diff options
| -rw-r--r-- | drivers/net/netconsole.c | 39 |
1 files changed, 37 insertions, 2 deletions
diff --git a/drivers/net/netconsole.c b/drivers/net/netconsole.c index 01baa45221b4..21077aff061c 100644 --- a/drivers/net/netconsole.c +++ b/drivers/net/netconsole.c @@ -460,6 +460,33 @@ static ssize_t sysdata_release_enabled_show(struct config_item *item, return sysfs_emit(buf, "%d\n", release_enabled); } +/* Iterate in the list of target, and make sure we don't have any console + * register without targets of the same type + */ +static void unregister_netcons_consoles(void) +{ + struct netconsole_target *nt; + u32 console_type_needed = 0; + unsigned long flags; + + spin_lock_irqsave(&target_list_lock, flags); + list_for_each_entry(nt, &target_list, list) { + if (nt->extended) + console_type_needed |= CONS_EXTENDED; + else + console_type_needed |= CONS_BASIC; + } + spin_unlock_irqrestore(&target_list_lock, flags); + + if (!(console_type_needed & CONS_EXTENDED) && + console_is_registered(&netconsole_ext)) + unregister_console(&netconsole_ext); + + if (!(console_type_needed & CONS_BASIC) && + console_is_registered(&netconsole)) + unregister_console(&netconsole); +} + /* * This one is special -- targets created through the configfs interface * are not enabled (and the corresponding netpoll activated) by default. @@ -493,14 +520,18 @@ static ssize_t enabled_store(struct config_item *item, goto out_unlock; } - if (nt->extended && !console_is_registered(&netconsole_ext)) + if (nt->extended && !console_is_registered(&netconsole_ext)) { + netconsole_ext.flags |= CON_ENABLED; register_console(&netconsole_ext); + } /* User might be enabling the basic format target for the very * first time, make sure the console is registered. */ - if (!nt->extended && !console_is_registered(&netconsole)) + if (!nt->extended && !console_is_registered(&netconsole)) { + netconsole.flags |= CON_ENABLED; register_console(&netconsole); + } /* * Skip netpoll_parse_options() -- all the attributes are @@ -528,6 +559,10 @@ static ssize_t enabled_store(struct config_item *item, list_move(&nt->list, &target_cleanup_list); spin_unlock_irqrestore(&target_list_lock, flags); mutex_unlock(&target_cleanup_list_lock); + /* Unregister consoles, whose the last target of that type got + * disabled. + */ + unregister_netcons_consoles(); } ret = strnlen(buf, count); |