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path: root/drivers/net/netconsole.c
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Diffstat (limited to 'drivers/net/netconsole.c')
-rw-r--r--drivers/net/netconsole.c83
1 files changed, 46 insertions, 37 deletions
diff --git a/drivers/net/netconsole.c b/drivers/net/netconsole.c
index 59ac143dec2..ba2f5e710af 100644
--- a/drivers/net/netconsole.c
+++ b/drivers/net/netconsole.c
@@ -34,12 +34,15 @@
*
****************************************************************/
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
#include <linux/mm.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/console.h>
#include <linux/moduleparam.h>
+#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/netpoll.h>
#include <linux/inet.h>
@@ -101,6 +104,7 @@ struct netconsole_target {
struct config_item item;
#endif
int enabled;
+ struct mutex mutex;
struct netpoll np;
};
@@ -180,6 +184,7 @@ static struct netconsole_target *alloc_param_target(char *target_config)
strlcpy(nt->np.dev_name, "eth0", IFNAMSIZ);
nt->np.local_port = 6665;
nt->np.remote_port = 6666;
+ mutex_init(&nt->mutex);
memset(nt->np.remote_mac, 0xff, ETH_ALEN);
/* Parse parameters and setup netpoll */
@@ -307,6 +312,7 @@ static ssize_t store_enabled(struct netconsole_target *nt,
const char *buf,
size_t count)
{
+ unsigned long flags;
int enabled;
int err;
@@ -316,13 +322,12 @@ static ssize_t store_enabled(struct netconsole_target *nt,
if (enabled < 0 || enabled > 1)
return -EINVAL;
if (enabled == nt->enabled) {
- printk(KERN_INFO "netconsole: network logging has already %s\n",
- nt->enabled ? "started" : "stopped");
+ pr_info("network logging has already %s\n",
+ nt->enabled ? "started" : "stopped");
return -EINVAL;
}
if (enabled) { /* 1 */
-
/*
* Skip netpoll_parse_options() -- all the attributes are
* already configured via configfs. Just print them out.
@@ -333,9 +338,15 @@ static ssize_t store_enabled(struct netconsole_target *nt,
if (err)
return err;
- printk(KERN_INFO "netconsole: network logging started\n");
-
+ pr_info("netconsole: network logging started\n");
} else { /* 0 */
+ /* We need to disable the netconsole before cleaning it up
+ * otherwise we might end up in write_msg() with
+ * nt->np.dev == NULL and nt->enabled == 1
+ */
+ spin_lock_irqsave(&target_list_lock, flags);
+ nt->enabled = 0;
+ spin_unlock_irqrestore(&target_list_lock, flags);
netpoll_cleanup(&nt->np);
}
@@ -351,9 +362,8 @@ static ssize_t store_dev_name(struct netconsole_target *nt,
size_t len;
if (nt->enabled) {
- printk(KERN_ERR "netconsole: target (%s) is enabled, "
- "disable to update parameters\n",
- config_item_name(&nt->item));
+ pr_err("target (%s) is enabled, disable to update parameters\n",
+ config_item_name(&nt->item));
return -EINVAL;
}
@@ -374,9 +384,8 @@ static ssize_t store_local_port(struct netconsole_target *nt,
int rv;
if (nt->enabled) {
- printk(KERN_ERR "netconsole: target (%s) is enabled, "
- "disable to update parameters\n",
- config_item_name(&nt->item));
+ pr_err("target (%s) is enabled, disable to update parameters\n",
+ config_item_name(&nt->item));
return -EINVAL;
}
@@ -393,9 +402,8 @@ static ssize_t store_remote_port(struct netconsole_target *nt,
int rv;
if (nt->enabled) {
- printk(KERN_ERR "netconsole: target (%s) is enabled, "
- "disable to update parameters\n",
- config_item_name(&nt->item));
+ pr_err("target (%s) is enabled, disable to update parameters\n",
+ config_item_name(&nt->item));
return -EINVAL;
}
@@ -410,9 +418,8 @@ static ssize_t store_local_ip(struct netconsole_target *nt,
size_t count)
{
if (nt->enabled) {
- printk(KERN_ERR "netconsole: target (%s) is enabled, "
- "disable to update parameters\n",
- config_item_name(&nt->item));
+ pr_err("target (%s) is enabled, disable to update parameters\n",
+ config_item_name(&nt->item));
return -EINVAL;
}
@@ -420,7 +427,7 @@ static ssize_t store_local_ip(struct netconsole_target *nt,
const char *end;
