Hi, all These 4 patches add ata port runtime pm support. v1: https://lkml.org/lkml/2011/11/2/23 v2 is totally different than v1. v1 performed ata port runtime pm through scsi layer. Added hook to scsi host runtime suspend/resume code. I realized that this is not the natural way to do ata port runtime pm. It does not deal with the races with ata port system suspend/resume. With v2, ata port is made to be parent device of scsi host. Currently, the device tree of ata port and scsi host looks as below, /sys/devices/pci0000:00/0000:00:1f.2 (ahci controller) |-- ata1 (ata port) |-- host0 (scsi host) |-- target0:0:0 (scsi target) |-- 0:0:0:0 (disk) v2 changes it to: /sys/devices/pci0000:00/0000:00:1f.2 (ahci controller) |-- ata1 (ata port) |-- host0 (scsi host) |-- target0:0:0 (scsi target) |-- 0:0:0:0 (disk) So ata port runtime PM will happen as: disk suspend --> scsi target suspend --> scsi host suspend --> ata port suspend. This is much cleaner and natural. Lin Ming (4): ata: make ata port as parent device of scsi host scsi: add flag to skip the runtime PM calls on host in EH ata: add ata port system PM callbacks ata: add ata port runtime PM callbacks drivers/ata/libata-core.c | 158 ++++++++++++++++++++++------------------ drivers/ata/libata-scsi.c | 3 +- drivers/ata/libata-transport.c | 5 + drivers/ata/libata.h | 1 + drivers/scsi/scsi_error.c | 5 +- include/scsi/scsi_host.h | 3 + 6 files changed, 102 insertions(+), 73 deletions(-) Thanks for any comment. Lin Min -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
