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authorStefan Haberland <sth@linux.vnet.ibm.com>2016-08-09 13:58:48 (GMT)
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2016-08-11 07:29:14 (GMT)
commitaf7752106e4f12b4ee47b4eca3e7ba4bcec6e7e5 (patch)
treeb2a576c4338d47658886d3263a6d7e6983bcba70
parent4d81aaa53c2dea220ddf88e19c33033d6cf4f8cb (diff)
downloadlinux-af7752106e4f12b4ee47b4eca3e7ba4bcec6e7e5.tar.xz
s390/dasd: fix failing CUIR assignment under LPAR
On LPAR the read message buffer command should be executed on the path it was received on otherwise there is a chance that the CUIR assignment might be faulty and the wrong channel path is set online/offline. Fix by setting the path mask accordingly. On z/VM we might not be able to do I/O on this path but there it does not matter on which path the read message buffer command is executed. Therefor implement a retry with an open path mask. Signed-off-by: Stefan Haberland <sth@linux.vnet.ibm.com>
-rw-r--r--drivers/s390/block/dasd_eckd.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/s390/block/dasd_eckd.c b/drivers/s390/block/dasd_eckd.c
index fd2eff4..98bbec4 100644
--- a/drivers/s390/block/dasd_eckd.c
+++ b/drivers/s390/block/dasd_eckd.c
@@ -5078,6 +5078,8 @@ static int dasd_eckd_read_message_buffer(struct dasd_device *device,
return PTR_ERR(cqr);
}
+ cqr->lpm = lpum;
+retry:
cqr->startdev = device;
cqr->memdev = device;
cqr->block = NULL;
@@ -5122,6 +5124,14 @@ static int dasd_eckd_read_message_buffer(struct dasd_device *device,
(prssdp + 1);
memcpy(messages, message_buf,
sizeof(struct dasd_rssd_messages));
+ } else if (cqr->lpm) {
+ /*
+ * on z/VM we might not be able to do I/O on the requested path
+ * but instead we get the required information on any path
+ * so retry with open path mask
+ */
+ cqr->lpm = 0;
+ goto retry;
} else
DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
"Reading messages failed with rc=%d\n"