From: Stefan Haberland <sth@linux.vnet.ibm.com>
Date: Wed, 22 Mar 2017 09:30:40 +0000 (+0100)
Subject: s390/dasd: check if query host access feature is supported
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=ccd53fa2261c2676258fe523d9201099f4d5ebc1;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git

s390/dasd: check if query host access feature is supported

Some storage servers might not support the query host access feature.
Check if the corresponding feature code is set.

Signed-off-by: Stefan Haberland <sth@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
---

diff --git a/drivers/s390/block/dasd_eckd.c b/drivers/s390/block/dasd_eckd.c
index 0b38217f8147..eb090e85b02e 100644
--- a/drivers/s390/block/dasd_eckd.c
+++ b/drivers/s390/block/dasd_eckd.c
@@ -5172,6 +5172,10 @@ static int dasd_eckd_query_host_access(struct dasd_device *device,
 	if (!device->block && private->lcu->pav == HYPER_PAV)
 		return -EOPNOTSUPP;
 
+	/* may not be supported by the storage server */
+	if (!(private->features.feature[14] & 0x80))
+		return -EOPNOTSUPP;
+
 	cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */	+ 1 /* RSSD */,
 				   sizeof(struct dasd_psf_prssd_data) + 1,
 				   device);