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[SCSI] fix scsi_reap_target() device_del from atomic context 

scsi_reap_target() was desgined to be called from any context.
However it must do a device_del() of the target device, which may only
be called from user context.  Thus we have to reimplement
scsi_reap_target() via a workqueue.

Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
This commit is contained in:
James Bottomley 2005-12-15 20:01:43 -08:00 committed by James Bottomley
parent 42e33148df
commit 863a930a40
1 changed files with 38 additions and 10 deletions
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48
drivers/scsi/scsi_scan.c
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@ -400,6 +400,35 @@ static struct scsi_target *scsi_alloc_target(struct device *parent,
return found_target;
}
struct work_queue_wrapper {
struct work_struct work;
struct scsi_target *starget;
};
static void scsi_target_reap_work(void *data) {
struct work_queue_wrapper *wqw = (struct work_queue_wrapper *)data;
struct scsi_target *starget = wqw->starget;
struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
unsigned long flags;
kfree(wqw);
spin_lock_irqsave(shost->host_lock, flags);
if (--starget->reap_ref == 0 && list_empty(&starget->devices)) {
list_del_init(&starget->siblings);
spin_unlock_irqrestore(shost->host_lock, flags);
device_del(&starget->dev);
transport_unregister_device(&starget->dev);
put_device(&starget->dev);
return;
}
spin_unlock_irqrestore(shost->host_lock, flags);
return;
}
/**
* scsi_target_reap - check to see if target is in use and destroy if not
*
@ -411,19 +440,18 @@ static struct scsi_target *scsi_alloc_target(struct device *parent,
*/
void scsi_target_reap(struct scsi_target *starget)
{
struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
unsigned long flags;
spin_lock_irqsave(shost->host_lock, flags);
struct work_queue_wrapper *wqw =
kzalloc(sizeof(struct work_queue_wrapper), GFP_ATOMIC);
if (--starget->reap_ref == 0 && list_empty(&starget->devices)) {
list_del_init(&starget->siblings);
spin_unlock_irqrestore(shost->host_lock, flags);
device_del(&starget->dev);
transport_unregister_device(&starget->dev);
put_device(&starget->dev);
if (!wqw) {
starget_printk(KERN_ERR, starget,
"Failed to allocate memory in scsi_reap_target()\n");
return;
}
spin_unlock_irqrestore(shost->host_lock, flags);
INIT_WORK(&wqw->work, scsi_target_reap_work, wqw);
wqw->starget = starget;
schedule_work(&wqw->work);
}
/**