master() in the ->remove()
hook, so it's safe to change the ->probe() hook to use the devm version
of spi_register_master() and drop the ->remove() hook altogether.

Signed-off-by: Lukas Wunner <[e-mail]>
---
 drivers/spi/spi-amd.c | 13 +------------
 1 file changed, 1 insertion(+), 12 deletions(-)

Patch

diff --git a/drivers/spi/spi-amd.c b/drivers/spi/spi-amd.c
index d3e3516ef957..00f2f3405e08 100644
--- a/drivers/spi/spi-amd.c
+++ b/drivers/spi/spi-amd.c
@@ -282,7 +282,7 @@  static int amd_spi_probe(struct platform_device *pdev)
 	master->transfer_one_message = amd_spi_master_transfer;
 
 	/* Register the controller with SPI framework */
-	err = spi_register_master(master);
+	err = devm_spi_register_master(dev, master);
 	if (err) {
 		dev_err(dev, "error %d registering SPI controller\n", err);
 		goto err_free_master;
@@ -296,16 +296,6 @@  static int amd_spi_probe(struct platform_device *pdev)
 	return err;
 }
 
-static int amd_spi_remove(struct platform_device *pdev)
-{
-	struct amd_spi *amd_spi = platform_get_drvdata(pdev);
-
-	spi_unregister_master(amd_spi->master);
-	spi_master_put(amd_spi->master);
-
-	return 0;
-}
-
 static const struct acpi_device_id spi_acpi_match[] = {
 	{ "AMDI0061", 0 },
 	{},
@@ -318,7 +308,6 @@  static struct platform_driver amd_spi_driver = {
 		.acpi_match_table = ACPI_PTR(spi_acpi_match),
 	},
 	.probe = amd_spi_probe,
-	.remove = amd_spi_remove,
 };
 
 module_platform_driver(amd_spi_driver);