add REDIRECT

hc

2024-10-09 05e59e5fb0064c97a1c10921ecd549f2d4a58565

 kernel/drivers/dma/dw-edma/dw-edma-core.c
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@@ -166,7 +166,7 @@
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 	dw_edma_free_desc(vd2dw_edma_desc(vdesc));
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 }
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-static void dw_edma_start_transfer(struct dw_edma_chan *chan)
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+static int dw_edma_start_transfer(struct dw_edma_chan *chan)
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 {
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 	struct dw_edma_chunk *child;
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 	struct dw_edma_desc *desc;
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@@ -174,16 +174,16 @@
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 	vd = vchan_next_desc(&chan->vc);
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 	if (!vd)
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-		return;
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+		return 0;
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 	desc = vd2dw_edma_desc(vd);
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 	if (!desc)
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-		return;
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+		return 0;
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 	child = list_first_entry_or_null(&desc->chunk->list,
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 					 struct dw_edma_chunk, list);
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 	if (!child)
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-		return;
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+		return 0;
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 	dw_edma_v0_core_start(child, !desc->xfer_sz);
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 	desc->xfer_sz += child->ll_region.sz;
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@@ -191,6 +191,8 @@
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 	list_del(&child->list);
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 	kfree(child);
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 	desc->chunks_alloc--;
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+
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+	return 1;
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 }
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 static int dw_edma_device_config(struct dma_chan *dchan,
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@@ -274,9 +276,12 @@
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 	struct dw_edma_chan *chan = dchan2dw_edma_chan(dchan);
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 	unsigned long flags;
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+	if (!chan->configured)
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+		return;
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+
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 	spin_lock_irqsave(&chan->vc.lock, flags);
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-	if (chan->configured && chan->request == EDMA_REQ_NONE &&
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-	    chan->status == EDMA_ST_IDLE && vchan_issue_pending(&chan->vc)) {
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+	if (vchan_issue_pending(&chan->vc) && chan->request == EDMA_REQ_NONE &&
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+	    chan->status == EDMA_ST_IDLE) {
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 		chan->status = EDMA_ST_BUSY;
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 		dw_edma_start_transfer(chan);
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 	}
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@@ -497,14 +502,14 @@
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 		switch (chan->request) {
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 		case EDMA_REQ_NONE:
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 			desc = vd2dw_edma_desc(vd);
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-			if (desc->chunks_alloc) {
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-				chan->status = EDMA_ST_BUSY;
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-				dw_edma_start_transfer(chan);
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-			} else {
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+			if (!desc->chunks_alloc) {
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 				list_del(&vd->node);
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 				vchan_cookie_complete(vd);
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-				chan->status = EDMA_ST_IDLE;
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 			}
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+
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+			/* Continue transferring if there are remaining chunks or issued requests.
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+			 */
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+			chan->status = dw_edma_start_transfer(chan) ? EDMA_ST_BUSY : EDMA_ST_IDLE;
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 			break;
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 		case EDMA_REQ_STOP: