On Wed, May 16, 2012 at 03:54:06PM -0400, chetan loke wrote:
> I thought that 'scsi_ram_device_thread' has a
> 'wait_event_interruptible' call if it sees that the list is empty. I
> don't see that call that's why the confusion. Either queuecmd or
> kthread will get the lock and so why keep the kthread spinning in that
> while loop if there's nothing to do?
It doesn't spin, it sleeps:
+ spin_lock_irqsave(host->host_lock, flags);
+ if (list_empty(&ram_device->commands)) {
+ set_current_state(TASK_INTERRUPTIBLE);
+ spin_unlock_irqrestore(host->host_lock, flags);
+ schedule();
+ continue;
+ }
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