netconsole: introduce helpers for dynamic_netconsole_mutex lock/unlock

This commit introduces two helper functions to perform lock/unlock on
dynamic_netconsole_mutex providing no-op stub versions when compiled
without CONFIG_NETCONSOLE_DYNAMIC and refactors existing call sites to
use the new helpers.

This is done following kernel coding style guidelines, in preparation
for an upcoming change. It avoids the need for preprocessor conditionals
in the call site and keeps the logic easier to follow.

Signed-off-by: Andre Carvalho <asantostc@gmail.com>
Reviewed-by: Breno Leitao <leitao@debian.org>
Tested-by: Breno Leitao <leitao@debian.org>
Link: https://patch.msgid.link/20260118-netcons-retrigger-v11-5-4de36aebcf48@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

1 files changed, 58 insertions, 39 deletions

diff --git a/drivers/net/netconsole.c b/drivers/net/netconsole.c
index 02a3463e8d24..46d990f3d904 100644
--- a/drivers/net/netconsole.c
+++ b/drivers/net/netconsole.c
@@ -213,6 +213,16 @@ static void netconsole_target_put(struct netconsole_target *nt)
 		config_group_put(&nt->group);
 }
 
+static void dynamic_netconsole_mutex_lock(void)
+{
+	mutex_lock(&dynamic_netconsole_mutex);
+}
+
+static void dynamic_netconsole_mutex_unlock(void)
+{
+	mutex_unlock(&dynamic_netconsole_mutex);
+}
+
 #else	/* !CONFIG_NETCONSOLE_DYNAMIC */
 
 static int __init dynamic_netconsole_init(void)
@@ -240,6 +250,15 @@ static void populate_configfs_item(struct netconsole_target *nt,
 				   int cmdline_count)
 {
 }
+
+static void dynamic_netconsole_mutex_lock(void)
+{
+}
+
+static void dynamic_netconsole_mutex_unlock(void)
+{
+}
+
 #endif	/* CONFIG_NETCONSOLE_DYNAMIC */
 
 /* Check if the target was bound by mac address. */
@@ -495,9 +514,9 @@ static ssize_t sysdata_cpu_nr_enabled_show(struct config_item *item, char *buf)
 	struct netconsole_target *nt = to_target(item->ci_parent);
 	bool cpu_nr_enabled;
 
-	mutex_lock(&dynamic_netconsole_mutex);
+	dynamic_netconsole_mutex_lock();
 	cpu_nr_enabled = !!(nt->sysdata_fields & SYSDATA_CPU_NR);
-	mutex_unlock(&dynamic_netconsole_mutex);
+	dynamic_netconsole_mutex_unlock();
 
 	return sysfs_emit(buf, "%d\n", cpu_nr_enabled);
 }
@@ -509,9 +528,9 @@ static ssize_t sysdata_taskname_enabled_show(struct config_item *item,
 	struct netconsole_target *nt = to_target(item->ci_parent);
 	bool taskname_enabled;
 
-	mutex_lock(&dynamic_netconsole_mutex);
+	dynamic_netconsole_mutex_lock();
 	taskname_enabled = !!(nt->sysdata_fields & SYSDATA_TASKNAME);
-	mutex_unlock(&dynamic_netconsole_mutex);
+	dynamic_netconsole_mutex_unlock();
 
 	return sysfs_emit(buf, "%d\n", taskname_enabled);
 }
@@ -522,9 +541,9 @@ static ssize_t sysdata_release_enabled_show(struct config_item *item,
 	struct netconsole_target *nt = to_target(item->ci_parent);
 	bool release_enabled;
 
-	mutex_lock(&dynamic_netconsole_mutex);
+	dynamic_netconsole_mutex_lock();
 	release_enabled = !!(nt->sysdata_fields & SYSDATA_TASKNAME);
-	mutex_unlock(&dynamic_netconsole_mutex);
+	dynamic_netconsole_mutex_unlock();
 
 	return sysfs_emit(buf, "%d\n", release_enabled);
 }
@@ -562,9 +581,9 @@ static ssize_t sysdata_msgid_enabled_show(struct config_item *item,
 	struct netconsole_target *nt = to_target(item->ci_parent);
 	bool msgid_enabled;
 
