Re: SCSI dynamic power management

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On Mon, 19 Nov 2007, Matthew Wilcox wrote:

> On Mon, Nov 19, 2007 at 02:16:12PM -0500, Alan Stern wrote:
> > Regarding this thread's original question, the best idea I've come up
> > with so far is to store an extra flag in the scsi_device structure
> > indicating that a suspend or resume transition is underway.  When the
> > flag is set, commands with REQ_PREEMPT would be accepted.  If the
> > device is "suspended" and the flag is clear, then commands would be
> > delayed or killed in the prep function regardless of REQ_PREEMPT.  This 
> > scheme could potentially let unwanted commands go through, but I 
> > haven't been able to think of anything more suitable.
> 
> You could allow only START_STOP and TUR to go through?

That's a pretty good idea...

There will be other problems to sort out.  For example, if someone is 
using a SCSI cdrom drive to play an audio CD, it will appear to the 
system that the drive is idle because no commands will flow.  But that 
sort of thing can be handled later.

Alan Stern

-
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

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Index of Archives]     [SCSI Target Devel]     [Linux SCSI Target Infrastructure]     [Kernel Newbies]     [IDE]     [Security]     [Git]     [Netfilter]     [Bugtraq]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Linux ATA RAID]     [Linux IIO]     [Samba]     [Device Mapper]
  Powered by Linux