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
