5.4-stable review patch. If anyone has any objections, please let me know.
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From: Nick Bowler nbowler@draconx.ca
[ 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@draconx.ca Fixes: c6e126de43e7 ("of: Keep track of populated platform devices") Signed-off-by: Michael Ellerman mpe@ellerman.id.au Link: https://msgid.link/20240711035428.16696-1-nbowler@draconx.ca Signed-off-by: Sasha Levin sashal@kernel.org --- 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);