IB/qib: Delete struct qib_ivdev.qp_rnd

I was checking the field to see if it needed the full get_random_bytes()
and discovered it's unused.

Only compile-tested, as I don't have the hardware, but I'm still pretty
confident.

Link: https://lore.kernel.org/r/202003281643.02SGh6eG002694@sdf.orgSigned-off-by: George Spelvin <lkml@sdf.org>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

drivers/infiniband/hw/qib/qib_verbs.c

@@ -39,7 +39,6 @@
 #include <linux/utsname.h>
 #include <linux/rculist.h>
 #include <linux/mm.h>
-#include <linux/random.h>
 #include <linux/vmalloc.h>
 #include <rdma/rdma_vt.h>
 
@@ -1503,7 +1502,6 @@ int qib_register_ib_device(struct qib_devdata *dd)
 	unsigned i, ctxt;
 	int ret;
 
-	get_random_bytes(&dev->qp_rnd, sizeof(dev->qp_rnd));
 	for (i = 0; i < dd->num_pports; i++)
 		init_ibport(ppd + i);
 

drivers/infiniband/hw/qib/qib_verbs.h

@@ -177,7 +177,6 @@ struct qib_ibdev {
 	struct timer_list mem_timer;
 	struct qib_pio_header *pio_hdrs;
 	dma_addr_t pio_hdrs_phys;
-	u32 qp_rnd; /* random bytes for hash */
 
 	u32 n_piowait;
 	u32 n_txwait;