[media] v4l2: bfin: Ensure delete and reinit list entry on NOMMU arch…

…itecture

On NOMMU architecture page fault is not triggered if a deleted list entry is
accessed without reinit.

Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
Acked-by: Scott Jiang <scott.jiang.linux@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

drivers/media/platform/blackfin/bfin_capture.c

@@ -446,7 +446,7 @@ static void bcap_stop_streaming(struct vb2_queue *vq)
 	while (!list_empty(&bcap_dev->dma_queue)) {
 		bcap_dev->cur_frm = list_entry(bcap_dev->dma_queue.next,
 						struct bcap_buffer, list);
-		list_del(&bcap_dev->cur_frm->list);
+		list_del_init(&bcap_dev->cur_frm->list);
 		vb2_buffer_done(&bcap_dev->cur_frm->vb, VB2_BUF_STATE_ERROR);
 	}
 }
@@ -533,7 +533,7 @@ static irqreturn_t bcap_isr(int irq, void *dev_id)
 		}
 		bcap_dev->cur_frm = list_entry(bcap_dev->dma_queue.next,
 				struct bcap_buffer, list);
-		list_del(&bcap_dev->cur_frm->list);
+		list_del_init(&bcap_dev->cur_frm->list);
 	} else {
 		/* clear error flag, we will get a new frame */
 		if (ppi->err)
@@ -583,7 +583,7 @@ static int bcap_streamon(struct file *file, void *priv,
 	bcap_dev->cur_frm = list_entry(bcap_dev->dma_queue.next,
 					struct bcap_buffer, list);
 	/* remove buffer from the dma queue */
-	list_del(&bcap_dev->cur_frm->list);
+	list_del_init(&bcap_dev->cur_frm->list);
 	addr = vb2_dma_contig_plane_dma_addr(&bcap_dev->cur_frm->vb, 0);
 	/* update DMA address */
 	ppi->ops->update_addr(ppi, (unsigned long)addr);