From: Stefan Haberland <s...@linux.vnet.ibm.com> 3.12-stable review patch. If anyone has any objections, please let me know.
=============== 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 <s...@linux.vnet.ibm.com> Reviewed-by: Sebastian Ott <seb...@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidef...@de.ibm.com> Signed-off-by: Jiri Slaby <jsl...@suse.cz> --- drivers/s390/block/dasd.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/drivers/s390/block/dasd.c b/drivers/s390/block/dasd.c index 846d5c6609d8..df2fd363734e 100644 --- a/drivers/s390/block/dasd.c +++ b/drivers/s390/block/dasd.c @@ -1612,9 +1612,18 @@ 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: " @@ -1630,7 +1639,6 @@ 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) && -- 2.10.0