On Wed, 21 Oct 2009, Oliver Neukum wrote: > > > OK, so why don't we take the hint from the SCSI layer? > > > > Layering makes it very awkward. Have you looked at sd_suspend() in > > drivers/scsi/sd.c? > > We need to get at scsi_disk and it is the gold standard. That's my point. I don't want to get at scsi_disk. If there's no other way then I'll forget the whole idea. > > Yes, but it's still ugly. usb-storage would have to maintain its own > > array of state information for all the LUNs present. > > struct scsi_device has a hook for the low level driver. What hook are you referring to? > > Yes, all right. To tell the truth, I would prefer to avoid all these > > difficulties and not worry about autosuspending card readers and such. > > (Unless the user disables hal's probing.) We can emphasize that this > > is only a partial, potentially unsafe, autosuspend implementation. > > This would have the perverted effect of working autosuspend for a mounted > device and no autosuspend for an empty device. Probing for media insertion is going to cause problems for power management in other areas in addition to USB. Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
