From: Martin Schwidefsky <schwidefsky@de.ibm.com>
To: linux-kernel@vger.kernel.org, peter.oberparleiter@de.ibm.com
Subject: [patch] s390: lost interrupt after chpid vary off/on cycle.
Date: Mon, 7 Aug 2006 17:06:19 +0200 [thread overview]
Message-ID: <20060807150619.GC10416@skybase> (raw)
From: Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
[S390] lost interrupt after chpid vary off/on cycle.
I/O on a CCW device may stall if a channel path to that device is
logicaly varied off/on. A user I/O interrupt can get misinterpreted
as interrupt for an internal path verification operation due to a
missing check and is therefore never reported to the device driver.
Correct check for pending interruptions before starting path
verification.
Signed-off-by: Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
---
drivers/s390/cio/device_fsm.c | 1 +
1 files changed, 1 insertion(+)
diff -urpN linux-2.6/drivers/s390/cio/device_fsm.c linux-2.6-patched/drivers/s390/cio/device_fsm.c
--- linux-2.6/drivers/s390/cio/device_fsm.c 2006-08-07 14:14:29.000000000 +0200
+++ linux-2.6-patched/drivers/s390/cio/device_fsm.c 2006-08-07 14:14:44.000000000 +0200
@@ -772,6 +772,7 @@ ccw_device_online_verify(struct ccw_devi
stsch(sch->schid, &sch->schib);
if (sch->schib.scsw.actl != 0 ||
+ (sch->schib.scsw.stctl & SCSW_STCTL_STATUS_PEND) ||
(cdev->private->irb.scsw.stctl & SCSW_STCTL_STATUS_PEND)) {
/*
* No final status yet or final status not yet delivered
reply other threads:[~2006-08-07 15:06 UTC|newest]
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