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lpc: Introduce generic probe capability
[ Upstream commit 5684204 ] Introduce generic read and write probe functions that allow detection of valid addresses by way of synchronous testing for the SYNC no-response state. If the no-response state is detected the probe functions will return an error to the caller, who can do with it what they wish. In the process, rip out the naive mechanism for muting the equivalent asynchronous error logging (regretfully introduced recently by yours truly). Signed-off-by: Andrew Jeffery <andrew@aj.id.au> Signed-off-by: Stewart Smith <stewart@linux.ibm.com>
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