dell-wmi: Check if Dell WMI descriptor structure is valid
After examining existing DSDT ACPI tables of more laptops and looking into Dell WMI document mentioned in ML dicussion archived at http://www.spinics.net/lists/platform-driver-x86/msg07220.html we will parse and check WMI descriptor if contains expected data. It is because WMI descriptor contains interface version number and it is needed to know in next commit. Signed-off-by: Pali Rohár <pali.rohar@gmail.com> Tested-by: Gabriele Mazzotta <gabriele.mzt@gmail.com> Signed-off-by: Darren Hart <dvhart@linux.intel.com>
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