static void smi_recv_tasklet(unsigned long);
static void handle_new_recv_msgs(ipmi_smi_t intf);
static void need_waiter(ipmi_smi_t intf);
+static int handle_one_recv_msg(ipmi_smi_t intf,
+ struct ipmi_smi_msg *msg);
static int initialized;
struct kref refcount;
+ /* Set when the interface is being unregistered. */
+ bool in_shutdown;
+
/* Used for a list of interfaces. */
struct list_head link;
atomic_t watchdog_pretimeouts_to_deliver;
struct tasklet_struct recv_tasklet;
+ spinlock_t xmit_msgs_lock;
+ struct list_head xmit_msgs;
+ struct ipmi_smi_msg *curr_msg;
+ struct list_head hp_xmit_msgs;
+
/*
* The list of command receivers that are registered for commands
* on this interface.
static void smi_send(ipmi_smi_t intf, struct ipmi_smi_handlers *handlers,
struct ipmi_smi_msg *smi_msg, int priority)
{
- handlers->sender(intf->send_info, smi_msg, 0);
+ int run_to_completion = intf->run_to_completion;
+ unsigned long flags;
+
+ if (!run_to_completion)
+ spin_lock_irqsave(&intf->xmit_msgs_lock, flags);
+ if (intf->curr_msg) {
+ if (priority > 0)
+ list_add_tail(&smi_msg->link, &intf->hp_xmit_msgs);
+ else
+ list_add_tail(&smi_msg->link, &intf->xmit_msgs);
+ smi_msg = NULL;
+ } else {
+ intf->curr_msg = smi_msg;
+ }
+ if (!run_to_completion)
+ spin_unlock_irqrestore(&intf->xmit_msgs_lock, flags);
+
+ if (smi_msg)
+ handlers->sender(intf->send_info, smi_msg, 0);
}
/*
struct ipmi_smi_msg *smi_msg;
struct ipmi_recv_msg *recv_msg;
unsigned long flags;
- struct ipmi_smi_handlers *handlers;
if (supplied_recv)
}
rcu_read_lock();
- handlers = intf->handlers;
- if (!handlers) {
+ if (intf->in_shutdown) {
rv = -ENODEV;
goto out_err;
}
}
#endif
- smi_send(intf, handlers, smi_msg, priority);
+ smi_send(intf, intf->handlers, smi_msg, priority);
rcu_read_unlock();
return 0;
smi_recv_tasklet,
(unsigned long) intf);
atomic_set(&intf->watchdog_pretimeouts_to_deliver, 0);
+ spin_lock_init(&intf->xmit_msgs_lock);
+ INIT_LIST_HEAD(&intf->xmit_msgs);
+ INIT_LIST_HEAD(&intf->hp_xmit_msgs);
spin_lock_init(&intf->events_lock);
atomic_set(&intf->event_waiters, 0);
intf->ticks_to_req_ev = IPMI_REQUEST_EV_TIME;
}
EXPORT_SYMBOL(ipmi_register_smi);
+static void deliver_smi_err_response(ipmi_smi_t intf,
+ struct ipmi_smi_msg *msg,
+ unsigned char err)
+{
+ msg->rsp[0] = msg->data[0] | 4;
+ msg->rsp[1] = msg->data[1];
+ msg->rsp[2] = err;
+ msg->rsp_size = 3;
+ /* It's an error, so it will never requeue, no need to check return. */
+ handle_one_recv_msg(intf, msg);
+}
+
static void cleanup_smi_msgs(ipmi_smi_t intf)
{
int i;
struct seq_table *ent;
+ struct ipmi_smi_msg *msg;
+ struct list_head *entry;
+ struct list_head tmplist;
+
+ /* Clear out our transmit queues and hold the messages. */
+ INIT_LIST_HEAD(&tmplist);
+ list_splice_tail(&intf->hp_xmit_msgs, &tmplist);
+ list_splice_tail(&intf->xmit_msgs, &tmplist);
+
+ /* Current message first, to preserve order */
+ while (intf->curr_msg && !list_empty(&intf->waiting_rcv_msgs)) {
+ /* Wait for the message to clear out. */
+ schedule_timeout(1);
+ }
/* No need for locks, the interface is down. */
+
+ /*
+ * Return errors for all pending messages in queue and in the
+ * tables waiting for remote responses.
