linux-kernel - [PATCH] rbd: replace usage of found with dedicated list iterator variable

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Date:   Thu, 24 Mar 2022 08:20:50 +0100
From:   Jakob Koschel <jakobkoschel@...il.com>
To:     Ilya Dryomov <idryomov@...il.com>
Cc:     Dongsheng Yang <dongsheng.yang@...ystack.cn>,
        Jens Axboe <axboe@...nel.dk>, ceph-devel@...r.kernel.org,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        Mike Rapoport <rppt@...nel.org>,
        "Brian Johannesmeyer" <bjohannesmeyer@...il.com>,
        Cristiano Giuffrida <c.giuffrida@...nl>,
        "Bos, H.J." <h.j.bos@...nl>, Jakob Koschel <jakobkoschel@...il.com>
Subject: [PATCH] rbd: replace usage of found with dedicated list iterator variable

To move the list iterator variable into the list_for_each_entry_*()
macro in the future it should be avoided to use the list iterator
variable after the loop body.

To *never* use the list iterator variable after the loop it was
concluded to use a separate iterator variable instead of a
found boolean [1].

This removes the need to use a found variable and simply checking if
the variable was set, can determine if the break/goto was hit.

Link: https://lore.kernel.org/all/CAHk-=wgRr_D8CB-D9Kg-c=EHreAsk5SqXPwr9Y7k9sA6cWXJ6w@mail.gmail.com/
Signed-off-by: Jakob Koschel <jakobkoschel@...il.com>
---
 drivers/block/rbd.c | 13 ++++++-------
 1 file changed, 6 insertions(+), 7 deletions(-)

diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
index b844432bad20..e5f891d058e8 100644
--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -756,24 +756,23 @@ static struct rbd_client *__rbd_get_client(struct rbd_client *rbdc)
  */
 static struct rbd_client *rbd_client_find(struct ceph_options *ceph_opts)
 {
-	struct rbd_client *client_node;
-	bool found = false;
+	struct rbd_client *client_node = NULL, *iter;
 
 	if (ceph_opts->flags & CEPH_OPT_NOSHARE)
 		return NULL;
 
 	spin_lock(&rbd_client_list_lock);
-	list_for_each_entry(client_node, &rbd_client_list, node) {
-		if (!ceph_compare_options(ceph_opts, client_node->client)) {
-			__rbd_get_client(client_node);
+	list_for_each_entry(iter, &rbd_client_list, node) {
+		if (!ceph_compare_options(ceph_opts, iter->client)) {
+			__rbd_get_client(iter);
 
-			found = true;
+			client_node = iter;
 			break;
 		}
 	}
 	spin_unlock(&rbd_client_list_lock);
 
-	return found ? client_node : NULL;
+	return client_node;
 }
 
 /*

base-commit: f443e374ae131c168a065ea1748feac6b2e76613
-- 
2.25.1