1 files changed, 49 insertions, 0 deletions

diff --git a/drivers/ide/ide-atapi.c b/drivers/ide/ide-atapi.c
index 25939bc60402..932a83abaf06 100644
--- a/drivers/ide/ide-atapi.c
+++ b/drivers/ide/ide-atapi.c
@@ -68,3 +68,52 @@ ide_startstop_t ide_transfer_pc(ide_drive_t *drive, struct ide_atapi_pc *pc,
         return ide_started;
 }
 EXPORT_SYMBOL_GPL(ide_transfer_pc);
+
+ide_startstop_t ide_issue_pc(ide_drive_t *drive, struct ide_atapi_pc *pc,
+                             ide_handler_t *handler, unsigned int timeout,
+                             ide_expiry_t *expiry)
+{
+        ide_hwif_t *hwif = drive->hwif;
+        u16 bcount;
+        u8 dma = 0;
+
+        /* We haven't transferred any data yet */
+        pc->xferred = 0;
+        pc->cur_pos = pc->buf;
+
+        /* Request to transfer the entire buffer at once */
+        if (drive->media == ide_tape && !drive->scsi)
+                bcount = pc->req_xfer;
+        else
+                bcount = min(pc->req_xfer, 63 * 1024);
+
+        if (pc->flags & PC_FLAG_DMA_ERROR) {
+                pc->flags &= ~PC_FLAG_DMA_ERROR;
+                ide_dma_off(drive);
+        }
+
+        if ((pc->flags & PC_FLAG_DMA_OK) && drive->using_dma) {
+                if (drive->scsi)
+                        hwif->sg_mapped = 1;
+                dma = !hwif->dma_ops->dma_setup(drive);
+                if (drive->scsi)
+                        hwif->sg_mapped = 0;
+        }
+
+        if (!dma)
+                pc->flags &= ~PC_FLAG_DMA_OK;
+
+        ide_pktcmd_tf_load(drive, drive->scsi ? 0 : IDE_TFLAG_OUT_DEVICE,
+                           bcount, dma);
+
+        /* Issue the packet command */
+        if (pc->flags & PC_FLAG_DRQ_INTERRUPT) {
+                ide_execute_command(drive, WIN_PACKETCMD, handler,
+                                    timeout, NULL);
+                return ide_started;
+        } else {
+                ide_execute_pkt_cmd(drive);
+                return (*handler)(drive);
+        }
+}
+EXPORT_SYMBOL_GPL(ide_issue_pc);