From: Stefan Haberland Date: Tue, 15 Dec 2015 09:16:43 +0000 (+0100) Subject: s390/dasd: prevent incorrect length error under z/VM after PAV changes X-Git-Tag: v3.2.79~53 X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?p=pandora-kernel.git;a=commitdiff_plain;h=809216deaa2c3e3212a1f3d07cf1f102569fa698 s390/dasd: prevent incorrect length error under z/VM after PAV changes 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 Signed-off-by: Martin Schwidefsky Signed-off-by: Ben Hutchings --- diff --git a/drivers/s390/block/dasd_alias.c b/drivers/s390/block/dasd_alias.c index c388eda1e2b1..ed9c9808dbfa 100644 --- a/drivers/s390/block/dasd_alias.c +++ b/drivers/s390/block/dasd_alias.c @@ -749,7 +749,7 @@ 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;