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

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Date:   Thu, 24 Mar 2022 08:27:00 +0100
From:   Jakob Koschel <jakobkoschel@...il.com>
To:     Andreas Noever <andreas.noever@...il.com>
Cc:     Michael Jamet <michael.jamet@...el.com>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Yehezkel Bernat <YehezkelShB@...il.com>,
        linux-usb@...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] thunderbolt: 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/thunderbolt/ctl.c | 15 +++++++--------
 1 file changed, 7 insertions(+), 8 deletions(-)

diff --git a/drivers/thunderbolt/ctl.c b/drivers/thunderbolt/ctl.c
index 4986edfbdf67..e92c658dba1c 100644
--- a/drivers/thunderbolt/ctl.c
+++ b/drivers/thunderbolt/ctl.c
@@ -158,21 +158,20 @@ static bool tb_cfg_request_is_active(struct tb_cfg_request *req)
 static struct tb_cfg_request *
 tb_cfg_request_find(struct tb_ctl *ctl, struct ctl_pkg *pkg)
 {
-	struct tb_cfg_request *req;
-	bool found = false;
+	struct tb_cfg_request *req = NULL, *iter;
 
 	mutex_lock(&pkg->ctl->request_queue_lock);
-	list_for_each_entry(req, &pkg->ctl->request_queue, list) {
-		tb_cfg_request_get(req);
-		if (req->match(req, pkg)) {
-			found = true;
+	list_for_each_entry(iter, &pkg->ctl->request_queue, list) {
+		tb_cfg_request_get(iter);
+		if (iter->match(iter, pkg)) {
+			req = iter;
 			break;
 		}
-		tb_cfg_request_put(req);
+		tb_cfg_request_put(iter);
 	}
 	mutex_unlock(&pkg->ctl->request_queue_lock);
 
-	return found ? req : NULL;
+	return req;
 }
 
 /* utility functions */

base-commit: f443e374ae131c168a065ea1748feac6b2e76613
-- 
2.25.1