-	mutex_lock(&dynamic_netconsole_mutex);
+	dynamic_netconsole_mutex_lock();
 	msgid_enabled = !!(nt->sysdata_fields & SYSDATA_MSGID);
-	mutex_unlock(&dynamic_netconsole_mutex);
+	dynamic_netconsole_mutex_unlock();
 
 	return sysfs_emit(buf, "%d\n", msgid_enabled);
 }
@@ -584,7 +603,7 @@ static ssize_t enabled_store(struct config_item *item,
 	unsigned long flags;
 	ssize_t ret;
 
-	mutex_lock(&dynamic_netconsole_mutex);
+	dynamic_netconsole_mutex_lock();
 	ret = kstrtobool(buf, &enabled);
 	if (ret)
 		goto out_unlock;
@@ -660,7 +679,7 @@ static ssize_t enabled_store(struct config_item *item,
 	/* Deferred cleanup */
 	netconsole_process_cleanups();
 out_unlock:
-	mutex_unlock(&dynamic_netconsole_mutex);
+	dynamic_netconsole_mutex_unlock();
 	return ret;
 }
 
@@ -671,7 +690,7 @@ static ssize_t release_store(struct config_item *item, const char *buf,
 	bool release;
 	ssize_t ret;
 
-	mutex_lock(&dynamic_netconsole_mutex);
+	dynamic_netconsole_mutex_lock();
 	if (nt->state == STATE_ENABLED) {
 		pr_err("target (%s) is enabled, disable to update parameters\n",
 		       config_item_name(&nt->group.cg_item));
@@ -687,7 +706,7 @@ static ssize_t release_store(struct config_item *item, const char *buf,
 
 	ret = strnlen(buf, count);
 out_unlock:
-	mutex_unlock(&dynamic_netconsole_mutex);
+	dynamic_netconsole_mutex_unlock();
 	return ret;
 }
 
@@ -698,7 +717,7 @@ static ssize_t extended_store(struct config_item *item, const char *buf,
 	bool extended;
 	ssize_t ret;
 
-	mutex_lock(&dynamic_netconsole_mutex);
+	dynamic_netconsole_mutex_lock();
 	if (nt->state == STATE_ENABLED)  {
 		pr_err("target (%s) is enabled, disable to update parameters\n",
 		       config_item_name(&nt->group.cg_item));
@@ -713,7 +732,7 @@ static ssize_t extended_store(struct config_item *item, const char *buf,
 	nt->extended = extended;
 	ret = strnlen(buf, count);
 out_unlock:
-	mutex_unlock(&dynamic_netconsole_mutex);
+	dynamic_netconsole_mutex_unlock();
 	return ret;
 }
 
@@ -722,18 +741,18 @@ static ssize_t dev_name_store(struct config_item *item, const char *buf,
 {
 	struct netconsole_target *nt = to_target(item);
 
-	mutex_lock(&dynamic_netconsole_mutex);
+	dynamic_netconsole_mutex_lock();
 	if (nt->state == STATE_ENABLED) {
 		pr_err("target (%s) is enabled, disable to update parameters\n",
 		       config_item_name(&nt->group.cg_item));
-		mutex_unlock(&dynamic_netconsole_mutex);
+		dynamic_netconsole_mutex_unlock();
 		return -EINVAL;
 	}
 
 	strscpy(nt->np.dev_name, buf, IFNAMSIZ);
 	trim_newline(nt->np.dev_name, IFNAMSIZ);
 
-	mutex_unlock(&dynamic_netconsole_mutex);
+	dynamic_netconsole_mutex_unlock();
 	return strnlen(buf, count);
 }
 
@@ -743,7 +762,7 @@ static ssize_t local_port_store(struct config_item *item, const char *buf,
 	struct netconsole_target *nt = to_target(item);
 	ssize_t ret = -EINVAL;
 
-	mutex_lock(&dynamic_netconsole_mutex);
+	dynamic_netconsole_mutex_lock();
 	if (nt->state == STATE_ENABLED) {
 		pr_err("target (%s) is enabled, disable to update parameters\n",
 		       config_item_name(&nt->group.cg_item));
@@ -755,7 +774,7 @@ static ssize_t local_port_store(struct config_item *item, const char *buf,
 		goto out_unlock;
 	ret = strnlen(buf, count);
 out_unlock:
-	mutex_unlock(&dynamic_netconsole_mutex);
+	dynamic_netconsole_mutex_unlock();
 	return ret;
 }
 
