1 files changed, 45 insertions, 0 deletions

diff --git a/drivers/s390/block/dasd.c b/drivers/s390/block/dasd.c
index e71929db8b06..977521013fe8 100644
--- a/drivers/s390/block/dasd.c
+++ b/drivers/s390/block/dasd.c
@@ -2174,6 +2174,51 @@ dasd_generic_notify(struct ccw_device *cdev, int event)
         return ret;
 }
 
+struct dasd_ccw_req * dasd_generic_build_rdc(struct dasd_device *device,
+                                             void *rdc_buffer,
+                                             int rdc_buffer_size, char *magic)
+{
+        struct dasd_ccw_req *cqr;
+        struct ccw1 *ccw;
+
+        cqr = dasd_smalloc_request(magic, 1 /* RDC */, rdc_buffer_size, device);
+
+        if (IS_ERR(cqr)) {
+                DEV_MESSAGE(KERN_WARNING, device, "%s",
+                            "Could not allocate RDC request");
+                return cqr;
+        }
+
+        ccw = cqr->cpaddr;
+        ccw->cmd_code = CCW_CMD_RDC;
+        ccw->cda = (__u32)(addr_t)rdc_buffer;
+        ccw->count = rdc_buffer_size;
+
+        cqr->device = device;
+        cqr->expires = 10*HZ;
+        clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
+        cqr->retries = 2;
+        cqr->buildclk = get_clock();
+        cqr->status = DASD_CQR_FILLED;
+        return cqr;
+}
+
+
+int dasd_generic_read_dev_chars(struct dasd_device *device, char *magic,
+                                void **rdc_buffer, int rdc_buffer_size)
+{
+        int ret;
+        struct dasd_ccw_req *cqr;
+
+        cqr = dasd_generic_build_rdc(device, *rdc_buffer, rdc_buffer_size,
+                                     magic);
+        if (IS_ERR(cqr))
+                return PTR_ERR(cqr);
+
+        ret = dasd_sleep_on(cqr);
+        dasd_sfree_request(cqr, cqr->device);
+        return ret;
+}
 
 static int __init
 dasd_init(void)