When ODD is runtime suspended and if it can be powered off(reflected by
the can_power_off flag), we will block events checking for it so that it
can stay in powered off state until resumed by:
1 user pressing the eject button or inserting a disc;
2 software opening the block device.
But not by events checking that normally occurs every 2 seconds.
Old versions of udisk will poll the ODD periodically, so it is advised
to inhibit the polling:
$ udisks --inhibit-polling /dev/sr0
Signed-off-by: Aaron Lu <aaron.lu@xxxxxxxxx>
---
drivers/scsi/sr.c | 10 ++++++++++
drivers/scsi/sr.h | 1 +
2 files changed, 11 insertions(+)
diff --git a/drivers/scsi/sr.c b/drivers/scsi/sr.c
index 04a658b..1acfe0e 100644
--- a/drivers/scsi/sr.c
+++ b/drivers/scsi/sr.c
@@ -204,6 +204,11 @@ static int sr_suspend(struct device *dev, pm_message_t msg)
if (!suspend)
return -EBUSY;
+ if (cd->device->can_power_off) {
+ cd->disk_events_blocked = 1;
+ disk_block_events(cd->disk);
+ }
+
return 0;
}
@@ -224,6 +229,11 @@ static int sr_resume(struct device *dev)
sr_tray_move(&cd->cdi, 1);
}
+ if (cd->disk_events_blocked) {
+ cd->disk_events_blocked = 0;
+ disk_unblock_events(cd->disk);
+ }
+
return 0;
}
diff --git a/drivers/scsi/sr.h b/drivers/scsi/sr.h
index 37c8f6b..9d9a76f 100644
--- a/drivers/scsi/sr.h
+++ b/drivers/scsi/sr.h
@@ -41,6 +41,7 @@ typedef struct scsi_cd {
unsigned readcd_known:1; /* drive supports READ_CD (0xbe) */
unsigned readcd_cdda:1; /* reading audio data using READ_CD */
unsigned media_present:1; /* media is present */
+ unsigned disk_events_blocked:1; /* disk events is blocked */
/* GET_EVENT spurious event handling, blk layer guarantees exclusion */
int tur_mismatch; /* nr of get_event TUR mismatches */
--
1.7.11.5
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