@@ -765,7 +784,7 @@ static ssize_t remote_port_store(struct config_item *item,
 	struct netconsole_target *nt = to_target(item);
 	ssize_t ret = -EINVAL;
 
-	mutex_lock(&dynamic_netconsole_mutex);
+	dynamic_netconsole_mutex_lock();
 	if (nt->state == STATE_ENABLED) {
 		pr_err("target (%s) is enabled, disable to update parameters\n",
 		       config_item_name(&nt->group.cg_item));
@@ -777,7 +796,7 @@ static ssize_t remote_port_store(struct config_item *item,
 		goto out_unlock;
 	ret = strnlen(buf, count);
 out_unlock:
-	mutex_unlock(&dynamic_netconsole_mutex);
+	dynamic_netconsole_mutex_unlock();
 	return ret;
 }
 
@@ -788,7 +807,7 @@ static ssize_t local_ip_store(struct config_item *item, const char *buf,
 	ssize_t ret = -EINVAL;
 	int ipv6;
 
-	mutex_lock(&dynamic_netconsole_mutex);
+	dynamic_netconsole_mutex_lock();
 	if (nt->state == STATE_ENABLED) {
 		pr_err("target (%s) is enabled, disable to update parameters\n",
 		       config_item_name(&nt->group.cg_item));
@@ -802,7 +821,7 @@ static ssize_t local_ip_store(struct config_item *item, const char *buf,
 
 	ret = strnlen(buf, count);
 out_unlock:
-	mutex_unlock(&dynamic_netconsole_mutex);
+	dynamic_netconsole_mutex_unlock();
 	return ret;
 }
 
@@ -813,7 +832,7 @@ static ssize_t remote_ip_store(struct config_item *item, const char *buf,
 	ssize_t ret = -EINVAL;
 	int ipv6;
 
-	mutex_lock(&dynamic_netconsole_mutex);
+	dynamic_netconsole_mutex_lock();
 	if (nt->state == STATE_ENABLED) {
 		pr_err("target (%s) is enabled, disable to update parameters\n",
 		       config_item_name(&nt->group.cg_item));
@@ -827,7 +846,7 @@ static ssize_t remote_ip_store(struct config_item *item, const char *buf,
 
 	ret = strnlen(buf, count);
 out_unlock:
-	mutex_unlock(&dynamic_netconsole_mutex);
+	dynamic_netconsole_mutex_unlock();
 	return ret;
 }
 
@@ -848,7 +867,7 @@ static ssize_t remote_mac_store(struct config_item *item, const char *buf,
 	u8 remote_mac[ETH_ALEN];
 	ssize_t ret = -EINVAL;
 
-	mutex_lock(&dynamic_netconsole_mutex);
+	dynamic_netconsole_mutex_lock();
 	if (nt->state == STATE_ENABLED) {
 		pr_err("target (%s) is enabled, disable to update parameters\n",
 		       config_item_name(&nt->group.cg_item));
@@ -863,7 +882,7 @@ static ssize_t remote_mac_store(struct config_item *item, const char *buf,
 
 	ret = strnlen(buf, count);
 out_unlock:
-	mutex_unlock(&dynamic_netconsole_mutex);
+	dynamic_netconsole_mutex_unlock();
 	return ret;
 }
 
@@ -984,7 +1003,7 @@ static ssize_t userdatum_value_store(struct config_item *item, const char *buf,
 		return -EMSGSIZE;
 
 	mutex_lock(&netconsole_subsys.su_mutex);
-	mutex_lock(&dynamic_netconsole_mutex);
+	dynamic_netconsole_mutex_lock();
 
 	ret = strscpy(udm->value, buf, sizeof(udm->value));
 	if (ret < 0)
@@ -998,7 +1017,7 @@ static ssize_t userdatum_value_store(struct config_item *item, const char *buf,
 		goto out_unlock;
 	ret = count;
 out_unlock:
-	mutex_unlock(&dynamic_netconsole_mutex);
+	dynamic_netconsole_mutex_unlock();
 	mutex_unlock(&netconsole_subsys.su_mutex);
 	return ret;
 }
@@ -1026,7 +1045,7 @@ static ssize_t sysdata_msgid_enabled_store(struct config_item *item,
 		return ret;
 