+ */
+ while (!list_empty(&tmplist)) {
+ entry = tmplist.next;
+ list_del(entry);
+ msg = list_entry(entry, struct ipmi_smi_msg, link);
+ deliver_smi_err_response(intf, msg, IPMI_ERR_UNSPECIFIED);
+ }
+
for (i = 0; i < IPMI_IPMB_NUM_SEQ; i++) {
ent = &(intf->seq_table[i]);
if (!ent->inuse)
int ipmi_unregister_smi(ipmi_smi_t intf)
{
struct ipmi_smi_watcher *w;
- int intf_num = intf->intf_num;
+ int intf_num = intf->intf_num;
+ ipmi_user_t user;
ipmi_bmc_unregister(intf);
mutex_lock(&smi_watchers_mutex);
mutex_lock(&ipmi_interfaces_mutex);
intf->intf_num = -1;
- intf->handlers = NULL;
+ intf->in_shutdown = true;
list_del_rcu(&intf->link);
mutex_unlock(&ipmi_interfaces_mutex);
synchronize_rcu();
cleanup_smi_msgs(intf);
+ /* Clean up the effects of users on the lower-level software. */
+ mutex_lock(&ipmi_interfaces_mutex);
+ rcu_read_lock();
+ list_for_each_entry_rcu(user, &intf->users, link) {
+ module_put(intf->handlers->owner);
+ if (intf->handlers->dec_usecount)
+ intf->handlers->dec_usecount(intf->send_info);
+ }
+ rcu_read_unlock();
+ intf->handlers = NULL;
+ mutex_unlock(&ipmi_interfaces_mutex);
+
remove_proc_entries(intf);
/*
ipmi_user_t user = NULL;
struct ipmi_ipmb_addr *ipmb_addr;
struct ipmi_recv_msg *recv_msg;
- struct ipmi_smi_handlers *handlers;
if (msg->rsp_size < 10) {
/* Message not big enough, just ignore it. */
}
#endif
rcu_read_lock();
- handlers = intf->handlers;
- if (handlers) {
- smi_send(intf, handlers, msg, 0);
+ if (!intf->in_shutdown) {
+ smi_send(intf, intf->handlers, msg, 0);
/*
* We used the message, so return the value
* that causes it to not be freed or
while (!list_empty(&intf->waiting_rcv_msgs)) {
smi_msg = list_entry(intf->waiting_rcv_msgs.next,
struct ipmi_smi_msg, link);
- list_del(&smi_msg->link);
if (!run_to_completion)
spin_unlock_irqrestore(&intf->waiting_rcv_msgs_lock,
flags);
rv = handle_one_recv_msg(intf, smi_msg);
if (!run_to_completion)
spin_lock_irqsave(&intf->waiting_rcv_msgs_lock, flags);
- if (rv == 0) {
- /* Message handled */
- ipmi_free_smi_msg(smi_msg);
- } else if (rv < 0) {
- /* Fatal error on the message, del but don't free. */
- } else {
+ if (rv > 0) {
/*
* To preserve message order, quit if we
* can't handle a message.
*/
- list_add(&smi_msg->link, &intf->waiting_rcv_msgs);
break;
+ } else {
+ list_del(&smi_msg->link);
+ if (rv == 0)
+ /* Message handled */
+ ipmi_free_smi_msg(smi_msg);
+ /* If rv < 0, fatal error, del but don't free. */
}
}
if (!run_to_completion)
static void smi_recv_tasklet(unsigned long val)
{
- handle_new_recv_msgs((ipmi_smi_t) val);
+ unsigned long flags = 0; /* keep us warning-free. */
+ ipmi_smi_t intf = (ipmi_smi_t) val;
+ int run_to_completion = intf->run_to_completion;
+ struct ipmi_smi_msg *newmsg = NULL;
+
+ /*
+ * Start the next message if available.
+ *
+ * Do this here, not in the actual receiver, because we may deadlock
+ * because the lower layer is allowed to hold locks while calling
+ * message delivery.
