-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 1/7/2014 2:49 AM, Aaron Lu wrote: > We can modify the device's system resume callback. To better > illustrate the idea, I just made two patches to do this and I did > some quick tests and didn't find anything wrong. That misses one key aspect I was trying to capture: it always leaves the disk runtime suspended after a resume. If the disk spins up on its own, as most ata disks do, then the runtime status doesn't correctly reflect the actual state of the disk. This means that applications that delay activities due to the runtime pm status to avoid waking a disk won't run, and any runtime autosuspend won't kick in to actually put the disk back to sleep. To do that, you need to be able to issue a REQUEST SENSE and conditionally resume the device. Of course, you can't do that unless you first get it into a transitional state, but you can't just request a resume and then conditionally fail it. -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.17 (MingW32) Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ iQEcBAEBAgAGBQJSzBQiAAoJEI5FoCIzSKrwH9UH/3Z3TfKKKYhNsjr26YsKOge2 EQzbcFCg4H5irnKL/olR5fnRKpZYi1Er2ydV6zsHdcCJLFQoqvzVE4ZInl42STI0 IWQ65n5q+U1OaZY+ttGkOBjixi5VIlkb9izZVbzBTi4n5cLEDwyQsE4Rgd9STwjm gPkNrmGNGPUoY+4O6bLHu0/WvwTX3L/OgxcSsQd1gsdCX3qZzB+UIzfM31W9/4Yl 3sP/tN8mBYcpqR9jIpw2u7m0XEe9Wc71Nepdv2+6sT5uZJ5knTY6epH5Of4FJsyp CxslFXf6Jb2FZaey8EJB1ocABnePYluQNHrpdRO4gjY+Au/mtzk15tJjoYx3WXg= =VlKV -----END PGP SIGNATURE----- -- 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
