linux-kernel - [PATCH net-next v1 3/8] net: netconsole: move newline trimming to function

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Date: Wed, 24 Jan 2024 09:47:01 -0800
From: Matthew Wood <thepacketgeek@...il.com>
To: "David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Christian Brauner <brauner@...nel.org>
Cc: leitao@...ian.org,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH net-next v1 3/8] net: netconsole: move newline trimming to function

Move newline trimming logic from `dev_name_store()` to a new function
(trim_newline()) for shared use in netconsole.c

I was unable to find another useable version of this functionality that
wasn't private to another driver (E.g.
tools/testing/selftests/pidfd/pidfd_fdinfo_test.c)

Signed-off-by: Matthew Wood <thepacketgeek@...il.com>
---
 drivers/net/netconsole.c | 17 +++++++++++------
 1 file changed, 11 insertions(+), 6 deletions(-)

diff --git a/drivers/net/netconsole.c b/drivers/net/netconsole.c
index 5e720bcf7102..586945e62210 100644
--- a/drivers/net/netconsole.c
+++ b/drivers/net/netconsole.c
@@ -230,6 +230,16 @@ static struct netconsole_target *to_target(struct config_item *item)
 			    struct netconsole_target, group);
 }
 
+/* Get rid of possible trailing newline, returning the new length */
+static void trim_newline(char *s, size_t maxlen)
+{
+	size_t len;
+
+	len = strnlen(s, maxlen);
+	if (s[len - 1] == '\n')
+		s[len - 1] = '\0';
+}
+
 /*
  * Attribute operations for netconsole_target.
  */
@@ -424,7 +434,6 @@ static ssize_t dev_name_store(struct config_item *item, const char *buf,
 		size_t count)
 {
 	struct netconsole_target *nt = to_target(item);
-	size_t len;
 
 	mutex_lock(&dynamic_netconsole_mutex);
 	if (nt->enabled) {
@@ -435,11 +444,7 @@ static ssize_t dev_name_store(struct config_item *item, const char *buf,
 	}
 
 	strscpy(nt->np.dev_name, buf, IFNAMSIZ);
-
-	/* Get rid of possible trailing newline from echo(1) */
-	len = strnlen(nt->np.dev_name, IFNAMSIZ);
-	if (nt->np.dev_name[len - 1] == '\n')
-		nt->np.dev_name[len - 1] = '\0';
+	trim_newline(nt->np.dev_name, IFNAMSIZ);
 
 	mutex_unlock(&dynamic_netconsole_mutex);
 	return strnlen(buf, count);
-- 
2.43.0