| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.4 096/342] s390/dasd: prevent incorrect length error under z/VM after PAV changes | Date | Tue, 01 Mar 2016 23:54:15 +0000 |
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4.4-stable review patch. If anyone has any objections, please let me know.
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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;
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