linux-kernel - [RFC PATCH v1 01/50] IB/qib: Delete struct qib_ivdev.qp

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Date:   Wed, 27 Mar 2019 12:55:00 -0400
From:   George Spelvin <lkml@....org>
To:     linux-kernel@...r.kernel.org, lkml@....org
Cc:     Dennis Dalessandro <dennis.dalessandro@...el.com>,
        Mike Marciniszyn <mike.marciniszyn@...el.com>,
        linux-rdma@...r.kernel.org
Subject: [RFC PATCH v1 01/50] 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.

Signed-off-by: George Spelvin <lkml@....org>
Cc: Dennis Dalessandro <dennis.dalessandro@...el.com>
Cc: Mike Marciniszyn <mike.marciniszyn@...el.com>
Cc: linux-rdma@...r.kernel.org
---
 drivers/infiniband/hw/qib/qib_verbs.c | 2 --
 drivers/infiniband/hw/qib/qib_verbs.h | 1 -
 2 files changed, 3 deletions(-)

diff --git a/drivers/infiniband/hw/qib/qib_verbs.c b/drivers/infiniband/hw/qib/qib_verbs.c
index 5ef93f8f17a19..7508abb6a0fa1 100644
--- a/drivers/infiniband/hw/qib/qib_verbs.c
+++ b/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);
 
diff --git a/drivers/infiniband/hw/qib/qib_verbs.h b/drivers/infiniband/hw/qib/qib_verbs.h
index 8bf414b47b96b..dc0e81f3b6f4f 100644
--- a/drivers/infiniband/hw/qib/qib_verbs.h
+++ b/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;
-- 
2.26.0