linux-kernel - [patch] s390: lost interrupt after chpid vary off/on cycle.

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Message-ID: <20060807150619.GC10416@skybase>
Date:	Mon, 7 Aug 2006 17:06:19 +0200
From:	Martin Schwidefsky <schwidefsky@...ibm.com>
To:	linux-kernel@...r.kernel.org, peter.oberparleiter@...ibm.com
Subject: [patch] s390: lost interrupt after chpid vary off/on cycle.

From: Peter Oberparleiter <peter.oberparleiter@...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@...ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@...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
-
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