From: Maximilian Luz luzmaximilian@gmail.com
[ Upstream commit 44acfc22c7d055d9c4f8f0974ee28422405b971a ]
When building the Surface Aggregator Module (SAM) core, registry, and other SAM client drivers as builtin modules (=y), proper initialization order is not guaranteed. Due to this, client driver registration (triggered by device registration in the registry) races against bus initialization in the core.
If any attempt is made at registering the device driver before the bus has been initialized (i.e. if bus initialization fails this race) driver registration will fail with a message similar to:
Driver surface_battery was unable to register with bus_type surface_aggregator because the bus was not initialized
Switch from module_init() to subsys_initcall() to resolve this issue. Note that the serdev subsystem uses postcore_initcall() so we are still able to safely register the serdev device driver for the core.
Fixes: c167b9c7e3d6 ("platform/surface: Add Surface Aggregator subsystem") Reported-by: Blaž Hrastnik blaz@mxxn.io Signed-off-by: Maximilian Luz luzmaximilian@gmail.com Link: https://lore.kernel.org/r/20220429195738.535751-1-luzmaximilian@gmail.com Reviewed-by: Hans de Goede hdegoede@redhat.com Signed-off-by: Hans de Goede hdegoede@redhat.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/platform/surface/aggregator/core.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/platform/surface/aggregator/core.c b/drivers/platform/surface/aggregator/core.c index c61bbeeec2df..54f86df77a37 100644 --- a/drivers/platform/surface/aggregator/core.c +++ b/drivers/platform/surface/aggregator/core.c @@ -816,7 +816,7 @@ static int __init ssam_core_init(void) err_bus: return status; } -module_init(ssam_core_init); +subsys_initcall(ssam_core_init);
static void __exit ssam_core_exit(void) {