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[PATCH] ipmi: high-res timer support fixes 

Fix some problems with the high-res timer support.

Signed-off-by: Corey Minyard <minyard@acm.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Corey Minyard 2005-09-06 15:18:38 -07:00 committed by Linus Torvalds
parent c14979b993
commit 75b0768a39
1 changed files with 21 additions and 15 deletions
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36
drivers/char/ipmi/ipmi_si_intf.c
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@ -61,11 +61,11 @@
# endif
static inline void add_usec_to_timer(struct timer_list *t, long v)
{
t->sub_expires += nsec_to_arch_cycle(v * 1000);
while (t->sub_expires >= arch_cycles_per_jiffy)
t->arch_cycle_expires += nsec_to_arch_cycle(v * 1000);
while (t->arch_cycle_expires >= arch_cycles_per_jiffy)
{
t->expires++;
t->sub_expires -= arch_cycles_per_jiffy;
t->arch_cycle_expires -= arch_cycles_per_jiffy;
}
}
#endif
@ -762,18 +762,20 @@ static void si_restart_short_timer(struct smi_info *smi_info)
#if defined(CONFIG_HIGH_RES_TIMERS)
unsigned long flags;
unsigned long jiffies_now;
unsigned long seq;
if (del_timer(&(smi_info->si_timer))) {
/* If we don't delete the timer, then it will go off
immediately, anyway. So we only process if we
actually delete the timer. */
/* We already have irqsave on, so no need for it
here. */
read_lock(&xtime_lock);
jiffies_now = jiffies;
smi_info->si_timer.expires = jiffies_now;
smi_info->si_timer.sub_expires = get_arch_cycles(jiffies_now);
do {
seq = read_seqbegin_irqsave(&xtime_lock, flags);
jiffies_now = jiffies;
smi_info->si_timer.expires = jiffies_now;
smi_info->si_timer.arch_cycle_expires
= get_arch_cycles(jiffies_now);
} while (read_seqretry_irqrestore(&xtime_lock, seq, flags));
add_usec_to_timer(&smi_info->si_timer, SI_SHORT_TIMEOUT_USEC);
@ -827,15 +829,19 @@ static void smi_timeout(unsigned long data)
/* If the state machine asks for a short delay, then shorten
the timer timeout. */
if (smi_result == SI_SM_CALL_WITH_DELAY) {
#if defined(CONFIG_HIGH_RES_TIMERS)
unsigned long seq;
#endif
spin_lock_irqsave(&smi_info->count_lock, flags);
smi_info->short_timeouts++;
spin_unlock_irqrestore(&smi_info->count_lock, flags);
#if defined(CONFIG_HIGH_RES_TIMERS)
read_lock(&xtime_lock);
smi_info->si_timer.expires = jiffies;
smi_info->si_timer.sub_expires
= get_arch_cycles(smi_info->si_timer.expires);
read_unlock(&xtime_lock);
do {
seq = read_seqbegin_irqsave(&xtime_lock, flags);
smi_info->si_timer.expires = jiffies;
smi_info->si_timer.arch_cycle_expires
= get_arch_cycles(smi_info->si_timer.expires);
} while (read_seqretry_irqrestore(&xtime_lock, seq, flags));
add_usec_to_timer(&smi_info->si_timer, SI_SHORT_TIMEOUT_USEC);
#else
smi_info->si_timer.expires = jiffies + 1;
@ -846,7 +852,7 @@ static void smi_timeout(unsigned long data)
spin_unlock_irqrestore(&smi_info->count_lock, flags);
smi_info->si_timer.expires = jiffies + SI_TIMEOUT_JIFFIES;
#if defined(CONFIG_HIGH_RES_TIMERS)
smi_info->si_timer.sub_expires = 0;
smi_info->si_timer.arch_cycle_expires = 0;
#endif
}