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The command string array is assumed to be indexable by a full u8, so it must have 256 entries (0-255), not just 255. A recent firmware change (apparently) started using the command 0xff for a notification to the host, causing the driver to crash in debug message/tracing code. Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>