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Subject[PATCH 3.13.y-ckt 080/138] s390/dasd: prevent incorrect length error under z/VM after PAV changes
Date
3.13.11-ckt36 -stable review patch.  If anyone has any objections, please let me know.

---8<------------------------------------------------------------

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: Kamal Mostafa <kamal@canonical.com>
---
drivers/s390/block/dasd_alias.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/s390/block/dasd_alias.c b/drivers/s390/block/dasd_alias.c
index a2597e6..d52d7a2 100644
--- a/drivers/s390/block/dasd_alias.c
+++ b/drivers/s390/block/dasd_alias.c
@@ -722,7 +722,7 @@ static int reset_summary_unit_check(struct alias_lcu *lcu,
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;
--
2.7.0
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