The function of acpi_power_meter module on Dell system requires IPMI handler is installed and SMI is selected. So add a helper to let acpi_power_meter know when IPMI handler and SMI are ready. Signed-off-by: Kai-Heng Feng <kai.heng.feng@xxxxxxxxxxxxx> --- v3: - New patch. drivers/acpi/acpi_ipmi.c | 17 ++++++++++++++++- include/acpi/acpi_bus.h | 5 +++++ 2 files changed, 21 insertions(+), 1 deletion(-) diff --git a/drivers/acpi/acpi_ipmi.c b/drivers/acpi/acpi_ipmi.c index 0555f68c2dfd..54862cab7171 100644 --- a/drivers/acpi/acpi_ipmi.c +++ b/drivers/acpi/acpi_ipmi.c @@ -23,6 +23,8 @@ MODULE_LICENSE("GPL"); #define IPMI_TIMEOUT (5000) #define ACPI_IPMI_MAX_MSG_LENGTH 64 +static struct completion smi_selected; + struct acpi_ipmi_device { /* the device list attached to driver_data.ipmi_devices */ struct list_head head; @@ -463,8 +465,10 @@ static void ipmi_register_bmc(int iface, struct device *dev) if (temp->handle == handle) goto err_lock; } - if (!driver_data.selected_smi) + if (!driver_data.selected_smi) { driver_data.selected_smi = ipmi_device; + complete(&smi_selected); + } list_add_tail(&ipmi_device->head, &driver_data.ipmi_devices); mutex_unlock(&driver_data.ipmi_lock); @@ -578,10 +582,21 @@ acpi_ipmi_space_handler(u32 function, acpi_physical_address address, return status; } +int acpi_wait_for_acpi_ipmi(void) +{ + long ret; + + ret = wait_for_completion_interruptible_timeout(&smi_selected, 2 * HZ); + + return ret > 0 ? 0 : -ETIMEDOUT; +} +EXPORT_SYMBOL_GPL(acpi_wait_for_acpi_ipmi); + static int __init acpi_ipmi_init(void) { int result; acpi_status status; + init_completion(&smi_selected); if (acpi_disabled) return 0; diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h index 1216d72c650f..afa6e4d4bf46 100644 --- a/include/acpi/acpi_bus.h +++ b/include/acpi/acpi_bus.h @@ -821,11 +821,16 @@ static inline void acpi_put_acpi_dev(struct acpi_device *adev) { acpi_dev_put(adev); } + +int acpi_wait_for_acpi_ipmi(void); + #else /* CONFIG_ACPI */ static inline int register_acpi_bus_type(void *bus) { return 0; } static inline int unregister_acpi_bus_type(void *bus) { return 0; } +static inline int acpi_wait_for_acpi_ipmi(void) { return 0; } + #endif /* CONFIG_ACPI */ #endif /*__ACPI_BUS_H__*/ -- 2.34.1