linux-kernel - [PATCH 3/3] dmaengine: Encourage dma_request_slave_channel

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Message-ID: <20200203101806.2441-4-peter.ujfalusi@ti.com>
Date:   Mon, 3 Feb 2020 12:18:06 +0200
From:   Peter Ujfalusi <peter.ujfalusi@...com>
To:     <vkoul@...nel.org>
CC:     <dmaengine@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <dan.j.williams@...el.com>
Subject: [PATCH 3/3] dmaengine: Encourage dma_request_slave_channel_compat() users to migrate

Users of dma_request_slave_channel_compat() can be migrated to
dma_request_chan() by correct dma_slave_map for the platform.

Start nagging users in hope that they will move.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@...com>
---
 include/linux/dmaengine.h | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h
index 4c522bf6ac25..581f6822a7a5 100644
--- a/include/linux/dmaengine.h
+++ b/include/linux/dmaengine.h
@@ -1547,6 +1547,10 @@ dma_request_slave_channel(struct device *dev, const char *name)
 	return IS_ERR(ch) ? NULL : ch;
 }
 
+/*
+ * Please use dma_request_chan() directly.
+ * Legacy support should use dma_slave_map + dma_request_chan()
+ */
 static inline struct dma_chan
 *dma_request_slave_channel_compat(const dma_cap_mask_t mask,
 				  dma_filter_fn fn, void *fn_param,
@@ -1554,13 +1558,16 @@ static inline struct dma_chan
 {
 	struct dma_chan *chan;
 
-	chan = dma_request_slave_channel(dev, name);
-	if (chan)
+	chan = dma_request_chan(dev, name);
+	if (!IS_ERR(chan))
 		return chan;
 
 	if (!fn || !fn_param)
 		return NULL;
 
+	dev_info(dev, "Please add dma_slave_map entry for %s:%s and migrate to"
+		 " dma_request_chan()", dev_name(dev), name);
+
 	return __dma_request_channel(&mask, fn, fn_param, NULL);
 }
 
-- 
Peter

Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
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