linux-kernel - [PATCH 4/7] dmaengine: sprd: Add device validation to support multiple controllers

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Date:   Mon, 15 Apr 2019 20:14:58 +0800
From:   Baolin Wang <baolin.wang@...aro.org>
To:     dan.j.williams@...el.com, vkoul@...nel.org
Cc:     eric.long@...soc.com, orsonzhai@...il.com, zhang.lyra@...il.com,
        broonie@...nel.org, baolin.wang@...aro.org,
        dmaengine@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 4/7] dmaengine: sprd: Add device validation to support multiple controllers

From: Eric Long <eric.long@...soc.com>

Since we can support multiple DMA engine controllers, we should add
device validation in filter function to check if the correct controller
to be requested.

Signed-off-by: Eric Long <eric.long@...soc.com>
Signed-off-by: Baolin Wang <baolin.wang@...aro.org>
---
 drivers/dma/sprd-dma.c |    5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/dma/sprd-dma.c b/drivers/dma/sprd-dma.c
index 0f92e60..9f99d4b 100644
--- a/drivers/dma/sprd-dma.c
+++ b/drivers/dma/sprd-dma.c
@@ -1020,8 +1020,13 @@ static void sprd_dma_free_desc(struct virt_dma_desc *vd)
 static bool sprd_dma_filter_fn(struct dma_chan *chan, void *param)
 {
 	struct sprd_dma_chn *schan = to_sprd_dma_chan(chan);
+	struct of_phandle_args *dma_spec =
+		container_of(param, struct of_phandle_args, args[0]);
 	u32 slave_id = *(u32 *)param;
 
+	if (chan->device->dev->of_node != dma_spec->np)
+		return false;
+
 	schan->dev_id = slave_id;
 	return true;
 }
-- 
1.7.9.5