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

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[ Upstream commit 020bf042e5 ]

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.

Cc: stable@vger.kernel.org
Signed-off-by: Stefan Haberland <stefan.haberland@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
This commit is contained in:
Stefan Haberland
2015-12-15 10:16:43 +01:00
committed by Sasha Levin
parent 4f55047bff
commit 2e35e9c467
1 changed files with 1 additions and 1 deletions
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2
drivers/s390/block/dasd_alias.c
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@@ -722,7 +722,7 @@ static int reset_summary_unit_check(struct alias_lcu *lcu,
ASCEBC((char *) &cqr->magic, 4); ASCEBC((char *) &cqr->magic, 4);
ccw = cqr->cpaddr; ccw = cqr->cpaddr;
ccw->cmd_code = DASD_ECKD_CCW_RSCK; ccw->cmd_code = DASD_ECKD_CCW_RSCK;
ccw->flags = 0 ; ccw->flags = CCW_FLAG_SLI;
ccw->count = 16; ccw->count = 16;
ccw->cda = (__u32)(addr_t) cqr->data; ccw->cda = (__u32)(addr_t) cqr->data;
((char *)cqr->data)[0] = reason; ((char *)cqr->data)[0] = reason;