The following commit has been merged in the linux branch: commit 837b8248f6206a6b08b3d6defe2946282e432679 Author: Linus Luessing linus.luessing@web.de Date: Fri Feb 19 16:18:08 2010 +0100

Staging: batman-adv: atomic variable for vis-srv activation

This fixes the bug discovered by Marek Lindner which did not allow turning on the vis-server before an interface has been added. With this patch we are using a global atomic variable for activating and deactiating the vis-server-mode, which can be used before inserting an interface.

Signed-off-by: Linus Luessing linus.luessing@web.de Signed-off-by: Andrew Lunn andrew@lunn.ch Signed-off-by: Greg Kroah-Hartman gregkh@suse.de

diff --git a/drivers/staging/batman-adv/main.c b/drivers/staging/batman-adv/main.c index 3f78075..2e0b482 100644 --- a/drivers/staging/batman-adv/main.c +++ b/drivers/staging/batman-adv/main.c @@ -43,6 +43,7 @@ DEFINE_SPINLOCK(forw_bcast_list_lock);

atomic_t originator_interval; atomic_t vis_interval; +atomic_t vis_mode; atomic_t aggregation_enabled; int16_t num_hna; int16_t num_ifs; @@ -83,6 +84,7 @@ int init_module(void) atomic_set(&originator_interval, 1000); atomic_set(&vis_interval, 1000);/* TODO: raise this later, this is only * for debugging now. */ + atomic_set(&vis_mode, VIS_TYPE_CLIENT_UPDATE); atomic_set(&aggregation_enabled, 1);

/* the name should not be longer than 10 chars - see diff --git a/drivers/staging/batman-adv/main.h b/drivers/staging/batman-adv/main.h index eb6a702..deb41f5 100644 --- a/drivers/staging/batman-adv/main.h +++ b/drivers/staging/batman-adv/main.h @@ -130,6 +130,7 @@ extern spinlock_t forw_bcast_list_lock;

extern atomic_t originator_interval; extern atomic_t vis_interval; +extern atomic_t vis_mode; extern atomic_t aggregation_enabled; extern int16_t num_hna; extern int16_t num_ifs; diff --git a/drivers/staging/batman-adv/proc.c b/drivers/staging/batman-adv/proc.c index 68c36b0..0eadc6b 100644 --- a/drivers/staging/batman-adv/proc.c +++ b/drivers/staging/batman-adv/proc.c @@ -338,11 +338,11 @@ static ssize_t proc_vis_srv_write(struct file *file, const char __user * buffer, if ((strcmp(vis_mode_string, "client") == 0) || (strcmp(vis_mode_string, "disabled") == 0)) { printk(KERN_INFO "batman-adv:Setting VIS mode to client (disabling vis server)\n"); - vis_set_mode(VIS_TYPE_CLIENT_UPDATE); + atomic_set(&vis_mode, VIS_TYPE_CLIENT_UPDATE); } else if ((strcmp(vis_mode_string, "server") == 0) || (strcmp(vis_mode_string, "enabled") == 0)) { printk(KERN_INFO "batman-adv:Setting VIS mode to server (enabling vis server)\n"); - vis_set_mode(VIS_TYPE_SERVER_SYNC); + atomic_set(&vis_mode, VIS_TYPE_SERVER_SYNC); } else printk(KERN_ERR "batman-adv:Unknown VIS mode: %s\n", vis_mode_string); @@ -353,12 +353,12 @@ static ssize_t proc_vis_srv_write(struct file *file, const char __user * buffer,

static int proc_vis_srv_read(struct seq_file *seq, void *offset) { - int vis_server = is_vis_server(); + int vis_server = atomic_read(&vis_mode);

seq_printf(seq, "[%c] client mode (server disabled) \n", - (!vis_server) ? 'x' : ' '); + (vis_server == VIS_TYPE_CLIENT_UPDATE) ? 'x' : ' '); seq_printf(seq, "[%c] server mode (server enabled) \n", - (vis_server) ? 'x' : ' '); + (vis_server == VIS_TYPE_SERVER_SYNC) ? 'x' : ' ');

return 0; } @@ -377,9 +377,10 @@ static int proc_vis_data_read(struct seq_file *seq, void *offset) int i; char tmp_addr_str[ETH_STR_LEN]; unsigned long flags; + int vis_server = atomic_read(&vis_mode);

rcu_read_lock(); - if (list_empty(&if_list) || (!is_vis_server())) { + if (list_empty(&if_list) || (vis_server == VIS_TYPE_CLIENT_UPDATE)) { rcu_read_unlock(); goto end; } @@ -672,5 +673,3 @@ int setup_procfs(void)

return 0; } - - diff --git a/drivers/staging/batman-adv/send.c b/drivers/staging/batman-adv/send.c index 944b2cd..2a9fac8 100644 --- a/drivers/staging/batman-adv/send.c +++ b/drivers/staging/batman-adv/send.c @@ -248,6 +248,7 @@ void schedule_own_packet(struct batman_if *batman_if) { unsigned long send_time; struct batman_packet *batman_packet; + int vis_server = atomic_read(&vis_mode);

