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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>
This commit is contained in:
Stefan Haberland 2017-03-22 10:30:40 +01:00 committed by Martin Schwidefsky
parent 2fa5ed7d87
commit ccd53fa226
1 changed files with 4 additions and 0 deletions
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4
drivers/s390/block/dasd_eckd.c
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@ -5172,6 +5172,10 @@ static int dasd_eckd_query_host_access(struct dasd_device *device,
if (!device->block && private->lcu->pav == HYPER_PAV) if (!device->block && private->lcu->pav == HYPER_PAV)
return -EOPNOTSUPP; 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 */, cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
sizeof(struct dasd_psf_prssd_data) + 1, sizeof(struct dasd_psf_prssd_data) + 1,
device); device);