[S390] cio: use pim to check for multipath.
To check if multipath is available we count the bits set in lpm,
which could change over time (via configure [on|off] of a path).
The following patch uses the pim (which is persistent) for this
decision.
Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/drivers/s390/cio/device.c b/drivers/s390/cio/device.c
index 6d714cf..23d5752 100644
--- a/drivers/s390/cio/device.c
+++ b/drivers/s390/cio/device.c
@@ -1174,7 +1174,8 @@
{
memset(&sch->config, 0, sizeof(sch->config));
sch->config.csense = 1;
- if ((sch->lpm & (sch->lpm - 1)) != 0)
+ /* Use subchannel mp mode when there is more than 1 installed CHPID. */
+ if ((sch->schib.pmcw.pim & (sch->schib.pmcw.pim - 1)) != 0)
sch->config.mp = 1;
}