+ */
+ if (!run_to_completion)
+ spin_lock_irqsave(&intf->xmit_msgs_lock, flags);
+ if (intf->curr_msg == NULL && !intf->in_shutdown) {
+ struct list_head *entry = NULL;
+
+ /* Pick the high priority queue first. */
+ if (!list_empty(&intf->hp_xmit_msgs))
+ entry = intf->hp_xmit_msgs.next;
+ else if (!list_empty(&intf->xmit_msgs))
+ entry = intf->xmit_msgs.next;
+
+ if (entry) {
+ list_del(entry);
+ newmsg = list_entry(entry, struct ipmi_smi_msg, link);
+ intf->curr_msg = newmsg;
+ }
+ }
+ if (!run_to_completion)
+ spin_unlock_irqrestore(&intf->xmit_msgs_lock, flags);
+ if (newmsg)
+ intf->handlers->sender(intf->send_info, newmsg, 0);
+
+ handle_new_recv_msgs(intf);
}
/* Handle a new message from the lower layer. */
struct ipmi_smi_msg *msg)
{
unsigned long flags = 0; /* keep us warning-free. */
- int run_to_completion;
-
+ int run_to_completion = intf->run_to_completion;
if ((msg->data_size >= 2)
&& (msg->data[0] == (IPMI_NETFN_APP_REQUEST << 2))
&& (msg->data[1] == IPMI_SEND_MSG_CMD)
&& (msg->user_data == NULL)) {
+
+ if (intf->in_shutdown)
+ goto free_msg;
+
/*
* This is the local response to a command send, start
* the timer for these. The user_data will not be
/* The message was sent, start the timer. */
intf_start_seq_timer(intf, msg->msgid);
+free_msg:
ipmi_free_smi_msg(msg);
- goto out;
+ } else {
+ /*
+ * To preserve message order, we keep a queue and deliver from
+ * a tasklet.
+ */
+ if (!run_to_completion)
+ spin_lock_irqsave(&intf->waiting_rcv_msgs_lock, flags);
+ list_add_tail(&msg->link, &intf->waiting_rcv_msgs);
+ if (!run_to_completion)
+ spin_unlock_irqrestore(&intf->waiting_rcv_msgs_lock,
+ flags);
}
- /*
- * To preserve message order, if the list is not empty, we
- * tack this message onto the end of the list.
- */
- run_to_completion = intf->run_to_completion;
if (!run_to_completion)
- spin_lock_irqsave(&intf->waiting_rcv_msgs_lock, flags);
- list_add_tail(&msg->link, &intf->waiting_rcv_msgs);
+ spin_lock_irqsave(&intf->xmit_msgs_lock, flags);
+ if (msg == intf->curr_msg)
+ intf->curr_msg = NULL;
if (!run_to_completion)
- spin_unlock_irqrestore(&intf->waiting_rcv_msgs_lock, flags);
+ spin_unlock_irqrestore(&intf->xmit_msgs_lock, flags);
- tasklet_schedule(&intf->recv_tasklet);
- out:
- return;
+ if (run_to_completion)
+ smi_recv_tasklet((unsigned long) intf);
+ else
+ tasklet_schedule(&intf->recv_tasklet);
}
EXPORT_SYMBOL(ipmi_smi_msg_received);
void ipmi_smi_watchdog_pretimeout(ipmi_smi_t intf)
{
+ if (intf->in_shutdown)
+ return;
+
atomic_set(&intf->watchdog_pretimeouts_to_deliver, 1);
tasklet_schedule(&intf->recv_tasklet);
}
struct ipmi_recv_msg *msg;
struct ipmi_smi_handlers *handlers;
- if (intf->intf_num == -1)
+ if (intf->in_shutdown)
return;
if (!ent->inuse)
static void ipmi_request_event(ipmi_smi_t intf)
{
- struct ipmi_smi_handlers *handlers;
-
/* No event requests when in maintenance mode. */
if (intf->maintenance_mode_enable)
return;
- handlers = intf->handlers;
- if (handlers)
- handlers->request_events(intf->send_info);
+ if (!intf->in_shutdown)
+ intf->handlers->request_events(intf->send_info);
}
static struct timer_list ipmi_timer;
projects / linux-beck.git / commitdiff