[PATCH] acpi: cppc: Prevent cpc_desc_ptr points to the invalid data

[Hoan Tran]

When CPPC fails to request PCC channel, the CPC data is freed
and cpc_desc_ptr points to the invalid data. This change prevents
this issue by moving cpc_desc_ptr assignment after PCC channel
request.

Signed-off-by: Hoan Tran <hot...@apm.com>
---
 drivers/acpi/cppc_acpi.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/acpi/cppc_acpi.c b/drivers/acpi/cppc_acpi.c
index 8adac69..85fd8f7 100644
--- a/drivers/acpi/cppc_acpi.c
+++ b/drivers/acpi/cppc_acpi.c
@@ -595,9 +595,6 @@ int acpi_cppc_processor_probe(struct acpi_processor *pr)
        /* Store CPU Logical ID */
        cpc_ptr->cpu_id = pr->id;
 
-       /* Plug it into this CPUs CPC descriptor. */
-       per_cpu(cpc_desc_ptr, pr->id) = cpc_ptr;
-
        /* Parse PSD data for this CPU */
        ret = acpi_get_psd(cpc_ptr, handle);
        if (ret)
@@ -610,6 +607,9 @@ int acpi_cppc_processor_probe(struct acpi_processor *pr)
                        goto out_free;
        }
 
+       /* Plug PSD data into this CPUs CPC descriptor. */
+       per_cpu(cpc_desc_ptr, pr->id) = cpc_ptr;
+
        /* Everything looks okay */
        pr_debug("Parsed CPC struct for CPU: %d\n", pr->id);
 
-- 
1.9.1