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authorCorey Minyard <cminyard@mvista.com>2014-11-07 02:01:59 +0300
committerCorey Minyard <cminyard@mvista.com>2014-12-12 00:04:10 +0300
commitb874b985c816c74a9bda04082f18db88dcbc808a (patch)
tree001d8b47ac8e7fbd39573db365d254ece6aa4cad
parent7ea0ed2b5be81781ba976bc03414ef5da76270b9 (diff)
downloadlinux-b874b985c816c74a9bda04082f18db88dcbc808a.tar.xz
ipmi: Remove the now unnecessary message queue
A message queue was added to the message handler, so the SMI interfaces only need to handle one message at a time. Pull out the message queue. This also leads to some significant simplification in the shutdown of an interface, since the message handler now does a lot of the cleanup. Signed-off-by: Corey Minyard <cminyard@mvista.com>
-rw-r--r--drivers/char/ipmi/ipmi_si_intf.c112
1 files changed, 34 insertions, 78 deletions
diff --git a/drivers/char/ipmi/ipmi_si_intf.c b/drivers/char/ipmi/ipmi_si_intf.c
index e36487db0e94..d31a7fce2260 100644
--- a/drivers/char/ipmi/ipmi_si_intf.c
+++ b/drivers/char/ipmi/ipmi_si_intf.c
@@ -170,8 +170,7 @@ struct smi_info {
struct si_sm_handlers *handlers;
enum si_type si_type;
spinlock_t si_lock;
- struct list_head xmit_msgs;
- struct list_head hp_xmit_msgs;
+ struct ipmi_smi_msg *waiting_msg;
struct ipmi_smi_msg *curr_msg;
enum si_intf_state si_state;
@@ -250,9 +249,6 @@ struct smi_info {
/* The time (in jiffies) the last timeout occurred at. */
unsigned long last_timeout_jiffies;
- /* Used to gracefully stop the timer without race conditions. */
- atomic_t stop_operation;
-
/* Are we waiting for the events, pretimeouts, received msgs? */
atomic_t need_watch;
@@ -355,28 +351,18 @@ static void return_hosed_msg(struct smi_info *smi_info, int cCode)
static enum si_sm_result start_next_msg(struct smi_info *smi_info)
{
int rv;
- struct list_head *entry = NULL;
#ifdef DEBUG_TIMING
struct timeval t;
#endif
- /* Pick the high priority queue first. */
- if (!list_empty(&(smi_info->hp_xmit_msgs))) {
- entry = smi_info->hp_xmit_msgs.next;
- } else if (!list_empty(&(smi_info->xmit_msgs))) {
- entry = smi_info->xmit_msgs.next;
- }
-
- if (!entry) {
+ if (!smi_info->waiting_msg) {
smi_info->curr_msg = NULL;
rv = SI_SM_IDLE;
} else {
int err;
- list_del(entry);
- smi_info->curr_msg = list_entry(entry,
- struct ipmi_smi_msg,
- link);
+ smi_info->curr_msg = smi_info->waiting_msg;
+ smi_info->waiting_msg = NULL;
#ifdef DEBUG_TIMING
do_gettimeofday(&t);
printk(KERN_DEBUG "**Start2: %d.%9.9d\n", t.tv_sec, t.tv_usec);
@@ -916,14 +902,8 @@ static void sender(void *send_info,
struct timeval t;
#endif
- if (atomic_read(&smi_info->stop_operation)) {
- msg->rsp[0] = msg->data[0] | 4;
- msg->rsp[1] = msg->data[1];
- msg->rsp[2] = IPMI_ERR_UNSPECIFIED;
- msg->rsp_size = 3;
- deliver_recv_msg(smi_info, msg);
- return;
- }
+ BUG_ON(smi_info->waiting_msg);
+ smi_info->waiting_msg = msg;
#ifdef DEBUG_TIMING
do_gettimeofday(&t);
@@ -932,16 +912,16 @@ static void sender(void *send_info,
if (smi_info->run_to_completion) {
/*
- * If we are running to completion, then throw it in
- * the list and run transactions until everything is
- * clear. Priority doesn't matter here.
+ * If we are running to completion, start it and run
+ * transactions until everything is clear.
*/
+ smi_info->curr_msg = smi_info->waiting_msg;
+ smi_info->waiting_msg = NULL;
/*
* Run to completion means we are single-threaded, no
* need for locks.
