[v3,net-next] net: ethernet: ti: cpdma: correct error handling for chan create

Message ID 1513112795-20045-1-git-send-email-ivan.khoronzhuk@linaro.org
State New
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Series
  • [v3,net-next] net: ethernet: ti: cpdma: correct error handling for chan create
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Commit Message

Ivan Khoronzhuk Dec. 12, 2017, 9:06 p.m.
It's not correct to return NULL when that is actually an error and
function returns errors in any other wrong case. In the same time,
the cpsw driver and davinci emac doesn't check error case while
creating channel and it can miss actual error. Also remove WARNs
replacing them on dev_err msgs.

Signed-off-by: Ivan Khoronzhuk <ivan.khoronzhuk@linaro.org>

---
 drivers/net/ethernet/ti/cpsw.c          | 12 +++++++++---
 drivers/net/ethernet/ti/davinci_cpdma.c |  2 +-
 drivers/net/ethernet/ti/davinci_emac.c  | 11 +++++++++--
 3 files changed, 19 insertions(+), 6 deletions(-)

-- 
2.7.4

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Comments

David Miller Dec. 13, 2017, 8:51 p.m. | #1
From: Ivan Khoronzhuk <ivan.khoronzhuk@linaro.org>

Date: Tue, 12 Dec 2017 23:06:35 +0200

> It's not correct to return NULL when that is actually an error and

> function returns errors in any other wrong case. In the same time,

> the cpsw driver and davinci emac doesn't check error case while

> creating channel and it can miss actual error. Also remove WARNs

> replacing them on dev_err msgs.

> 

> Signed-off-by: Ivan Khoronzhuk <ivan.khoronzhuk@linaro.org>


Applied.
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Patch

diff --git a/drivers/net/ethernet/ti/cpsw.c b/drivers/net/ethernet/ti/cpsw.c
index a60a378..3c85a08 100644
--- a/drivers/net/ethernet/ti/cpsw.c
+++ b/drivers/net/ethernet/ti/cpsw.c
@@ -3065,10 +3065,16 @@  static int cpsw_probe(struct platform_device *pdev)
 	}
 
 	cpsw->txv[0].ch = cpdma_chan_create(cpsw->dma, 0, cpsw_tx_handler, 0);
+	if (IS_ERR(cpsw->txv[0].ch)) {
+		dev_err(priv->dev, "error initializing tx dma channel\n");
+		ret = PTR_ERR(cpsw->txv[0].ch);
+		goto clean_dma_ret;
+	}
+
 	cpsw->rxv[0].ch = cpdma_chan_create(cpsw->dma, 0, cpsw_rx_handler, 1);
-	if (WARN_ON(!cpsw->rxv[0].ch || !cpsw->txv[0].ch)) {
-		dev_err(priv->dev, "error initializing dma channels\n");
-		ret = -ENOMEM;
+	if (IS_ERR(cpsw->rxv[0].ch)) {
+		dev_err(priv->dev, "error initializing rx dma channel\n");
+		ret = PTR_ERR(cpsw->rxv[0].ch);
 		goto clean_dma_ret;
 	}
 
diff --git a/drivers/net/ethernet/ti/davinci_cpdma.c b/drivers/net/ethernet/ti/davinci_cpdma.c
index e4d6edf..6f9173f 100644
--- a/drivers/net/ethernet/ti/davinci_cpdma.c
+++ b/drivers/net/ethernet/ti/davinci_cpdma.c
@@ -893,7 +893,7 @@  struct cpdma_chan *cpdma_chan_create(struct cpdma_ctlr *ctlr, int chan_num,
 	chan_num = rx_type ? rx_chan_num(chan_num) : tx_chan_num(chan_num);
 
 	if (__chan_linear(chan_num) >= ctlr->num_chan)
-		return NULL;
+		return ERR_PTR(-EINVAL);
 
 	chan = devm_kzalloc(ctlr->dev, sizeof(*chan), GFP_KERNEL);
 	if (!chan)
diff --git a/drivers/net/ethernet/ti/davinci_emac.c b/drivers/net/ethernet/ti/davinci_emac.c
index f58c0c6..abceea8 100644
--- a/drivers/net/ethernet/ti/davinci_emac.c
+++ b/drivers/net/ethernet/ti/davinci_emac.c
@@ -1870,10 +1870,17 @@  static int davinci_emac_probe(struct platform_device *pdev)
 
 	priv->txchan = cpdma_chan_create(priv->dma, EMAC_DEF_TX_CH,
 					 emac_tx_handler, 0);
+	if (IS_ERR(priv->txchan)) {
+		dev_err(&pdev->dev, "error initializing tx dma channel\n");
+		rc = PTR_ERR(priv->txchan);
+		goto no_cpdma_chan;
+	}
+
 	priv->rxchan = cpdma_chan_create(priv->dma, EMAC_DEF_RX_CH,
 					 emac_rx_handler, 1);
-	if (WARN_ON(!priv->txchan || !priv->rxchan)) {
-		rc = -ENOMEM;
+	if (IS_ERR(priv->rxchan)) {
+		dev_err(&pdev->dev, "error initializing rx dma channel\n");
+		rc = PTR_ERR(priv->rxchan);
 		goto no_cpdma_chan;
 	}