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thermal: core: Do not fail cdev registration because of invalid initial state

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It is reported that commit 31a0fa0019 ("thermal/debugfs: Pass cooling
device state to thermal_debug_cdev_add()") causes the ACPI fan driver
to fail probing on some systems which turns out to be due to the _FST
control method returning an invalid value until _FSL is first evaluated
for the given fan.  If this happens, the .get_cur_state() cooling device
callback returns an error and __thermal_cooling_device_register() fails
as uses that callback after commit 31a0fa0019.

Arguably, _FST should not return an invalid value even if it is
evaluated before _FSL, so this may be regarded as a platform firmware
issue, but at the same time it is not a good enough reason for failing
the cooling device registration where the initial cooling device state
is only needed to initialize a thermal debug facility.

Accordingly, modify __thermal_cooling_device_register() to avoid
calling thermal_debug_cdev_add() instead of returning an error if the
initial .get_cur_state() callback invocation fails.

Fixes: 31a0fa0019 ("thermal/debugfs: Pass cooling device state to thermal_debug_cdev_add()")
Closes: https://lore.kernel.org/linux-acpi/20240530153727.843378-1-laura.nao@collabora.com
Reported-by: Laura Nao <laura.nao@collabora.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Tested-by: Laura Nao <laura.nao@collabora.com>
This commit is contained in:
Rafael J. Wysocki 2024-06-06 20:27:19 +02:00
parent ae2170d6ea
commit 1af89dedc8
1 changed files with 11 additions and 2 deletions
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13
drivers/thermal/thermal_core.c
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@ -999,9 +999,17 @@ __thermal_cooling_device_register(struct device_node *np,
if (ret)
goto out_cdev_type;
/*
* The cooling device's current state is only needed for debug
* initialization below, so a failure to get it does not cause
* the entire cooling device initialization to fail. However,
* the debug will not work for the device if its initial state
* cannot be determined and drivers are responsible for ensuring
* that this will not happen.
*/
ret = cdev->ops->get_cur_state(cdev, &current_state);
if (ret)
goto out_cdev_type;
current_state = ULONG_MAX;
thermal_cooling_device_setup_sysfs(cdev);
@ -1016,7 +1024,8 @@ __thermal_cooling_device_register(struct device_node *np,
return ERR_PTR(ret);
}
thermal_debug_cdev_add(cdev, current_state);
if (current_state <= cdev->max_state)
thermal_debug_cdev_add(cdev, current_state);
/* Add 'this' new cdev to the global cdev list */
mutex_lock(&thermal_list_lock);