linux-kernel - Re: [PATCH 01/28] dmaengine: use DMA_COMPLETE for dma completion status

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Message-ID: <20131017020745.GA14013@intel.com>
Date:	Thu, 17 Oct 2013 07:37:45 +0530
From:	Vinod Koul <vinod.koul@...el.com>
To:	Dan Williams <dan.j.williams@...el.com>
Cc:	Guennadi Liakhovetski <g.liakhovetski@....de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-arm-kernel@...ts.infradead.org, linux@....linux.org.uk
Subject: Re: [PATCH 01/28] dmaengine: use DMA_COMPLETE for dma completion
 status

On Wed, Oct 16, 2013 at 11:45:48AM -0700, Dan Williams wrote:
> On Wed, Oct 16, 2013 at 11:29 AM, Guennadi Liakhovetski
> >
> > Doesn't this break kernel compilation for a total of 27 commits? Or am I
> > missing anything?
> 
> Yes, I think at the start DMA_COMPLETE should just be a alias for
> DMA_SUCCESS, then after all the driver renames are in delete
> DMA_SUCCESS.
Oops, taht was bad of me. ffixes in v2 and sending patch 29 for removal case

--

>From 7768309422a1345d32857974fe8b57805adfd561 Mon Sep 17 00:00:00 2001
From: Vinod Koul <vinod.koul@...el.com>
Date: Wed, 16 Oct 2013 13:29:02 +0530
Subject: [PATCH] dmaengine: use DMA_COMPLETE for dma completion status

the DMA_SUCCESS is a misnomer as dmaengine indicates the transfer is complete and
gives no guarantee of the transfer success. Hence we should use DMA_COMPLTE
instead of DMA_SUCCESS

Signed-off-by: Vinod Koul <vinod.koul@...el.com>
---
 drivers/dma/dmaengine.c   |    2 +-
 include/linux/dmaengine.h |   13 +++++++------
 2 files changed, 8 insertions(+), 7 deletions(-)

diff --git a/drivers/dma/dmaengine.c b/drivers/dma/dmaengine.c
index 9162ac8..81d8765 100644
--- a/drivers/dma/dmaengine.c
+++ b/drivers/dma/dmaengine.c
@@ -1062,7 +1062,7 @@ dma_wait_for_async_tx(struct dma_async_tx_descriptor *tx)
 	unsigned long dma_sync_wait_timeout = jiffies + msecs_to_jiffies(5000);
 
 	if (!tx)
-		return DMA_SUCCESS;
+		return DMA_COMPLETE;
 
 	while (tx->cookie == -EBUSY) {
 		if (time_after_eq(jiffies, dma_sync_wait_timeout)) {
diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h
index 0bc7275..683c380 100644
--- a/include/linux/dmaengine.h
+++ b/include/linux/dmaengine.h
@@ -45,16 +45,17 @@ static inline int dma_submit_error(dma_cookie_t cookie)
 
 /**
  * enum dma_status - DMA transaction status
- * @DMA_SUCCESS: transaction completed successfully
+ * @DMA_COMPLETE: transaction completed
  * @DMA_IN_PROGRESS: transaction not yet processed
  * @DMA_PAUSED: transaction is paused
  * @DMA_ERROR: transaction failed
  */
 enum dma_status {
-	DMA_SUCCESS,
+	DMA_COMPLETE,
 	DMA_IN_PROGRESS,
 	DMA_PAUSED,
 	DMA_ERROR,
+	DMA_SUCCESS,
 };
 
 /**
@@ -979,10 +980,10 @@ static inline enum dma_status dma_async_is_complete(dma_cookie_t cookie,
 {
 	if (last_complete <= last_used) {
 		if ((cookie <= last_complete) || (cookie > last_used))
-			return DMA_SUCCESS;
+			return DMA_COMPLETE;
 	} else {
 		if ((cookie <= last_complete) && (cookie > last_used))
-			return DMA_SUCCESS;
+			return DMA_COMPLETE;
 	}
 	return DMA_IN_PROGRESS;
 }
@@ -1013,11 +1014,11 @@ static inline struct dma_chan *dma_find_channel(enum dma_transaction_type tx_typ
 }
 static inline enum dma_status dma_sync_wait(struct dma_chan *chan, dma_cookie_t cookie)
 {
-	return DMA_SUCCESS;
+	return DMA_COMPLETE;
 }
 static inline enum dma_status dma_wait_for_async_tx(struct dma_async_tx_descriptor *tx)
 {
-	return DMA_SUCCESS;
+	return DMA_COMPLETE;
 }
 static inline void dma_issue_pending_all(void)
 {
-- 
1.7.0.4

-- 
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