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ast-io: Rework ast_sio_is_enabled() test sequence
[ Upstream commit 6a4db4c ] The postcondition of probing with a lock sequence is easier to make correct than with unlock. The original implementation left SuperIO locked after execution which broke an assumption of some callers. Tested on Garrison, Palmetto without HIOMAP, Palmetto with HIOMAP and Witherspoon. Signed-off-by: Andrew Jeffery <andrew@aj.id.au> Signed-off-by: Stewart Smith <stewart@linux.ibm.com> Signed-off-by: Vasant Hegde <hegdevasant@linux.vnet.ibm.com>
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