if (in6_pton(buf, count, nt->np.local_ip.in6.s6_addr, -1, &end) > 0) {
if (*end && *end != '\n') {
- printk(KERN_ERR "netconsole: invalid IPv6 address at: <%c>\n", *end);
+ pr_err("invalid IPv6 address at: <%c>\n", *end);
return -EINVAL;
}
nt->np.ipv6 = true;
@@ -441,9 +448,8 @@ static ssize_t store_remote_ip(struct netconsole_target *nt,
size_t count)
{
if (nt->enabled) {
- printk(KERN_ERR "netconsole: target (%s) is enabled, "
- "disable to update parameters\n",
- config_item_name(&nt->item));
+ pr_err("target (%s) is enabled, disable to update parameters\n",
+ config_item_name(&nt->item));
return -EINVAL;
}
@@ -451,7 +457,7 @@ static ssize_t store_remote_ip(struct netconsole_target *nt,
const char *end;
if (in6_pton(buf, count, nt->np.remote_ip.in6.s6_addr, -1, &end) > 0) {
if (*end && *end != '\n') {
- printk(KERN_ERR "netconsole: invalid IPv6 address at: <%c>\n", *end);
+ pr_err("invalid IPv6 address at: <%c>\n", *end);
return -EINVAL;
}
nt->np.ipv6 = true;
@@ -474,9 +480,8 @@ static ssize_t store_remote_mac(struct netconsole_target *nt,
u8 remote_mac[ETH_ALEN];
if (nt->enabled) {
- printk(KERN_ERR "netconsole: target (%s) is enabled, "
- "disable to update parameters\n",
- config_item_name(&nt->item));
+ pr_err("target (%s) is enabled, disable to update parameters\n",
+ config_item_name(&nt->item));
return -EINVAL;
}
@@ -556,8 +561,10 @@ static ssize_t netconsole_target_attr_store(struct config_item *item,
struct netconsole_target_attr *na =
container_of(attr, struct netconsole_target_attr, attr);
+ mutex_lock(&nt->mutex);
if (na->store)
ret = na->store(nt, buf, count);
+ mutex_unlock(&nt->mutex);
return ret;
}
@@ -596,6 +603,7 @@ static struct config_item *make_netconsole_target(struct config_group *group,
strlcpy(nt->np.dev_name, "eth0", IFNAMSIZ);
nt->np.local_port = 6665;
nt->np.remote_port = 6666;
+ mutex_init(&nt->mutex);
memset(nt->np.remote_mac, 0xff, ETH_ALEN);
/* Initialize the config_item member */
@@ -653,12 +661,11 @@ static struct configfs_subsystem netconsole_subsys = {
/* Handle network interface device notifications */
static int netconsole_netdev_event(struct notifier_block *this,
- unsigned long event,
- void *ptr)
+ unsigned long event, void *ptr)
{
unsigned long flags;
struct netconsole_target *nt;
- struct net_device *dev = ptr;
+ struct net_device *dev = netdev_notifier_info_to_dev(ptr);
bool stopped = false;
if (!(event == NETDEV_CHANGENAME || event == NETDEV_UNREGISTER ||
@@ -677,12 +684,13 @@ restart:
case NETDEV_RELEASE:
case NETDEV_JOIN:
case NETDEV_UNREGISTER:
- /*
- * rtnl_lock already held
+ /* rtnl_lock already held
* we might sleep in __netpoll_cleanup()
*/
spin_unlock_irqrestore(&target_list_lock, flags);
+
__netpoll_cleanup(&nt->np);
+
spin_lock_irqsave(&target_list_lock, flags);
dev_put(nt->np.dev);
nt->np.dev = NULL;
@@ -696,19 +704,20 @@ restart:
}
spin_unlock_irqrestore(&target_list_lock, flags);
if (stopped) {
- printk(KERN_INFO "netconsole: network logging stopped on "
- "interface %s as it ", dev->name);
+ const char *msg = "had an event";
switch (event) {
case NETDEV_UNREGISTER:
- printk(KERN_CONT "unregistered\n");
+ msg = "unregistered";
break;
case NETDEV_RELEASE:
- printk(KERN_CONT "released slaves\n");
+ msg = "released slaves";
break;
case NETDEV_JOIN:
- printk(KERN_CONT "is joining a master device\n");
+ msg = "is joining a master device";
break;
}
+ pr_info("network logging stopped on interface %s as it %s\n",
+ dev->name, msg);
}
done:
@@ -794,7 +803,7 @@ static int __init init_netconsole(void)
goto undonotifier;
register_console(&netconsole);
- printk(KERN_INFO "netconsole: network logging started\n");
+ pr_info("network logging started\n");
return err;
@@ -802,7 +811,7 @@ undonotifier:
unregister_netdevice_notifier(&netconsole_netdev_notifier);
fail:
- printk(KERN_ERR "netconsole: cleaning up\n");
+ pr_err("cleaning up\n");
/*
* Remove all targets and destroy them (only targets created
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-09 16:11:17 +0000