On 09/13/2012 04:14 PM, James Bottomley wrote: > On Thu, 2012-09-13 at 15:40 +0800, Aaron Lu wrote: >> The ready_to_power_off flag is used to give indication to ATA layer >> if this device's power can be removed when runtime suspended. >> >> This flag is determined by individual SCSI driver like sr, sd. >> >> This flag is introduced to support zero power ODD. When ODD >> is runtime suspended, it may not be OK to remove its power. >> >> But for disk, it is always OK to be powered off, so set this flag. > > It is? I may have missed this, but where do you flush the cache of write > back cache devices you're about to power off? I suppose that is handled in sd_suspend callback, the power off happens after a device is runtime suspended. Thanks, Aaron -- To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
