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ACPI / CPPC: Prevent cpc_desc_ptr points to the invalid data

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commit 2324d15447 upstream.

When CPPC fails to request a PCC channel, the CPC data is freed
and cpc_desc_ptr points to the invalid data.

Avoid this issue by moving the cpc_desc_ptr assignment after the PCC
channel request.

Signed-off-by: Hoan Tran <hotran@apm.com>
Acked-by: Ashwin Chaugule <ashwin.chaugule@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Hoan Tran 2016-05-25 12:09:23 -07:00 committed by Greg Kroah-Hartman
parent cd84d3158f
commit 5f009361d6
1 changed files with 3 additions and 3 deletions
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6
drivers/acpi/cppc_acpi.c
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@ -508,9 +508,6 @@ 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)
@ -523,6 +520,9 @@ 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);