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ipmi: simplify locking

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Now that the the IPMI driver is using a tasklet, we can simplify the
locking in the driver and get rid of the message lock.

Signed-off-by: Corey Minyard <cminyard@mvista.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Corey Minyard 2012-03-28 14:42:50 -07:00 committed by Linus Torvalds
parent 895dcfd1ca
commit f60adf42ad
1 changed files with 21 additions and 33 deletions
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54
drivers/char/ipmi/ipmi_si_intf.c
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@ -171,7 +171,6 @@ struct smi_info {
struct si_sm_handlers *handlers;
enum si_type si_type;
spinlock_t si_lock;
spinlock_t msg_lock;
struct list_head xmit_msgs;
struct list_head hp_xmit_msgs;
struct ipmi_smi_msg *curr_msg;
@ -350,13 +349,6 @@ static enum si_sm_result start_next_msg(struct smi_info *smi_info)
struct timeval t;
#endif
/*
* No need to save flags, we aleady have interrupts off and we
* already hold the SMI lock.
*/
if (!smi_info->run_to_completion)
spin_lock(&(smi_info->msg_lock));
/* Pick the high priority queue first. */
if (!list_empty(&(smi_info->hp_xmit_msgs))) {
entry = smi_info->hp_xmit_msgs.next;
@ -394,9 +386,6 @@ static enum si_sm_result start_next_msg(struct smi_info *smi_info)
rv = SI_SM_CALL_WITHOUT_DELAY;
}
out:
if (!smi_info->run_to_completion)
spin_unlock(&(smi_info->msg_lock));
return rv;
}
@ -879,19 +868,6 @@ static void sender(void *send_info,
printk("**Enqueue: %d.%9.9d\n", t.tv_sec, t.tv_usec);
#endif
/*
* last_timeout_jiffies is updated here to avoid
* smi_timeout() handler passing very large time_diff
* value to smi_event_handler() that causes
* the send command to abort.
*/
smi_info->last_timeout_jiffies = jiffies;
mod_timer(&smi_info->si_timer, jiffies + SI_TIMEOUT_JIFFIES);
if (smi_info->thread)
wake_up_process(smi_info->thread);
if (smi_info->run_to_completion) {
/*
* If we are running to completion, then throw it in
@ -914,15 +890,26 @@ static void sender(void *send_info,
return;
}
spin_lock_irqsave(&smi_info->msg_lock, flags);
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);
spin_unlock_irqrestore(&smi_info->msg_lock, flags);
spin_lock_irqsave(&smi_info->si_lock, flags);
if (smi_info->si_state == SI_NORMAL && smi_info->curr_msg == NULL) {
/*
* last_timeout_jiffies is updated here to avoid
* smi_timeout() handler passing very large time_diff
* value to smi_event_handler() that causes
* the send command to abort.
*/
smi_info->last_timeout_jiffies = jiffies;
mod_timer(&smi_info->si_timer, jiffies + SI_TIMEOUT_JIFFIES);
if (smi_info->thread)
wake_up_process(smi_info->thread);
start_next_msg(smi_info);
smi_event_handler(smi_info, 0);
}
@ -1026,16 +1013,19 @@ static int ipmi_thread(void *data)
static void poll(void *send_info)
{
struct smi_info *smi_info = send_info;
unsigned long flags;
unsigned long flags = 0;
int run_to_completion = smi_info->run_to_completion;
/*
* Make sure there is some delay in the poll loop so we can
* drive time forward and timeout things.
*/
udelay(10);
spin_lock_irqsave(&smi_info->si_lock, flags);
if (!run_to_completion)
spin_lock_irqsave(&smi_info->si_lock, flags);
smi_event_handler(smi_info, 10);
spin_unlock_irqrestore(&smi_info->si_lock, flags);
if (!run_to_completion)
spin_unlock_irqrestore(&smi_info->si_lock, flags);
}
static void request_events(void *send_info)
@ -1672,10 +1662,8 @@ static struct smi_info *smi_info_alloc(void)
{
struct smi_info *info = kzalloc(sizeof(*info), GFP_KERNEL);
if (info) {
if (info)
spin_lock_init(&info->si_lock);
spin_lock_init(&info->msg_lock);
}
return info;
}