| Message ID | 1358241665-2156-9-git-send-email-aaron.lu@intel.com (mailing list archive) |
|---|---|
| State | Not Applicable, archived |
| Headers | show |
On 01/15/2013 04:21 AM, Aaron Lu wrote: > For ODDs, the upper layer will poll for media change every few > seconds, which will make it enter and leave suspend state very > often. And as each suspend will also cause a hard/soft reset, > the gain of runtime suspend is very little while the ODD may > malfunction after constantly being reset. So the idle callback > here will not proceed to suspend if a non-ZPODD capable ODD is > attached to the port. > > Signed-off-by: Aaron Lu <aaron.lu@intel.com> > Acked-by: Tejun Heo <tj@kernel.org> > --- > drivers/ata/libata-core.c | 19 +++++++++++++++++++ > 1 file changed, 19 insertions(+) applied patches #2-6 and #8 -- To unsubscribe from this list: send the line "unsubscribe linux-pm" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On Mon, Jan 21, 2013 at 03:42:55PM -0500, Jeff Garzik wrote: > On 01/15/2013 04:21 AM, Aaron Lu wrote: > >For ODDs, the upper layer will poll for media change every few > >seconds, which will make it enter and leave suspend state very > >often. And as each suspend will also cause a hard/soft reset, > >the gain of runtime suspend is very little while the ODD may > >malfunction after constantly being reset. So the idle callback > >here will not proceed to suspend if a non-ZPODD capable ODD is > >attached to the port. > > > >Signed-off-by: Aaron Lu <aaron.lu@intel.com> > >Acked-by: Tejun Heo <tj@kernel.org> > >--- > > drivers/ata/libata-core.c | 19 +++++++++++++++++++ > > 1 file changed, 19 insertions(+) > > applied patches #2-6 and #8 Thanks! Now that patch 1 has ack from Alan Stern(and thus James), and consider the smatch warning of patch #3, I can either send out the remaining 3 patches(#1, #7 and #9) together with a small fix patch for the smatch warning or I can re-send the whole patchset. Just let me know which way you prefer, thanks. -Aaron -- To unsubscribe from this list: send the line "unsubscribe linux-pm" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c index c7ecd84..b7eed82 100644 --- a/drivers/ata/libata-core.c +++ b/drivers/ata/libata-core.c @@ -5413,8 +5413,27 @@ static int ata_port_resume(struct device *dev) return rc; } +/* + * For ODDs, the upper layer will poll for media change every few seconds, + * which will make it enter and leave suspend state every few seconds. And + * as each suspend will cause a hard/soft reset, the gain of runtime suspend + * is very little and the ODD may malfunction after constantly being reset. + * So the idle callback here will not proceed to suspend if a non-ZPODD capable + * ODD is attached to the port. + */ static int ata_port_runtime_idle(struct device *dev) { + struct ata_port *ap = to_ata_port(dev); + struct ata_link *link; + struct ata_device *adev; + + ata_for_each_link(link, ap, HOST_FIRST) { + ata_for_each_dev(adev, link, ENABLED) + if (adev->class == ATA_DEV_ATAPI && + !zpodd_dev_enabled(adev)) + return -EBUSY; + } + return pm_runtime_suspend(dev); }