linux-kernel - [PATCH] S390 : Set SLI on PSF/PRSSD on Dasd ECKD initialisation

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Date:	Thu, 14 Aug 2008 20:26:51 +0200
From:	Ivan Warren <ivan@...acility.fr>
To:	schwidefsky@...ibm.com
Cc:	elendil@...net.nl, linux-s390@...r.kernel.org,
	linux-kernel@...r.kernel.org, Ivan Warren <ivan@...acility.fr>
Subject: [PATCH] S390 : Set SLI on PSF/PRSSD on Dasd ECKD initialisation

    s390 Dasd ECKD Driver issues a Perform Subsystem Function/Prepare
    for Read Subsystem Data with a length of 16.
    However, some hardware (namely 3990/9390 and some version of ESS)
    only take 12 bytes and therefore, an Incorrect Length indication is
    returned, breaking CCW Command Chaining and leads to a failure to
    initialize the DASD. This patch sets the SLI CCW bit to prevent an
    incorrect length indication to be reported when the control unit
    expects a length of 12 instead of 16.

Signed-off-by: Ivan Warren <ivan@...acility.fr>
---
 drivers/s390/block/dasd_eckd.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/s390/block/dasd_eckd.c b/drivers/s390/block/dasd_eckd.c
index 773b3fe..d644715 100644
--- a/drivers/s390/block/dasd_eckd.c
+++ b/drivers/s390/block/dasd_eckd.c
@@ -809,7 +809,7 @@ static int dasd_eckd_read_features(struct dasd_device *device)
 	ccw = cqr->cpaddr;
 	ccw->cmd_code = DASD_ECKD_CCW_PSF;
 	ccw->count = sizeof(struct dasd_psf_prssd_data);
-	ccw->flags |= CCW_FLAG_CC;
+	ccw->flags |= CCW_FLAG_CC|CCW_FLAG_SLI;
 	ccw->cda = (__u32)(addr_t) prssdp;
 
 	/* Read Subsystem Data - feature codes */
-- 
1.5.6.3

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