[PATCH 4/6] spi: dw: Use devm_spi_register_controller()

[Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>]

Calling spi_unregister_controller() during driver remove results in
freeing the SPI controller and the associated driver data. Using it
later in dw_spi_remove_host() is a use-after-free bug. Register the
controller with devm_spi_register_controller() instead which makes
calling spi_unregister_controller() unnecessary.

Signed-off-by: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>
---
 drivers/spi/spi-dw-core.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/spi/spi-dw-core.c b/drivers/spi/spi-dw-core.c
index 323c66c5db50..caeece6681b3 100644
--- a/drivers/spi/spi-dw-core.c
+++ b/drivers/spi/spi-dw-core.c
@@ -485,7 +485,7 @@ int dw_spi_add_host(struct device *dev, struct dw_spi *dws)
 		}
 	}
 
-	ret = spi_register_controller(master);
+	ret = devm_spi_register_controller(dev, master);
 	if (ret) {
 		dev_err(&master->dev, "problem registering spi master\n");
 		goto err_dma_exit;
@@ -509,8 +509,6 @@ void dw_spi_remove_host(struct dw_spi *dws)
 {
 	dw_spi_debugfs_remove(dws);
 
-	spi_unregister_controller(dws->master);
-
 	if (dws->dma_ops && dws->dma_ops->dma_exit)
 		dws->dma_ops->dma_exit(dws);
 
-- 
2.28.0