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| author | Stefan Haberland <sth@linux.vnet.ibm.com> | 2016-08-08 14:08:17 +0200 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2016-08-10 10:12:16 +0200 |
| commit | 9ba333dc55cbb9523553df973adb3024d223e905 (patch) | |
| tree | ad18cc8f559abe33f5a44053080a4b206207dd03 /drivers/s390 | |
| parent | 9bce8b2cbebf9f11b41021ccb98c6b18d1796edd (diff) | |
| download | linux-stable-9ba333dc55cbb9523553df973adb3024d223e905.tar.gz linux-stable-9ba333dc55cbb9523553df973adb3024d223e905.tar.bz2 linux-stable-9ba333dc55cbb9523553df973adb3024d223e905.zip | |
s390/dasd: fix hanging device after clear subchannel
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>
Cc: stable@vger.kernel.org
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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 8973d34ce5ba..fb1b56a71475 100644 --- a/drivers/s390/block/dasd.c +++ b/drivers/s390/block/dasd.c @@ -1643,9 +1643,18 @@ void dasd_int_handler(struct ccw_device *cdev, unsigned long intparm, u8 *sense = NULL; 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: " @@ -1661,7 +1670,6 @@ 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) && |