From e31e8531d668c9c4dc7883054788f89805188003 Mon Sep 17 00:00:00 2001 From: Tejun Heo Date: Sun, 23 Sep 2007 13:14:13 +0900 Subject: [PATCH] libata-pmp-prep: implement ATA_HORKAGE_SKIP_PM Some pseudo devices fail PM commands unnecessarily aborting system suspend. Implement ATA_HORKAGE_SKIP_PM which makes libata skip PM commands for these devices. Signed-off-by: Tejun Heo Signed-off-by: Jeff Garzik --- drivers/ata/libata-scsi.c | 7 +++++++ include/linux/libata.h | 1 + 2 files changed, 8 insertions(+) diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c index 8ca2caeed017..451f79c6fbac 100644 --- a/drivers/ata/libata-scsi.c +++ b/drivers/ata/libata-scsi.c @@ -944,6 +944,13 @@ static unsigned int ata_scsi_start_stop_xlat(struct ata_queued_cmd *qc) goto invalid_fld; /* LOEJ bit set not supported */ if (((cdb[4] >> 4) & 0xf) != 0) goto invalid_fld; /* power conditions not supported */ + + if (qc->dev->horkage & ATA_HORKAGE_SKIP_PM) { + /* the device lacks PM support, finish without doing anything */ + scmd->result = SAM_STAT_GOOD; + return 1; + } + if (cdb[4] & 0x1) { tf->nsect = 1; /* 1 sector, lba=0 */ diff --git a/include/linux/libata.h b/include/linux/libata.h index 2bd1d26c9c8d..56b218771114 100644 --- a/include/linux/libata.h +++ b/include/linux/libata.h @@ -329,6 +329,7 @@ enum { ATA_HORKAGE_NONCQ = (1 << 2), /* Don't use NCQ */ ATA_HORKAGE_MAX_SEC_128 = (1 << 3), /* Limit max sects to 128 */ ATA_HORKAGE_BROKEN_HPA = (1 << 4), /* Broken HPA */ + ATA_HORKAGE_SKIP_PM = (1 << 5), /* Skip PM operations */ }; enum hsm_task_states {