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SubjectRe: [PATCH v2 net-next] net: ethernet: ti: cpdma: correct error handling for chan create
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On 12/12/2017 11:50 AM, Ivan Khoronzhuk wrote:
> On Tue, Dec 12, 2017 at 11:08:51AM -0600, Grygorii Strashko wrote:
>>
>>
>> On 12/12/2017 10:35 AM, Ivan Khoronzhuk wrote:
>>> 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
>>> duplicated 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 | 9 +++++++--
>>> 3 files changed, 17 insertions(+), 6 deletions(-)
>>>
>>> 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..3d4af64 100644
>>> --- a/drivers/net/ethernet/ti/davinci_emac.c
>>> +++ b/drivers/net/ethernet/ti/davinci_emac.c
>>> @@ -1870,10 +1870,15 @@ 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 (WARN_ON(IS_ERR(priv->txchan))) {
>>
>> So, logically WARN_ON() should be removed in davinci_emac.c also. Right?
> It doesn't have dev_err() duplicate, so not very.
> But would be better to replace them on dev_err() if no objection.
>

right.

>
>>
>>> + 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 (WARN_ON(IS_ERR(priv->rxchan))) {
>>> + rc = PTR_ERR(priv->rxchan);
>>> goto no_cpdma_chan;
>>> }

--
regards,
-grygorii

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