------- Comment From brueck...@de.ibm.com 2016-03-18 07:45 EDT-------
Problem should be solved by a backport of the kernel upstream commit:
commit ce0c12b633846a47e103842149a5bac2e5d261ec
Author: Heiko Carstens <heiko.carst...@de.ibm.com>
Date: Tue Mar 1 12:58:06 2016 +0100
s390/dasd: fix diag 0x250 inline assembly
git commit 1ec2772e0c3c ("s390/diag: add a statistic for diagnose
calls") added function calls to gather diagnose statistics.
In case of the dasd diag driver the function call was added between a
register asm statement which initialized register r2 and the inline
assembly itself. The function call clobbers the contents of register
r2 and therefore the diag 0x250 call behaves in a more or less random
way.
Fix this by extracting the function call into a separate function like
we do everywhere else.
Fixes: 1ec2772e0c3c ("s390/diag: add a statistic for diagnose calls")
Cc: <sta...@vger.kernel.org> # 4.4+
Reported-and-tested-by: Stefan Haberland <s...@linux.vnet.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carst...@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidef...@de.ibm.com>
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https://bugs.launchpad.net/bugs/1553171
Title:
eckd dasd can not be set online when using "use_diag=1" mode
Status in linux package in Ubuntu:
New
Bug description:
== Comment: #0 - Peter Schmidt <pschm...@de.ibm.com> - 2016-03-01 04:41:23 ==
---Problem Description---
eckd dasd can not be set online when using "use_diag=1" mode
Contact Information = pschm...@de.ibm.com
---uname output---
Linux s3515023 4.4.0-7-generic #22-Ubuntu SMP Thu Feb 18 21:13:28 UTC 2016
s390x s390x s390x GNU/Linux
Machine Type = s390 z/VM Guest
---Debugger---
A debugger is not configured
---Steps to Reproduce---
try to set ldl formatted eckd dasd online when use_diag is enabled
use ldl formatted disk <dasd>
load driver "modprobe dasd_diag_mod"
set dasd offline "chccwdev -d 0.0.<dasd>"
enable diag mode for this dasd "/sys/bus/ccw/devices/0.0.<dasd># echo 1 >
use_diag"
set dasd online "chccwdev -e 0.0.<dasd>"
ERROR appears
root@xxxxxx:/sys/bus/ccw/devices/0.0.<dasd># chccwdev -e 0.0.<dasd>
Setting device 0.0.<dasd> online
Failed (Operation not supported)
Failed
Stack trace output:
no
Oops output:
no
System Dump Info:
The system is not configured to capture a system dump.
Device driver error code:
-95
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