cpufreq: ACPI: Prevent a warning when another frequency driver is loaded

The recent change to use platform devices to load ACPI PPC and PCC
drivers caused that a misleading warning is reported when a respective
module cannot be loaded because another CPU frequency driver is already
registered:

kernel: acpi-cpufreq: probe of acpi-cpufreq failed with error -17

Address it by changing the return code in acpi-cpufreq and pcc-cpufreq
for this case from -EEXIST to -ENODEV which silences the warning in
call_driver_probe().

The change has also a benefit for users of init_module() as this return
code is propagated out from the syscall. The previous -EEXIST code made
the callers, such as kmod, wrongly believe that the module was already
loaded instead of that it failed to load.

Fixes: 691a63712347 ("ACPI: cpufreq: Use platform devices to load ACPI PPC and PCC drivers")
Reported-by: Kevin Locke <kevin@kevinlocke.name>
Link: https://lore.kernel.org/lkml/ZFreh8SDMX67EaB6@kevinlocke.name/
Signed-off-by: Petr Pavlu <petr.pavlu@suse.com>
Tested-by: Kevin Locke <kevin@kevinlocke.name>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/cpufreq/acpi-cpufreq.c b/drivers/cpufreq/acpi-cpufreq.c
index 2990439..b2f05d2 100644 (file)
--- a/drivers/cpufreq/acpi-cpufreq.c
+++ b/drivers/cpufreq/acpi-cpufreq.c
@@ -975,7 +975,7 @@ static int __init acpi_cpufreq_probe(struct platform_device *pdev)
 
        /* don't keep reloading if cpufreq_driver exists */
        if (cpufreq_get_current_driver())
-               return -EEXIST;
+               return -ENODEV;
 
        pr_debug("%s\n", __func__);
 

diff --git a/drivers/cpufreq/pcc-cpufreq.c b/drivers/cpufreq/pcc-cpufreq.c
index 1d2cfea..73efbcf 100644 (file)
--- a/drivers/cpufreq/pcc-cpufreq.c
+++ b/drivers/cpufreq/pcc-cpufreq.c
@@ -583,7 +583,7 @@ static int __init pcc_cpufreq_probe(struct platform_device *pdev)
 
        /* Skip initialization if another cpufreq driver is there. */
        if (cpufreq_get_current_driver())
-               return -EEXIST;
+               return -ENODEV;
 
        if (acpi_disabled)
                return -ENODEV;