On Fri, 6 Sep 2013, James Bottomley wrote: > > layer runtime PM. Accordingly, the SCSI bus layer runtime PM callback is > > simplified as all SCSI devices that implement runtime PM are now request > > based. > > OK, let's now try for a descriptive changelog. All SCSI devices > (including sr) are "request based". I think what you mean is "all SCSI > devices which implement runtime PM have an exposed block device"? Actually Aaron means "All SCSI drivers implementing runtime PM now use the block layer's request-based mechanism." > > Note that due to ODD will be polled every 2 seconds, > > Since the device will be polled every 2 seconds > > > for suspend to > > actually happen, the autosuspend_delay can not be set to more than 2 > > seconds or the polling interval has to be increased. > > Is this true? What about event driven devices? Supposing a distro has > a different interval. > > How about > > If your Distribution polls the device, the autosuspend interval cannot > be set to longer than the polling interval otherwise the device will > never suspend. The default polling done by the kernel uses 2-second intervals. Of course, distributions and users can change this or disable it entirely. 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
