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libata-pmp-prep: implement ATA_HORKAGE_SKIP_PM

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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 <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Tejun Heo 2007-09-23 13:14:13 +09:00 committed by Jeff Garzik
parent 668108d73b
commit e31e8531d6
2 changed files with 8 additions and 0 deletions
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7
drivers/ata/libata-scsi.c
View File

@ -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 */

1
include/linux/libata.h
View File

@ -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 {