[PATCH 4.19 051/196] macintosh/therm_windtunnel: fix module unload.

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4.19-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Nick Bowler <nbowler@xxxxxxxxxx>

[ Upstream commit fd748e177194ebcbbaf98df75152a30e08230cc6 ]

The of_device_unregister call in therm_windtunnel's module_exit procedure
does not fully reverse the effects of of_platform_device_create in the
module_init prodedure.  Once you unload this module, it is impossible
to load it ever again since only the first of_platform_device_create
call on the fan node succeeds.

This driver predates first git commit, and it turns out back then
of_platform_device_create worked differently than it does today.
So this is actually an old regression.

The appropriate function to undo of_platform_device_create now appears
to be of_platform_device_destroy, and switching to use this makes it
possible to unload and load the module as expected.

Signed-off-by: Nick Bowler <nbowler@xxxxxxxxxx>
Fixes: c6e126de43e7 ("of: Keep track of populated platform devices")
Signed-off-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Link: https://msgid.link/20240711035428.16696-1-nbowler@xxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/macintosh/therm_windtunnel.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/macintosh/therm_windtunnel.c b/drivers/macintosh/therm_windtunnel.c
index a0d87ed9da696..63e99762a1656 100644
--- a/drivers/macintosh/therm_windtunnel.c
+++ b/drivers/macintosh/therm_windtunnel.c
@@ -549,7 +549,7 @@ g4fan_exit( void )
 	platform_driver_unregister( &therm_of_driver );
 
 	if( x.of_dev )
-		of_device_unregister( x.of_dev );
+		of_platform_device_destroy(&x.of_dev->dev, NULL);
 }
 
 module_init(g4fan_init);
-- 
2.43.0







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