linux-kernel - [PATCH 05/18] DMAENGINE: ste_dma40: improve allocation error handling

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Date:	Tue, 1 Jun 2010 14:21:00 +0200
From:	Linus Walleij <linus.walleij@...ricsson.com>
To:	Dan Williams <dan.j.williams@...el.com>
Cc:	<linux-kernel@...r.kernel.org>,
	Jonas Aaberg <jonas.aberg@...ricsson.com>,
	Linus Walleij <linus.walleij@...ricsson.com>
Subject: [PATCH 05/18] DMAENGINE: ste_dma40: improve allocation error handling

From: Jonas Aaberg <jonas.aberg@...ricsson.com>

Better error handling when channel allocation fails.

Signed-off-by: Jonas Aaberg <jonas.aberg@...ricsson.com>
Signed-off-by: Linus Walleij <linus.walleij@...ricsson.com>
---
 drivers/dma/ste_dma40.c |   25 ++++++++++---------------
 1 files changed, 10 insertions(+), 15 deletions(-)

diff --git a/drivers/dma/ste_dma40.c b/drivers/dma/ste_dma40.c
index d952201..0ca6508 100644
--- a/drivers/dma/ste_dma40.c
+++ b/drivers/dma/ste_dma40.c
@@ -1269,7 +1269,7 @@ static int d40_free_dma(struct d40_chan *d40c)
 
 	res = d40_channel_execute_command(d40c, D40_DMA_SUSPEND_REQ);
 	if (res) {
-		dev_err(&d40c->chan.dev->device, "[%s] suspend\n",
+		dev_err(&d40c->chan.dev->device, "[%s] suspend failed\n",
 			__func__);
 		return res;
 	}
@@ -1687,8 +1687,12 @@ static int d40_alloc_chan_resources(struct dma_chan *chan)
 	 */
 	if (d40c->dma_cfg.channel_type == 0) {
 		err = d40_config_memcpy(d40c);
-		if (err)
-			goto err_alloc;
+		if (err) {
+			dev_err(&d40c->chan.dev->device,
+				"[%s] Failed to configure memcpy channel\n",
+				__func__);
+			goto fail;
+		}
 	}
 	is_free_phy = (d40c->phy_chan == NULL);
 
@@ -1696,7 +1700,7 @@ static int d40_alloc_chan_resources(struct dma_chan *chan)
 	if (err) {
 		dev_err(&d40c->chan.dev->device,
 			"[%s] Failed to allocate channel\n", __func__);
-		goto err_alloc;
+		goto fail;
 	}
 
 	err = d40_config_chan(d40c, &d40c->dma_cfg, is_free_phy);
@@ -1704,19 +1708,10 @@ static int d40_alloc_chan_resources(struct dma_chan *chan)
 		dev_err(&d40c->chan.dev->device,
 			"[%s] Failed to configure channel\n",
 			__func__);
-		goto err_config;
 	}
-
-	spin_unlock_irqrestore(&d40c->lock, flags);
-	return 0;
-
- err_config:
-	(void) d40_free_dma(d40c);
- err_alloc:
+fail:
 	spin_unlock_irqrestore(&d40c->lock, flags);
-	dev_err(&d40c->chan.dev->device,
-		"[%s] Channel allocation failed\n", __func__);
-	return -EINVAL;
+	return err;
 }
 
 static void d40_free_chan_resources(struct dma_chan *chan)
-- 
1.6.3.3

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