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authorTejun Heo <htejun@gmail.com>2007-09-23 13:14:13 +0900
committerJeff Garzik <jeff@garzik.org>2007-10-12 14:55:41 -0400
commite31e8531d668c9c4dc7883054788f89805188003 (patch)
tree9c3762792344d24c996d6459409456664a2e381b /drivers/ata
parent668108d73bbb1ae85f01db38d6be822fd28ece1f (diff)
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 <htejun@gmail.com> Signed-off-by: Jeff Garzik <jeff@garzik.org>
Diffstat (limited to 'drivers/ata')
-rw-r--r--drivers/ata/libata-scsi.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index 8ca2caeed01..451f79c6fba 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 */