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.khoronz...@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.
>
> > + 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
--
Regards,
Ivan Khoronzhuk
