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authorSebastian Ott <sebott@linux.vnet.ibm.com>2008-12-25 13:39:15 +0100
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2008-12-25 13:39:11 +0100
commitd36f0c66389eb5e4dbd9b095eea252230ba3273e (patch)
treec6c8e470455544d6f7472b86d8b2f97741257c90 /drivers/s390
parentf444cc0e52523560a8dfc12f5374e5d5ecf5375b (diff)
downloadlinux-d36f0c66389eb5e4dbd9b095eea252230ba3273e.tar.bz2
[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>
Diffstat (limited to 'drivers/s390')
-rw-r--r--drivers/s390/cio/device.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/s390/cio/device.c b/drivers/s390/cio/device.c
index 6d714cf55064..23d5752349b5 100644
--- a/drivers/s390/cio/device.c
+++ b/drivers/s390/cio/device.c
@@ -1174,7 +1174,8 @@ void io_subchannel_init_config(struct subchannel *sch)
{
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;
}