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@xxxxxxxxxxxxx>
---
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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