Re: autosuspend for storage devices
Oliver Neukum <[email protected]>
| Newsgroups | gmane.linux.usb.devel |
|---|---|
| Message-ID | <[email protected]> |
Am Freitag, 9. Februar 2007 19:06 schrieb Alan Stern: > On Fri, 9 Feb 2007, Oliver Neukum wrote: > > > Hi, > > > > here's autosuspend for storage devices. It was surprisingly easy. > > I've tested it and I can play an mp3 and see how the stick wakes > > up every few seconds. Comments? > > To test this you'll likely have to turn off haldaemon. This still > > needs a solution. > > The patch isn't really right. For one thing, you removed some mutexes > that are necessary (don't forget that suspend can come from sources other > than autosuspend). Yes, I am currently finding out what is to guard against. This was not the final version, just a friday publish before dinner thing. I'll be more explicit next time. > Also, it's debatable whether USB should autosuspend a storage device at > all. Like with HID devices, it seems more logical to have autosuspend > requests come up from the lower layer (in this case the SCSI layer). > After all, suspending a disk could cause it to spin down, which is > something the SCSI disk driver might want to be aware of. You could raise > this question on the linux-scsi mailing list. I will. But which devices don't have an upper layer. And strictly speaking I am not suspending devices. I am managing vetos. Regards Oliver ------------------------------------------------------------------------- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier. Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 _______________________________________________ [email protected] To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel