linux-kernel - Re: [PATCH] dmatest: Simple DMA memcpy test client

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Date:	Tue, 1 Jul 2008 15:53:23 +0200
From:	Haavard Skinnemoen <haavard.skinnemoen@...el.com>
To:	"Sosnowski, Maciej" <maciej.sosnowski@...el.com>
Cc:	"Williams, Dan J" <dan.j.williams@...el.com>,
	"lkml" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] dmatest: Simple DMA memcpy test client

Subject: [PATCH] dmatest: Return DMA_NAK if nr_channels >= max_channels

"Sosnowski, Maciej" <maciej.sosnowski@...el.com> wrote:
> In case when nr_channels exceeds max_channels 
> ack should be rather set to DMA_NAK than DMA_DUP.

You're right. The below patch should take care of this.

Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@...el.com>
---
 drivers/dma/dmatest.c |   12 ++++++------
 1 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/dma/dmatest.c b/drivers/dma/dmatest.c
index 5c9fd10..a08d197 100644
--- a/drivers/dma/dmatest.c
+++ b/drivers/dma/dmatest.c
@@ -398,13 +398,13 @@ dmatest_event(struct dma_client *client, struct dma_chan *chan,
 
 	switch (state) {
 	case DMA_RESOURCE_AVAILABLE:
-		if (dmatest_match_channel(chan)
-				&& dmatest_match_device(chan->device)
-				&& (!max_channels
-					|| nr_channels < max_channels))
-			ack = dmatest_add_channel(chan);
-		else
+		if (!dmatest_match_channel(chan)
+				|| !dmatest_match_device(chan->device))
 			ack = DMA_DUP;
+		else if (max_channels && nr_channels >= max_channels)
+			ack = DMA_NAK;
+		else
+			ack = dmatest_add_channel(chan);
 		break;
 
 	case DMA_RESOURCE_REMOVED:
-- 
1.5.6

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