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| author | Stefan Haberland <sth@linux.vnet.ibm.com> | 2016-08-09 15:58:48 +0200 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2016-08-11 09:29:14 +0200 |
| commit | af7752106e4f12b4ee47b4eca3e7ba4bcec6e7e5 (patch) | |
| tree | b2a576c4338d47658886d3263a6d7e6983bcba70 /drivers/s390 | |
| parent | 4d81aaa53c2dea220ddf88e19c33033d6cf4f8cb (diff) | |
| download | linux-stable-af7752106e4f12b4ee47b4eca3e7ba4bcec6e7e5.tar.gz linux-stable-af7752106e4f12b4ee47b4eca3e7ba4bcec6e7e5.tar.bz2 linux-stable-af7752106e4f12b4ee47b4eca3e7ba4bcec6e7e5.zip | |
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>
Diffstat (limited to 'drivers/s390')
| -rw-r--r-- | drivers/s390/block/dasd_eckd.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/s390/block/dasd_eckd.c b/drivers/s390/block/dasd_eckd.c index fd2eff440098..98bbec44bcd0 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" |