[S390] dasd: check if raw track access is supported

To use raw track access some special storage server commands are
needed. Older storage hardware may not support these commands.
So check if raw track access is possible while setting the DASD
online.

Signed-off-by: Stefan Haberland <stefan.haberland@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>

diff --git a/drivers/s390/block/dasd_eckd.c b/drivers/s390/block/dasd_eckd.c
index 30fb979d684d0043d2b1f6b0aff2fda6ebe8cfcd..6e835c9fdfcba9b5c6e9e501d6921aefa266c012 100644 (file)
--- a/drivers/s390/block/dasd_eckd.c
+++ b/drivers/s390/block/dasd_eckd.c
@@ -1461,6 +1461,15 @@ dasd_eckd_check_characteristics(struct dasd_device *device)
                                "Read device characteristic failed, rc=%d", rc);
                goto out_err3;
        }
+
+       if ((device->features & DASD_FEATURE_USERAW) &&
+           !(private->rdc_data.facilities.RT_in_LR)) {
+               dev_err(&device->cdev->dev, "The storage server does not "
+                       "support raw-track access\n");
+               rc = -EINVAL;
+               goto out_err3;
+       }
+
        /* find the valid cylinder size */
        if (private->rdc_data.no_cyl == LV_COMPAT_CYL &&
            private->rdc_data.long_no_cyl)