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Commit ef09ae75 authored by Stefan Haberland's avatar Stefan Haberland Committed by Sasha Levin
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s390/dasd: prevent incorrect length error under z/VM after PAV changes 



[ Upstream commit 020bf042e5b397479c1174081b935d0ff15d1a64 ]

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: default avatarStefan Haberland <stefan.haberland@de.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: default avatarSasha Levin <sasha.levin@oracle.com>
parent 0c7c5f3e

drivers/s390/block/dasd_alias.c

+1 −1
Original line number Diff line number Diff line
@@ -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;