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ACPI: CPPC: Return error if _CPC is invalid on a CPU 

Based on 8.4.7.1 section of ACPI 6.1 specification, if the platform
supports CPPC, the _CPC object must exist under all processor objects.
If cpc_desc_ptr pointer is invalid on any CPUs, acpi_get_psd_map()
should return error and CPPC cpufreq driver can not be registered.

Signed-off-by: Hoan Tran <hotran@apm.com>
Reviewed-by: Prashanth Prakash <pprakash@codeaurora.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Hoan Tran 2016-06-17 15:16:31 -07:00 committed by Rafael J. Wysocki
parent 33688abb28
commit 8343c40d3d
1 changed files with 12 additions and 6 deletions
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18
drivers/acpi/cppc_acpi.c
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@ -299,8 +299,10 @@ int acpi_get_psd_map(struct cpudata **all_cpu_data)
continue;
cpc_ptr = per_cpu(cpc_desc_ptr, i);
if (!cpc_ptr)
continue;
if (!cpc_ptr) {
retval = -EFAULT;
goto err_ret;
}
pdomain = &(cpc_ptr->domain_info);
cpumask_set_cpu(i, pr->shared_cpu_map);
@ -322,8 +324,10 @@ int acpi_get_psd_map(struct cpudata **all_cpu_data)
continue;
match_cpc_ptr = per_cpu(cpc_desc_ptr, j);
if (!match_cpc_ptr)
continue;
if (!match_cpc_ptr) {
retval = -EFAULT;
goto err_ret;
}
match_pdomain = &(match_cpc_ptr->domain_info);
if (match_pdomain->domain != pdomain->domain)
@ -353,8 +357,10 @@ int acpi_get_psd_map(struct cpudata **all_cpu_data)
continue;
match_cpc_ptr = per_cpu(cpc_desc_ptr, j);
if (!match_cpc_ptr)
continue;
if (!match_cpc_ptr) {
retval = -EFAULT;
goto err_ret;
}
match_pdomain = &(match_cpc_ptr->domain_info);
if (match_pdomain->domain != pdomain->domain)