 	mutex_lock(&netconsole_subsys.su_mutex);
-	mutex_lock(&dynamic_netconsole_mutex);
+	dynamic_netconsole_mutex_lock();
 	curr = !!(nt->sysdata_fields & SYSDATA_MSGID);
 	if (msgid_enabled == curr)
 		goto unlock_ok;
@@ -1038,7 +1057,7 @@ static ssize_t sysdata_msgid_enabled_store(struct config_item *item,
 
 unlock_ok:
 	ret = strnlen(buf, count);
-	mutex_unlock(&dynamic_netconsole_mutex);
+	dynamic_netconsole_mutex_unlock();
 	mutex_unlock(&netconsole_subsys.su_mutex);
 	return ret;
 }
@@ -1055,7 +1074,7 @@ static ssize_t sysdata_release_enabled_store(struct config_item *item,
 		return ret;
 
 	mutex_lock(&netconsole_subsys.su_mutex);
-	mutex_lock(&dynamic_netconsole_mutex);
+	dynamic_netconsole_mutex_lock();
 	curr = !!(nt->sysdata_fields & SYSDATA_RELEASE);
 	if (release_enabled == curr)
 		goto unlock_ok;
@@ -1067,7 +1086,7 @@ static ssize_t sysdata_release_enabled_store(struct config_item *item,
 
 unlock_ok:
 	ret = strnlen(buf, count);
-	mutex_unlock(&dynamic_netconsole_mutex);
+	dynamic_netconsole_mutex_unlock();
 	mutex_unlock(&netconsole_subsys.su_mutex);
 	return ret;
 }
@@ -1084,7 +1103,7 @@ static ssize_t sysdata_taskname_enabled_store(struct config_item *item,
 		return ret;
 
 	mutex_lock(&netconsole_subsys.su_mutex);
-	mutex_lock(&dynamic_netconsole_mutex);
+	dynamic_netconsole_mutex_lock();
 	curr = !!(nt->sysdata_fields & SYSDATA_TASKNAME);
 	if (taskname_enabled == curr)
 		goto unlock_ok;
@@ -1096,7 +1115,7 @@ static ssize_t sysdata_taskname_enabled_store(struct config_item *item,
 
 unlock_ok:
 	ret = strnlen(buf, count);
-	mutex_unlock(&dynamic_netconsole_mutex);
+	dynamic_netconsole_mutex_unlock();
 	mutex_unlock(&netconsole_subsys.su_mutex);
 	return ret;
 }
@@ -1114,7 +1133,7 @@ static ssize_t sysdata_cpu_nr_enabled_store(struct config_item *item,
 		return ret;
 
 	mutex_lock(&netconsole_subsys.su_mutex);
-	mutex_lock(&dynamic_netconsole_mutex);
+	dynamic_netconsole_mutex_lock();
 	curr = !!(nt->sysdata_fields & SYSDATA_CPU_NR);
 	if (cpu_nr_enabled == curr)
 		/* no change requested */
@@ -1130,7 +1149,7 @@ static ssize_t sysdata_cpu_nr_enabled_store(struct config_item *item,
 
 unlock_ok:
 	ret = strnlen(buf, count);
-	mutex_unlock(&dynamic_netconsole_mutex);
+	dynamic_netconsole_mutex_unlock();
 	mutex_unlock(&netconsole_subsys.su_mutex);
 	return ret;
 }
@@ -1192,10 +1211,10 @@ static void userdatum_drop(struct config_group *group, struct config_item *item)
 	ud = to_userdata(&group->cg_item);
 	nt = userdata_to_target(ud);
 
-	mutex_lock(&dynamic_netconsole_mutex);
+	dynamic_netconsole_mutex_lock();
 	update_userdata(nt);
 	config_item_put(item);
-	mutex_unlock(&dynamic_netconsole_mutex);
+	dynamic_netconsole_mutex_unlock();
 }
 
 static struct configfs_attribute *userdata_attrs[] = {