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libata-core: convert to use cancel_rearming_delayed_work()

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We should not use cancel_work_sync(delayed_work->work). This works, but not
good. We can use cancel_rearming_delayed_work(), this also simplifies the
code.

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Oleg Nesterov 2007-07-09 11:46:13 -07:00 committed by Jeff Garzik
parent 4c75f7416f
commit 45a66c1c3f
2 changed files with 4 additions and 41 deletions
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44
drivers/ata/libata-core.c
View file

@ -1283,18 +1283,11 @@ static unsigned int ata_id_xfermask(const u16 *id)
void ata_port_queue_task(struct ata_port *ap, work_func_t fn, void *data,
unsigned long delay)
{
int rc;
if (ap->pflags & ATA_PFLAG_FLUSH_PORT_TASK)
return;
PREPARE_DELAYED_WORK(&ap->port_task, fn);
ap->port_task_data = data;
rc = queue_delayed_work(ata_wq, &ap->port_task, delay);
/* rc == 0 means that another user is using port task */
WARN_ON(rc == 0);
/* may fail if ata_port_flush_task() in progress */
queue_delayed_work(ata_wq, &ap->port_task, delay);
}
/**
@ -1309,32 +1302,9 @@ void ata_port_queue_task(struct ata_port *ap, work_func_t fn, void *data,
*/
void ata_port_flush_task(struct ata_port *ap)
{
unsigned long flags;
DPRINTK("ENTER\n");
spin_lock_irqsave(ap->lock, flags);
ap->pflags |= ATA_PFLAG_FLUSH_PORT_TASK;
spin_unlock_irqrestore(ap->lock, flags);
DPRINTK("flush #1\n");
cancel_work_sync(&ap->port_task.work); /* akpm: seems unneeded */
/*
* At this point, if a task is running, it's guaranteed to see
* the FLUSH flag; thus, it will never queue pio tasks again.
* Cancel and flush.
*/
if (!cancel_delayed_work(&ap->port_task)) {
if (ata_msg_ctl(ap))
ata_port_printk(ap, KERN_DEBUG, "%s: flush #2\n",
__FUNCTION__);
cancel_work_sync(&ap->port_task.work);
}
spin_lock_irqsave(ap->lock, flags);
ap->pflags &= ~ATA_PFLAG_FLUSH_PORT_TASK;
spin_unlock_irqrestore(ap->lock, flags);
cancel_rearming_delayed_work(&ap->port_task);
if (ata_msg_ctl(ap))
ata_port_printk(ap, KERN_DEBUG, "%s: EXIT\n", __FUNCTION__);
@ -6557,13 +6527,7 @@ void ata_port_detach(struct ata_port *ap)
spin_unlock_irqrestore(ap->lock, flags);
ata_port_wait_eh(ap);
/* Flush hotplug task. The sequence is similar to
* ata_port_flush_task().
*/
cancel_work_sync(&ap->hotplug_task.work); /* akpm: why? */
cancel_delayed_work(&ap->hotplug_task);
cancel_work_sync(&ap->hotplug_task.work);
cancel_rearming_delayed_work(&ap->hotplug_task);
skip_eh:
/* remove the associated SCSI host */

1
include/linux/libata.h
View file

@ -196,7 +196,6 @@ enum {
ATA_PFLAG_SCSI_HOTPLUG = (1 << 6), /* SCSI hotplug scheduled */
ATA_PFLAG_INITIALIZING = (1 << 7), /* being initialized, don't touch */
ATA_PFLAG_FLUSH_PORT_TASK = (1 << 16), /* flush port task */
ATA_PFLAG_SUSPENDED = (1 << 17), /* port is suspended (power) */
ATA_PFLAG_PM_PENDING = (1 << 18), /* PM operation pending */
ATA_PFLAG_GTM_VALID = (1 << 19), /* acpi_gtm data valid */