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mmc: core: Hold a wake lock accross delayed work + mmc rescan

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Signed-off-by: San Mehat <san@android.com>

mmc: core: Rework mmc_delayed_work wakelock so that the wakelock is only extended if a card is added or removed.

Signed-off-by: San Mehat <san@google.com>
This commit is contained in:
San Mehat 2009-03-23 12:20:37 -07:00 • committed by John Stultz
commit bec7bcbb70
1 changed files with 16 additions and 1 deletions
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17
drivers/mmc/core/core.c
View file

@ -29,6 +29,7 @@
#include <linux/random.h>
#include <linux/slab.h>
#include <linux/of.h>
#include <linux/wakelock.h>
#include <linux/mmc/card.h>
#include <linux/mmc/host.h>
@ -56,6 +57,7 @@
#define MMC_BKOPS_MAX_TIMEOUT (4 * 60 * 1000) /* max time to wait in ms */
static struct workqueue_struct *workqueue;
static struct wake_lock mmc_delayed_work_wake_lock;
static const unsigned freqs[] = { 400000, 300000, 200000, 100000 };
/*
@ -72,6 +74,7 @@ module_param(use_spi_crc, bool, 0);
static int mmc_schedule_delayed_work(struct delayed_work *work,
unsigned long delay)
{
wake_lock(&mmc_delayed_work_wake_lock);
return queue_delayed_work(workqueue, work, delay);
}
@ -2566,6 +2569,7 @@ void mmc_rescan(struct work_struct *work)
struct mmc_host *host =
container_of(work, struct mmc_host, detect.work);
int i;
bool extend_wakelock = false;
if (host->trigger_card_event && host->ops->card_event) {
host->ops->card_event(host);
@ -2621,14 +2625,20 @@ void mmc_rescan(struct work_struct *work)
mmc_claim_host(host);
for (i = 0; i < ARRAY_SIZE(freqs); i++) {
if (!mmc_rescan_try_freq(host, max(freqs[i], host->f_min)))
if (!mmc_rescan_try_freq(host, max(freqs[i], host->f_min))) {
extend_wakelock = true;
break;
}
if (freqs[i] <= host->f_min)
break;
}
mmc_release_host(host);
out:
if (extend_wakelock)
wake_lock_timeout(&mmc_delayed_work_wake_lock, HZ / 2);
else
wake_unlock(&mmc_delayed_work_wake_lock);
if (host->caps & MMC_CAP_NEEDS_POLL)
mmc_schedule_delayed_work(&host->detect, HZ);
}
@ -2856,6 +2866,9 @@ static int __init mmc_init(void)
if (!workqueue)
return -ENOMEM;
wake_lock_init(&mmc_delayed_work_wake_lock, WAKE_LOCK_SUSPEND,
"mmc_delayed_work");
ret = mmc_register_bus();
if (ret)
goto destroy_workqueue;
@ -2876,6 +2889,7 @@ unregister_bus:
mmc_unregister_bus();
destroy_workqueue:
destroy_workqueue(workqueue);
wake_lock_destroy(&mmc_delayed_work_wake_lock);
return ret;
}
@ -2886,6 +2900,7 @@ static void __exit mmc_exit(void)
mmc_unregister_host_class();
mmc_unregister_bus();
destroy_workqueue(workqueue);
wake_lock_destroy(&mmc_delayed_work_wake_lock);
}
subsys_initcall(mmc_init);