ide: add ide_queue_pc_tail() helper

[linux-2.6-omap-h63xx.git] / drivers / ide / ide-atapi.c

diff --git a/drivers/ide/ide-atapi.c b/drivers/ide/ide-atapi.c
index da71bfce92e8b11abfcb0b147fa2030895a117f3..f82ddfb9a44e8e610fbbfe382238bebcc1658883 100644 (file)
--- a/drivers/ide/ide-atapi.c
+++ b/drivers/ide/ide-atapi.c
@@ -139,6 +139,29 @@ void ide_queue_pc_head(ide_drive_t *drive, struct gendisk *disk,
 }
 EXPORT_SYMBOL_GPL(ide_queue_pc_head);
 
+/*
+ * Add a special packet command request to the tail of the request queue,
+ * and wait for it to be serviced.
+ */
+int ide_queue_pc_tail(ide_drive_t *drive, struct gendisk *disk,
+                     struct ide_atapi_pc *pc)
+{
+       struct request *rq;
+       int error;
+
+       rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
+       rq->cmd_type = REQ_TYPE_SPECIAL;
+       rq->buffer = (char *)pc;
+       memcpy(rq->cmd, pc->c, 12);
+       if (drive->media == ide_tape)
+               rq->cmd[13] = REQ_IDETAPE_PC1;
+       error = blk_execute_rq(drive->queue, disk, rq, 0);
+       blk_put_request(rq);
+
+       return error;
+}
+EXPORT_SYMBOL_GPL(ide_queue_pc_tail);
+
 /* 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,