linux-kernel - [PATCH 11/12] staging: lustre: ldlm: remove unnecessary 'ownlocks' variable.

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Date:   Wed, 19 Jul 2017 09:26:47 +1000
From:   NeilBrown <neilb@...e.com>
To:     Oleg Drokin <oleg.drokin@...el.com>,
        Greg Kroah-Hartman <greg@...ah.com>,
        Andreas Dilger <andreas.dilger@...el.com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Lustre Development List <lustre-devel@...ts.lustre.org>
Subject: [PATCH 11/12] staging: lustre: ldlm: remove unnecessary 'ownlocks'
 variable.

Now that the code has been simplified, 'ownlocks' is not
necessary.

The loop which sets it exits with 'lock' having the same value as
'ownlocks', or point to the head of the list if ownlocks is NULL.

The current code then tests ownlocks and sets 'lock' to exact the
value that it currently has.

So discard 'ownlocks'.

Also remove unnecessary initialization of 'lock'.

Signed-off-by: NeilBrown <neilb@...e.com>
---
 drivers/staging/lustre/lustre/ldlm/ldlm_flock.c |   15 +++------------
 1 file changed, 3 insertions(+), 12 deletions(-)

diff --git a/drivers/staging/lustre/lustre/ldlm/ldlm_flock.c b/drivers/staging/lustre/lustre/ldlm/ldlm_flock.c
index 58227728a002..4e8808103437 100644
--- a/drivers/staging/lustre/lustre/ldlm/ldlm_flock.c
+++ b/drivers/staging/lustre/lustre/ldlm/ldlm_flock.c
@@ -115,8 +115,7 @@ static int ldlm_process_flock_lock(struct ldlm_lock *req)
 	struct ldlm_resource *res = req->l_resource;
 	struct ldlm_namespace *ns = ldlm_res_to_ns(res);
 	struct ldlm_lock *tmp;
-	struct ldlm_lock *ownlocks = NULL;
-	struct ldlm_lock *lock = NULL;
+	struct ldlm_lock *lock;
 	struct ldlm_lock *new = req;
 	struct ldlm_lock *new2 = NULL;
 	enum ldlm_mode mode = req->l_req_mode;
@@ -140,22 +139,14 @@ static int ldlm_process_flock_lock(struct ldlm_lock *req)
 	/* This loop determines where this processes locks start
 	 * in the resource lr_granted list.
 	 */
-	list_for_each_entry(lock, &res->lr_granted, l_res_link) {
-		if (ldlm_same_flock_owner(lock, req)) {
-			ownlocks = lock;
+	list_for_each_entry(lock, &res->lr_granted, l_res_link)
+		if (ldlm_same_flock_owner(lock, req))
 			break;
-		}
-	}
 
 	/* Scan the locks owned by this process to find the insertion point
 	 * (as locks are ordered), and to handle overlaps.
 	 * We may have to merge or split existing locks.
 	 */
-	if (ownlocks)
-		lock = ownlocks;
-	else
-		lock = list_entry(&res->lr_granted,
-				  struct ldlm_lock, l_res_link);
 	list_for_each_entry_safe_from(lock, tmp, &res->lr_granted, l_res_link) {
 
 		if (!ldlm_same_flock_owner(lock, new))