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int340x_thermal/processor_thermal_device: return failure when

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there is no ACPI device object

processor_thermal_device driver needs ACPI support to work. Thus, the driver
probing should fail when there is no ACPI device object asscociated.

This fixes a NULL pointer dereference when the driver is loaded
with INT340X feature disabled in BIOS.

Reported-by: Chen Yu <yu.c.chen@intel.com>
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Tested-by: Chen Yu <yu.c.chen@intel.com>
This commit is contained in:
Zhang Rui
2015-01-04 16:35:59 +08:00
parent 014d9d5d0c
commit ad0f409051
1 changed files with 2 additions and 0 deletions
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2
drivers/thermal/int340x_thermal/processor_thermal_device.c
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@@ -130,6 +130,8 @@ static int proc_thermal_add(struct device *dev,
int ret;
adev = ACPI_COMPANION(dev);
if (!adev)
return -ENODEV;
status = acpi_evaluate_object(adev->handle, "PPCC", NULL, &buf);
if (ACPI_FAILURE(status))