On Thu, 2010-09-16 at 15:00 -0700, Joe Eykholt wrote: > > It seems to me we can't completely move the host lock down into the > drivers since its a shared lock between SCSI and the drivers now. > > If we just have SCSI drop the lock and have the LLD reacquire it, > that may open up a hole that some LLDs might not tolerate. > It also hurts performance for the LLDs that want to keep > the lock for the duration of queuecommand() by adding an extra > unlock/lock. It may be even better if we can completely drop the lock in scsi_dispatch_cmd. The other reason host_lock was taken there was to serialize the increment and assignment of a scsi command serial number. So maybe we can make the serial number counter an atomic. We can just let the driver decide if they need a lock to serialize their queue command. Tim -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
