1 files changed, 20 insertions, 0 deletions

diff --git a/drivers/ide/ide-atapi.c b/drivers/ide/ide-atapi.c
index 8f0842ce77f5..da71bfce92e8 100644
--- a/drivers/ide/ide-atapi.c
+++ b/drivers/ide/ide-atapi.c
@@ -119,6 +119,26 @@ void ide_init_pc(struct ide_atapi_pc *pc)
 }
 EXPORT_SYMBOL_GPL(ide_init_pc);
 
+/*
+ * Generate a new packet command request in front of the request queue, before
+ * the current request, so that it will be processed immediately, on the next
+ * pass through the driver.
+ */
+void ide_queue_pc_head(ide_drive_t *drive, struct gendisk *disk,
+                       struct ide_atapi_pc *pc, struct request *rq)
+{
+        blk_rq_init(NULL, rq);
+        rq->cmd_type = REQ_TYPE_SPECIAL;
+        rq->cmd_flags |= REQ_PREEMPT;
+        rq->buffer = (char *)pc;
+        rq->rq_disk = disk;
+        memcpy(rq->cmd, pc->c, 12);
+        if (drive->media == ide_tape)
+                rq->cmd[13] = REQ_IDETAPE_PC1;
+        ide_do_drive_cmd(drive, rq);
+}
+EXPORT_SYMBOL_GPL(ide_queue_pc_head);
+
 /* TODO: unify the code thus making some arguments go away */
 ide_startstop_t ide_pc_intr(ide_drive_t *drive, struct ide_atapi_pc *pc,
         ide_handler_t *handler, unsigned int timeout, ide_expiry_t *expiry,