linux-kernel - [PATCH v5 17/24] dmaengine: edma: Print warning when linking slots from different eDMA

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Date:	Wed, 14 Oct 2015 14:42:59 +0300
From:	Peter Ujfalusi <peter.ujfalusi@...com>
To:	<vinod.koul@...el.com>, <nsekhar@...com>, <linux@....linux.org.uk>
CC:	<olof@...om.net>, <arnd@...db.de>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, <linux-omap@...r.kernel.org>,
	<dmaengine@...r.kernel.org>
Subject: [PATCH v5 17/24] dmaengine: edma: Print warning when linking slots from different eDMA

Warning message in case of linking between paRAM slots in different eDMA
controllers.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@...com>
---
 drivers/dma/edma.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/dma/edma.c b/drivers/dma/edma.c
index f6653da0ee16..d33ae0b43925 100644
--- a/drivers/dma/edma.c
+++ b/drivers/dma/edma.c
@@ -619,6 +619,9 @@ static void edma_free_slot(struct edma_cc *ecc, unsigned slot)
  */
 static void edma_link(struct edma_cc *ecc, unsigned from, unsigned to)
 {
+	if (unlikely(EDMA_CTLR(from) != EDMA_CTLR(to)))
+		dev_warn(ecc->dev, "Ignoring eDMA instance for linking\n");
+
 	from = EDMA_CHAN_SLOT(from);
 	to = EDMA_CHAN_SLOT(to);
 	if (from >= ecc->num_slots || to >= ecc->num_slots)
-- 
2.6.1

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