Patch "s390/dasd: prevent incorrect length error under z/VM after PAV changes" has been added to the 4.4-stable tree

Patch "s390/dasd: prevent incorrect length error under z/VM after PAV changes" has been added to the 4.4-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    s390/dasd: prevent incorrect length error under z/VM after PAV changes

to the 4.4-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     s390-dasd-prevent-incorrect-length-error-under-z-vm-after-pav-changes.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 020bf042e5b397479c1174081b935d0ff15d1a64 Mon Sep 17 00:00:00 2001
From: Stefan Haberland <stefan.haberland@de.ibm.com>
Date: Tue, 15 Dec 2015 10:16:43 +0100
Subject: s390/dasd: prevent incorrect length error under z/VM after PAV changes

From: Stefan Haberland <stefan.haberland@de.ibm.com>

commit 020bf042e5b397479c1174081b935d0ff15d1a64 upstream.

The channel checks the specified length and the provided amount of
data for CCWs and provides an incorrect length error if the size does
not match. Under z/VM with simulation activated the length may get
changed. Having the suppress length indication bit set is stated as
good CCW coding practice and avoids errors under z/VM.

Signed-off-by: Stefan Haberland <stefan.haberland@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/s390/block/dasd_alias.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/s390/block/dasd_alias.c
+++ b/drivers/s390/block/dasd_alias.c
@@ -723,7 +723,7 @@ static int reset_summary_unit_check(stru
 	ASCEBC((char *) &cqr->magic, 4);
 	ccw = cqr->cpaddr;
 	ccw->cmd_code = DASD_ECKD_CCW_RSCK;
-	ccw->flags = 0 ;
+	ccw->flags = CCW_FLAG_SLI;
 	ccw->count = 16;
 	ccw->cda = (__u32)(addr_t) cqr->data;
 	((char *)cqr->data)[0] = reason;


Patches currently in stable-queue which might be from stefan.haberland@de.ibm.com are

queue-4.4/s390-dasd-prevent-incorrect-length-error-under-z-vm-after-pav-changes.patch
queue-4.4/s390-dasd-fix-refcount-for-pav-reassignment.patch