From 22a94021e7d2b456c6abb59ad0a7ce4e94933d4a Mon Sep 17 00:00:00 2001 From: Sebastian Reichel Date: Thu, 4 May 2023 19:36:17 +0200 Subject: [PATCH] regulator: rk808: revert to synchronous probing The rk808 driver registers a bunch of regulator devices in a loop. If one of the later regulators fails to register (usually because its input supply is not yet available) everything will be unrolled (i.e. previously registered regulators will be unregistered). With asynchronous registration there might already be consumers, though. We do not have the necessary infrastructure to properly unregister the consumer device, so this scenario should be avoided. First checking all input supplies or disallowing usage of the regulators until all are registered does not work, since there can be self-references (e.g. DCDC channels providing the supply of LDOs). The only sensible solution I found is registering the regulator devices asynchronously, so that we do not have to unroll. Since this is a major rework let's revert back to synchronous probing for now to fix the issue at hand. Signed-off-by: Sebastian Reichel Link: https://lore.kernel.org/r/20230504173618.142075-14-sebastian.reichel@collabora.com Signed-off-by: Mark Brown --- drivers/regulator/rk808-regulator.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/regulator/rk808-regulator.c b/drivers/regulator/rk808-regulator.c index 71a1ca8b917e..5f14d6dd4593 100644 --- a/drivers/regulator/rk808-regulator.c +++ b/drivers/regulator/rk808-regulator.c @@ -1355,7 +1355,7 @@ static struct platform_driver rk808_regulator_driver = { .probe = rk808_regulator_probe, .driver = { .name = "rk808-regulator", - .probe_type = PROBE_PREFER_ASYNCHRONOUS, + .probe_type = PROBE_FORCE_SYNCHRONOUS, }, };