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[PATCH 3.14 090/130] s390/dasd: prevent incorrect length error under z/VM after PAV changes

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  [PATCH 3.14 090/130] s390/dasd: prevent incorrect length error under z/VM after PAV changes Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-03-02 03:00 +0100

#1347568 — [PATCH 3.14 090/130] s390/dasd: prevent incorrect length error under z/VM after PAV changes

3.14-stable review patch.  If anyone has any objections, please let me know.

------------------

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
@@ -722,7 +722,7 @@ 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;

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