[libata] scsi: no poll when ODD is powered off

[karo-tx-linux.git] / drivers / scsi / scsi_lib.c

diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index f1bf5aff68ed0bf3f83e0eb28fb4182f57b2de3c..765398c063c7f751f383a279ac7ddaa9f841a05c 100644 (file)
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -2617,3 +2617,17 @@ void scsi_kunmap_atomic_sg(void *virt)
        kunmap_atomic(virt);
 }
 EXPORT_SYMBOL(scsi_kunmap_atomic_sg);
+
+void sdev_disable_disk_events(struct scsi_device *sdev)
+{
+       atomic_inc(&sdev->disk_events_disable_depth);
+}
+EXPORT_SYMBOL(sdev_disable_disk_events);
+
+void sdev_enable_disk_events(struct scsi_device *sdev)
+{
+       if (WARN_ON_ONCE(atomic_read(&sdev->disk_events_disable_depth) <= 0))
+               return;
+       atomic_dec(&sdev->disk_events_disable_depth);
+}
+EXPORT_SYMBOL(sdev_enable_disk_events);