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| author | Stefan Haberland <sth@linux.vnet.ibm.com> | 2016-08-08 14:08:17 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-09-07 08:32:41 +0200 |
| commit | 1473e6afbb1a37adba91aed61a62bbc0dd78634b (patch) | |
| tree | 8f6d946c562f09978457ba47cbf92416f797fbcd /drivers/s390 | |
| parent | 07adb640aa87c454cb0334a119111d5e5dfb13b7 (diff) | |
| download | lwn-1473e6afbb1a37adba91aed61a62bbc0dd78634b.tar.gz lwn-1473e6afbb1a37adba91aed61a62bbc0dd78634b.zip | |
s390/dasd: fix hanging device after clear subchannel
commit 9ba333dc55cbb9523553df973adb3024d223e905 upstream.
When a device is in a status where CIO has killed all I/O by itself the
interrupt for a clear request may not contain an irb to determine the
clear function. Instead it contains an error pointer -EIO.
This was ignored by the DASD int_handler leading to a hanging device
waiting for a clear interrupt.
Handle -EIO error pointer correctly for requests that are clear pending and
treat the clear as successful.
Signed-off-by: Stefan Haberland <sth@linux.vnet.ibm.com>
Reviewed-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/s390')
| -rw-r--r-- | drivers/s390/block/dasd.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/drivers/s390/block/dasd.c b/drivers/s390/block/dasd.c index 4abfbdb285ec..84c13dffa3a8 100644 --- a/drivers/s390/block/dasd.c +++ b/drivers/s390/block/dasd.c @@ -1584,9 +1584,18 @@ void dasd_int_handler(struct ccw_device *cdev, unsigned long intparm, unsigned long long now; int expires; + cqr = (struct dasd_ccw_req *) intparm; if (IS_ERR(irb)) { switch (PTR_ERR(irb)) { case -EIO: + if (cqr && cqr->status == DASD_CQR_CLEAR_PENDING) { + device = (struct dasd_device *) cqr->startdev; + cqr->status = DASD_CQR_CLEARED; + dasd_device_clear_timer(device); + wake_up(&dasd_flush_wq); + dasd_schedule_device_bh(device); + return; + } break; case -ETIMEDOUT: DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s: " @@ -1602,7 +1611,6 @@ void dasd_int_handler(struct ccw_device *cdev, unsigned long intparm, } now = get_tod_clock(); - cqr = (struct dasd_ccw_req *) intparm; /* check for conditions that should be handled immediately */ if (!cqr || !(scsw_dstat(&irb->scsw) == (DEV_STAT_CHN_END | DEV_STAT_DEV_END) && |