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libata: add ata_ratelimit(), use it in AHCI driver irq handler

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This commit is contained in:
Jeff Garzik
2005-10-05 02:58:32 -04:00
parent 643736a58d
commit 67846b3017
3 changed files with 50 additions and 6 deletions
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23
drivers/scsi/libata-core.c
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@ -48,6 +48,7 @@
#include <linux/completion.h>
#include <linux/suspend.h>
#include <linux/workqueue.h>
#include <linux/jiffies.h>
#include <scsi/scsi.h>
#include "scsi.h"
#include "scsi_priv.h"
@ -4688,6 +4689,27 @@ static void __exit ata_exit(void)
module_init(ata_init);
module_exit(ata_exit);
static unsigned long ratelimit_time;
static spinlock_t ata_ratelimit_lock = SPIN_LOCK_UNLOCKED;
int ata_ratelimit(void)
{
int rc;
unsigned long flags;
spin_lock_irqsave(&ata_ratelimit_lock, flags);
if (time_after(jiffies, ratelimit_time)) {
rc = 1;
ratelimit_time = jiffies + (HZ/5);
} else
rc = 0;
spin_unlock_irqrestore(&ata_ratelimit_lock, flags);
return rc;
}
/*
* libata is essentially a library of internal helper functions for
* low-level ATA host controller drivers. As such, the API/ABI is
@ -4729,6 +4751,7 @@ EXPORT_SYMBOL_GPL(sata_phy_reset);
EXPORT_SYMBOL_GPL(__sata_phy_reset);
EXPORT_SYMBOL_GPL(ata_bus_reset);
EXPORT_SYMBOL_GPL(ata_port_disable);
EXPORT_SYMBOL_GPL(ata_ratelimit);
EXPORT_SYMBOL_GPL(ata_scsi_ioctl);
EXPORT_SYMBOL_GPL(ata_scsi_queuecmd);
EXPORT_SYMBOL_GPL(ata_scsi_error);