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pm: use rmutex_xx API for recursive lock

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Signed-off-by: ligd <liguiding1@xiaomi.com>
This commit is contained in:
ligd 2022-07-22 12:07:27 +08:00 committed by Xiang Xiao
parent f9849c7f60
commit d8ebe98c6c
3 changed files with 5 additions and 68 deletions
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8
drivers/power/pm.h
View File

@ -79,13 +79,9 @@ struct pm_domain_s
FAR const struct pm_governor_s *governor;
/* This semaphore manages mutually exclusive access to the domain state.
* It must be initialized to the value 1.
*/
/* Recursive lock for race condition */
sem_t sem;
pid_t holder;
unsigned int count;
rmutex_t lock;
};
/* This structure encapsulates all of the global data used by the PM system */

5
drivers/power/pm_initialize.c
View File

@ -92,10 +92,7 @@ void pm_initialize(void)
#endif
pm_set_governor(i, gov);
nxsem_init(&g_pmglobals.domain[i].sem, 0, 1);
g_pmglobals.domain[i].holder = INVALID_PROCESS_ID;
g_pmglobals.domain[i].count = 0;
nxrmutex_init(&g_pmglobals.domain[i].lock);
}
}

60
drivers/power/pm_lock.c
View File

@ -33,62 +33,6 @@
#if defined(CONFIG_PM)
/****************************************************************************
* Private Functions
****************************************************************************/
static int pm_recursive_lock(struct pm_domain_s *pm)
{
pid_t me = gettid();
int ret = OK;
/* Does this thread already hold the semaphore? */
if (pm->holder == me)
{
/* Yes.. just increment the reference count */
pm->count++;
}
else
{
/* No.. take the semaphore (perhaps waiting) */
ret = nxsem_wait_uninterruptible(&pm->sem);
if (ret >= 0)
{
/* Now this thread holds the semaphore */
pm->holder = me;
pm->count = 1;
}
}
return ret;
}
static void pm_recursive_unlock(struct pm_domain_s *pm)
{
DEBUGASSERT(pm->holder == getpid() && pm->count > 0);
/* If the count would go to zero, then release the semaphore */
if (pm->count == 1)
{
/* We no longer hold the semaphore */
pm->holder = INVALID_PROCESS_ID;
pm->count = 0;
nxsem_post(&pm->sem);
}
else
{
/* We still hold the semaphore. Just decrement the count */
pm->count--;
}
}
/****************************************************************************
* Public Functions
****************************************************************************/
@ -108,7 +52,7 @@ irqstate_t pm_lock(int domain)
{
if (!up_interrupt_context() && !sched_idletask())
{
pm_recursive_lock(&g_pmglobals.domain[domain]);
nxrmutex_lock(&g_pmglobals.domain[domain].lock);
}
return enter_critical_section();
@ -131,7 +75,7 @@ void pm_unlock(int domain, irqstate_t flags)
if (!up_interrupt_context() && !sched_idletask())
{
pm_recursive_unlock(&g_pmglobals.domain[domain]);
nxrmutex_unlock(&g_pmglobals.domain[domain].lock);
}
}