Commit 020bf042 authored Dec 15, 2015 by Stefan Haberland Committed by Martin Schwidefsky Feb 11, 2016

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



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>

parent 0986d977

drivers/s390/block/dasd_alias.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -723,7 +723,7 @@ 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;

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