s390/cio: recover from bad paths
In some situations we don't receive notification from firmware that a previously unusable channelpath is usable again. Schedule recovery for devices that return from path verification without using all potentially usable paths. The recovery thread will periodically trigger a path verification on the affected devices. Signed-off-by: NSebastian Ott <sebott@linux.vnet.ibm.com> Suggested-by: NPeter Oberparleiter <oberpar@linux.vnet.ibm.com> Reviewed-by: NPeter Oberparleiter <oberpar@linux.vnet.ibm.com> Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
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