ipmi: reduce polling

We can reasonably alter the poll rate depending on whether we're
performing a transaction or merely waiting for an event.

Signed-off-by: Matthew Garrett <mjg@redhat.com>
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>

1 files changed, 13 insertions, 7 deletions

diff --git a/drivers/char/ipmi/ipmi_si_intf.c b/drivers/char/ipmi/ipmi_si_intf.c
index c8d68cf68598..46bf2a97d6cb 100644
--- a/drivers/char/ipmi/ipmi_si_intf.c
+++ b/drivers/char/ipmi/ipmi_si_intf.c
@@ -893,6 +893,9 @@ static void sender(void                *send_info,
 
         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
@@ -1013,6 +1016,8 @@ static int ipmi_thread(void *data)
                         ; /* do nothing */
                 else if (smi_result == SI_SM_CALL_WITH_DELAY && busy_wait)
                         schedule();
+                else if (smi_result == SI_SM_IDLE)
+                        schedule_timeout_interruptible(100);
                 else
                         schedule_timeout_interruptible(0);
         }
@@ -1055,6 +1060,7 @@ static void smi_timeout(unsigned long data)
         unsigned long     flags;
         unsigned long     jiffies_now;
         long              time_diff;
+        long              timeout;
 #ifdef DEBUG_TIMING
         struct timeval    t;
 #endif
@@ -1075,9 +1081,9 @@ static void smi_timeout(unsigned long data)
 
         if ((smi_info->irq) && (!smi_info->interrupt_disabled)) {
                 /* Running with interrupts, only do long timeouts. */
-                smi_info->si_timer.expires = jiffies + SI_TIMEOUT_JIFFIES;
+                timeout = jiffies + SI_TIMEOUT_JIFFIES;
                 smi_inc_stat(smi_info, long_timeouts);
-                goto do_add_timer;
+                goto do_mod_timer;
         }
 
         /*
@@ -1086,15 +1092,15 @@ static void smi_timeout(unsigned long data)
          */
         if (smi_result == SI_SM_CALL_WITH_DELAY) {
                 smi_inc_stat(smi_info, short_timeouts);
-                smi_info->si_timer.expires = jiffies + 1;
+                timeout = jiffies + 1;
         } else {
                 smi_inc_stat(smi_info, long_timeouts);
-                smi_info->si_timer.expires = jiffies + SI_TIMEOUT_JIFFIES;
+                timeout = jiffies + SI_TIMEOUT_JIFFIES;
         }
 
- do_add_timer:
-        if ((smi_result != SI_SM_IDLE) || smi_info->interrupt_disabled)
-                add_timer(&(smi_info->si_timer));
+ do_mod_timer:
+        if (smi_result != SI_SM_IDLE)
+                mod_timer(&(smi_info->si_timer), timeout);
 }
 
 static irqreturn_t si_irq_handler(int irq, void *data)