/** * the interface gets activated here to avoid race conditions between @@ -272,7 +273,7 @@ void schedule_own_packet(struct batman_if *batman_if) /* change sequence number to network order */ batman_packet->seqno = htons((uint16_t)atomic_read(&batman_if->seqno));

- if (is_vis_server()) + if (vis_server == VIS_TYPE_SERVER_SYNC) batman_packet->flags = VIS_SERVER; else batman_packet->flags = 0; diff --git a/drivers/staging/batman-adv/vis.c b/drivers/staging/batman-adv/vis.c index ec8bb3f..fedec1b 100644 --- a/drivers/staging/batman-adv/vis.c +++ b/drivers/staging/batman-adv/vis.c @@ -48,41 +48,6 @@ static void free_info(void *data) kfree(info); }

-/* set the mode of the visualization to client or server */ -void vis_set_mode(int mode) -{ - unsigned long flags; - spin_lock_irqsave(&vis_hash_lock, flags); - - if (my_vis_info != NULL) - my_vis_info->packet.vis_type = mode; - - spin_unlock_irqrestore(&vis_hash_lock, flags); -} - -/* is_vis_server(), locked outside */ -static int is_vis_server_locked(void) -{ - if (my_vis_info != NULL) - if (my_vis_info->packet.vis_type == VIS_TYPE_SERVER_SYNC) - return 1; - - return 0; -} - -/* get the current set mode */ -int is_vis_server(void) -{ - int ret = 0; - unsigned long flags; - - spin_lock_irqsave(&vis_hash_lock, flags); - ret = is_vis_server_locked(); - spin_unlock_irqrestore(&vis_hash_lock, flags); - - return ret; -} - /* Compare two vis packets, used by the hashing algorithm */ static int vis_info_cmp(void *data1, void *data2) { @@ -271,6 +236,7 @@ void receive_server_sync_packet(struct vis_packet *vis_packet, int vis_info_len) struct vis_info *info; int is_new; unsigned long flags; + int vis_server = atomic_read(&vis_mode);

spin_lock_irqsave(&vis_hash_lock, flags); info = add_packet(vis_packet, vis_info_len, &is_new); @@ -279,7 +245,7 @@ void receive_server_sync_packet(struct vis_packet *vis_packet, int vis_info_len)

/* only if we are server ourselves and packet is newer than the one in * hash.*/ - if (is_vis_server_locked() && is_new) { + if (vis_server == VIS_TYPE_SERVER_SYNC && is_new) { memcpy(info->packet.target_orig, broadcastAddr, ETH_ALEN); if (list_empty(&info->send_list)) list_add_tail(&info->send_list, &send_list); @@ -295,6 +261,7 @@ void receive_client_update_packet(struct vis_packet *vis_packet, struct vis_info *info; int is_new; unsigned long flags; + int vis_server = atomic_read(&vis_mode);

/* clients shall not broadcast. */ if (is_bcast(vis_packet->target_orig)) @@ -308,7 +275,7 @@ void receive_client_update_packet(struct vis_packet *vis_packet,

/* send only if we're the target server or ... */ - if (is_vis_server_locked() && + if (vis_server == VIS_TYPE_SERVER_SYNC && is_my_mac(info->packet.target_orig) && is_new) { info->packet.vis_type = VIS_TYPE_SERVER_SYNC; /* upgrade! */ @@ -372,6 +339,7 @@ static int generate_vis_packet(void) unsigned long flags;

info->first_seen = jiffies; + info->packet.vis_type = atomic_read(&vis_mode);

spin_lock_irqsave(&orig_hash_lock, flags); memcpy(info->packet.target_orig, broadcastAddr, ETH_ALEN); @@ -379,7 +347,7 @@ static int generate_vis_packet(void) info->packet.seqno++; info->packet.entries = 0;

- if (!is_vis_server_locked()) { + if (info->packet.vis_type == VIS_TYPE_CLIENT_UPDATE) { best_tq = find_best_vis_server(info); if (best_tq < 0) { spin_unlock_irqrestore(&orig_hash_lock, flags); @@ -577,7 +545,6 @@ int vis_init(void) INIT_LIST_HEAD(&my_vis_info->send_list); my_vis_info->packet.version = COMPAT_VERSION; my_vis_info->packet.packet_type = BAT_VIS; - my_vis_info->packet.vis_type = VIS_TYPE_CLIENT_UPDATE; my_vis_info->packet.ttl = TTL; my_vis_info->packet.seqno = 0; my_vis_info->packet.entries = 0; @@ -628,4 +595,3 @@ static void start_vis_timer(void) queue_delayed_work(bat_event_workqueue, &vis_timer_wq, (atomic_read(&vis_interval) * HZ) / 1000); } - diff --git a/drivers/staging/batman-adv/vis.h b/drivers/staging/batman-adv/vis.h index 2e24258..0cdafde 100644 --- a/drivers/staging/batman-adv/vis.h +++ b/drivers/staging/batman-adv/vis.h @@ -48,8 +48,6 @@ struct recvlist_node { extern struct hashtable_t *vis_hash; extern spinlock_t vis_hash_lock;

-void vis_set_mode(int mode); -int is_vis_server(void); void proc_vis_read_entry(struct seq_file *seq, struct vis_info_entry *entry, struct hlist_head *if_list,