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@xxxxxxxxx>
---
drivers/ata/libata-scsi.c | 7 +++++++
include/linux/libata.h | 1 +
2 files changed, 8 insertions(+), 0 deletions(-)
diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index 1a1c018..3b8693f 100644
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -950,6 +950,13 @@ 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 717fdb5..4e37180 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -325,6 +325,7 @@ enum {
ATA_HORKAGE_NODMA = (1 << 1), /* DMA problems */
ATA_HORKAGE_NONCQ = (1 << 2), /* Don't use NCQ */
ATA_HORKAGE_MAX_SEC_128 = (1 << 3), /* Limit max sects to 128 */
+ ATA_HORKAGE_SKIP_PM = (1 << 4), /* Skip PM operations */
};
enum hsm_task_states {
--
1.5.0.3
-
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