[PATCH] s390: common i/o layer.

[PATCH] s390: common i/o layer.

From: Martin Schwidefsky <schwidefsky@de.ibm.com>

Common i/o layer fixes:
 - Improve blacklist argument parsing.
 - Fix device recognition for devices where SenseID fails.
 - Don't try to set a device online that has no driver.
 - Chain a release ccw to the unconditional reserve ccw for forced online.
 - Fix irb accumulation for pure status pending with eswf set.
 - Fix rc handling in qdio_shutdown.
 - Improve retry behavious for busy conditions on qdio.
 - Fix activity check in ccw_device_start/read_dev_chars and read_conf_data.