diff options
| author | Hoan Tran <hotran@apm.com> | 2016-06-18 00:16:31 +0200 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2016-06-23 23:19:21 +0200 |
| commit | 8343c40d3de32ebfe8f48b043964e4ba0e7701f7 (patch) | |
| tree | 29b20eeabda8bb5f9ecc229112455262d67f8216 /drivers/acpi/cppc_acpi.c | |
| parent | Linux 4.7-rc4 (diff) | |
| download | linux-8343c40d3de32ebfe8f48b043964e4ba0e7701f7.tar.xz linux-8343c40d3de32ebfe8f48b043964e4ba0e7701f7.zip | |
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>
Diffstat (limited to 'drivers/acpi/cppc_acpi.c')
| -rw-r--r-- | drivers/acpi/cppc_acpi.c | 18 |
1 files changed, 12 insertions, 6 deletions
diff --git a/drivers/acpi/cppc_acpi.c b/drivers/acpi/cppc_acpi.c index 8adac69dba3d..f9be3150017c 100644 --- a/drivers/acpi/cppc_acpi.c +++ b/drivers/acpi/cppc_acpi.c @@ -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) |