*/
- list_add_tail(&(msg->link), &(smi_info->xmit_msgs));
result = smi_event_handler(smi_info, 0);
while (result != SI_SM_IDLE) {
@@ -953,11 +933,6 @@ static void sender(void *send_info,
}
spin_lock_irqsave(&smi_info->si_lock, flags);
- if (priority > 0)
- list_add_tail(&msg->link, &smi_info->hp_xmit_msgs);
- else
- list_add_tail(&msg->link, &smi_info->xmit_msgs);
-
check_start_timer_thread(smi_info);
spin_unlock_irqrestore(&smi_info->si_lock, flags);
}
@@ -1095,8 +1070,7 @@ static void request_events(void *send_info)
{
struct smi_info *smi_info = send_info;
- if (atomic_read(&smi_info->stop_operation) ||
- !smi_info->has_event_buffer)
+ if (!smi_info->has_event_buffer)
return;
atomic_set(&smi_info->req_events, 1);
@@ -3220,15 +3194,10 @@ static void setup_xaction_handlers(struct smi_info *smi_info)
static inline void wait_for_timer_and_thread(struct smi_info *smi_info)
{
- if (smi_info->intf) {
- /*
- * The timer and thread are only running if the
- * interface has been started up and registered.
- */
- if (smi_info->thread != NULL)
- kthread_stop(smi_info->thread);
+ if (smi_info->thread != NULL)
+ kthread_stop(smi_info->thread);
+ if (smi_info->timer_running)
del_timer_sync(&smi_info->si_timer);
- }
}
static struct ipmi_default_vals
@@ -3403,8 +3372,7 @@ static int try_smi_init(struct smi_info *new_smi)
setup_oem_data_handler(new_smi);
setup_xaction_handlers(new_smi);
- INIT_LIST_HEAD(&(new_smi->xmit_msgs));
- INIT_LIST_HEAD(&(new_smi->hp_xmit_msgs));
+ new_smi->waiting_msg = NULL;
new_smi->curr_msg = NULL;
atomic_set(&new_smi->req_events, 0);
new_smi->run_to_completion = false;
@@ -3412,7 +3380,6 @@ static int try_smi_init(struct smi_info *new_smi)
atomic_set(&new_smi->stats[i], 0);
new_smi->interrupt_disabled = true;
- atomic_set(&new_smi->stop_operation, 0);
atomic_set(&new_smi->need_watch, 0);
new_smi->intf_num = smi_num;
smi_num++;
@@ -3497,15 +3464,15 @@ static int try_smi_init(struct smi_info *new_smi)
return 0;
out_err_stop_timer:
- atomic_inc(&new_smi->stop_operation);
wait_for_timer_and_thread(new_smi);
out_err:
new_smi->interrupt_disabled = true;
if (new_smi->intf) {
- ipmi_unregister_smi(new_smi->intf);
+ ipmi_smi_t intf = new_smi->intf;
new_smi->intf = NULL;
+ ipmi_unregister_smi(intf);
}
if (new_smi->irq_cleanup) {
@@ -3684,60 +3651,49 @@ module_init(init_ipmi_si);
static void cleanup_one_si(struct smi_info *to_clean)
{
int rv = 0;
- unsigned long flags;
if (!to_clean)
return;
+ if (to_clean->intf) {
+ ipmi_smi_t intf = to_clean->intf;
+
+ to_clean->intf = NULL;
+ rv = ipmi_unregister_smi(intf);
+ if (rv) {
+ pr_err(PFX "Unable to unregister device: errno=%d\n",
+ rv);
+ }
+ }
+
if (to_clean->dev)
dev_set_drvdata(to_clean->dev, NULL);
list_del(&to_clean->link);
- /* Tell the driver that we are shutting down. */
- atomic_inc(&to_clean->stop_operation);
-
/*
- * Make sure the timer and thread are stopped and will not run
- * again.
+ * Make sure that interrupts, the timer and the thread are
+ * stopped and will not run again.
*/
+ if (to_clean->irq_cleanup)
+ to_clean->irq_cleanup(to_clean);
wait_for_timer_and_thread(to_clean);
/*
* Timeouts are stopped, now make sure the interrupts are off
- * for the device. A little tricky with locks to make sure
- * there are no races.
+ * in the BMC. Note that timers and CPU interrupts are off,
+ * so no need for locks.
*/
- spin_lock_irqsave(&to_clean->si_lock, flags);
while (to_clean->curr_msg || (to_clean->si_state != SI_NORMAL)) {
- spin_unlock_irqrestore(&to_clean->si_lock, flags);
poll(to_clean);
schedule_timeout_uninterruptible(1);
- spin_lock_irqsave(&to_clean->si_lock, flags);
}
disable_si_irq(to_clean);
- spin_unlock_irqrestore(&to_clean->si_lock, flags);
- while (to_clean->curr_msg || (to_clean->si_state != SI_NORMAL)) {
- poll(to_clean);
- schedule_timeout_uninterruptible(1);
- }
-
- /* Clean up interrupts and make sure that everything is done. */
- if (to_clean->irq_cleanup)
- to_clean->irq_cleanup(to_clean);
while (to_clean->curr_msg || (to_clean->si_state != SI_NORMAL)) {
poll(to_clean);
schedule_timeout_uninterruptible(1);
}
- if (to_clean->intf)
- rv = ipmi_unregister_smi(to_clean->intf);
-
- if (rv) {
- printk(KERN_ERR PFX "Unable to unregister device: errno=%d\n",
- rv);
- }
-
if (to_clean->handlers)
to_clean->handlers->cleanup(to_clean->si_sm);