On 10/27/2011 11:21 PM, Lin Ming wrote:
@@ -3208,6 +3209,11 @@ int ata_scsi_queuecmd(struct Scsi_Host *shost, struct scsi_cmnd *cmd) ap = ata_shost_to_port(shost); + if (pm_runtime_suspended(&ap->tdev)) + pm_runtime_resume(&ap->tdev); + pm_runtime_mark_last_busy(&ap->tdev); + pm_request_autosuspend(&ap->tdev); + spin_lock_irqsave(ap->lock, irq_flags);
Putting this into the core command dispatch fast-path is rather disappointing. That's at least one additional lock, plus some atomic instructions and tests.
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