[PATCH ide-dev-2.6] ide: ide_dma_intr oops fix

[Tejun Heo <htejun@gmail.com>]

 Hello, Bartlomiej.

 This patch fixes ide_dma_intr() oops which occurs for TASKFILE ioctl
using DMA dataphses.  This is against the latest ide-dev-2.6 tree +
all your recent 9 patches.

 Signed-off-by: Tejun Heo <htejun@gmail.com>

Index: linux-taskfile-ng/drivers/ide/ide-dma.c
===================================================================
--- linux-taskfile-ng.orig/drivers/ide/ide-dma.c	2005-03-03 11:59:16.485582413 +0900
+++ linux-taskfile-ng/drivers/ide/ide-dma.c	2005-03-03 12:00:07.753376048 +0900
@@ -175,10 +175,14 @@ ide_startstop_t ide_dma_intr (ide_drive_
 	if (OK_STAT(stat,DRIVE_READY,drive->bad_wstat|DRQ_STAT)) {
 		if (!dma_stat) {
 			struct request *rq = HWGROUP(drive)->rq;
-			ide_driver_t *drv;
 
-			drv = *(ide_driver_t **)rq->rq_disk->private_data;;
-			drv->end_request(drive, 1, rq->nr_sectors);
+			if (rq->rq_disk) {
+				ide_driver_t *drv;
+
+				drv = *(ide_driver_t **)rq->rq_disk->private_data;;
+				drv->end_request(drive, 1, rq->nr_sectors);
+			} else
+				ide_end_request(drive, 1, rq->nr_sectors);
 			return ide_stopped;
 		}
 		printk(KERN_ERR "%s: dma_intr: bad DMA status (dma_stat=%x)\n",