s390/ap: enable sysfs attribute scans to force AP bus rescan
This patch switches the sysfs attribute /sys/bus/ap/scans from read-only to read-write. If there is something written to this attribute, an AP bus rescan is forced. If an AP bus scan is triggered this way a debug feature entry line reports this in /sys/kernel/debug/s390dbf/ap/sprintf. Signed-off-by: Harald Freudenberger <freude@linux.ibm.com> Reviewed-by: Jakob Naucke <naucke@linux.ibm.com> Reviewed-by: Juergen Christ <jchrist@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
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