Hello, On Tue, Sep 03, 2024 at 06:46:48PM +0800, Li Zetao wrote: > 在 2024/9/3 16:09, Uwe Kleine-König 写道: > > On Sat, Aug 31, 2024 at 10:13:27AM +0800, Li Zetao wrote: > > > Use devm_clk_get_enabled() instead of devm_clk_get() + > > > clk_prepare_enable(), which can make the clk consistent with the device > > > life cycle and reduce the risk of unreleased clk resources. Since the > > > device framework has automatically released the clk resource, there is > > > no need to execute clk_disable_unprepare(clk) on the error path, drop > > > the cleanup_clk label, and the original error process can return directly. > > > > > > Signed-off-by: Li Zetao <lizetao1@xxxxxxxxxx> > > > --- > > > drivers/net/ethernet/faraday/ftgmac100.c | 27 ++++++------------------ > > > 1 file changed, 7 insertions(+), 20 deletions(-) > > > > > > diff --git a/drivers/net/ethernet/faraday/ftgmac100.c b/drivers/net/ethernet/faraday/ftgmac100.c > > > index 4c546c3aef0f..eb57c822c5ac 100644 > > > --- a/drivers/net/ethernet/faraday/ftgmac100.c > > > +++ b/drivers/net/ethernet/faraday/ftgmac100.c > > > @@ -1752,13 +1752,10 @@ static int ftgmac100_setup_clk(struct ftgmac100 *priv) > > > struct clk *clk; > > > int rc; > > > - clk = devm_clk_get(priv->dev, NULL /* MACCLK */); > > > + clk = devm_clk_get_enabled(priv->dev, NULL /* MACCLK */); > > > if (IS_ERR(clk)) > > > return PTR_ERR(clk); > > > priv->clk = clk; > > > - rc = clk_prepare_enable(priv->clk); > > > - if (rc) > > > - return rc; > > > /* Aspeed specifies a 100MHz clock is required for up to > > > * 1000Mbit link speeds. As NCSI is limited to 100Mbit, 25MHz > > > @@ -1767,21 +1764,17 @@ static int ftgmac100_setup_clk(struct ftgmac100 *priv) > > > rc = clk_set_rate(priv->clk, priv->use_ncsi ? FTGMAC_25MHZ : > > > FTGMAC_100MHZ); > > > if (rc) > > > - goto cleanup_clk; > > > + return rc; > > > /* RCLK is for RMII, typically used for NCSI. Optional because it's not > > > * necessary if it's the AST2400 MAC, or the MAC is configured for > > > * RGMII, or the controller is not an ASPEED-based controller. > > > */ > > > - priv->rclk = devm_clk_get_optional(priv->dev, "RCLK"); > > > - rc = clk_prepare_enable(priv->rclk); > > > - if (!rc) > > > - return 0; > > > + priv->rclk = devm_clk_get_optional_enabled(priv->dev, "RCLK"); > > > + if (IS_ERR(priv->rclk)) > > > + return PTR_ERR(priv->rclk); > > > -cleanup_clk: > > > - clk_disable_unprepare(priv->clk); > > > - > > > - return rc; > > > + return 0; > > > > You're changing semantics here. Before your patch ftgmac100_setup_clk() > > was left with priv->clk disabled; now you keep it enabled. > Before my patch, ftgmac100_setup_clk() was only left with priv->clk disabled > when error occurs, and was left with priv->clk enabled when no error occurs > because when enabling priv->rclk successfully, it will return 0 directly, > and when enabling priv->rclk failed, it will disable priv->clk. > > It turns out that the code logic is a bit counter-intuitive, but the > readability has been improved after adjustments. Indeed. This is IMHO worth mentioning in the commit log to prevent the next reviewer stumble over the same code construct. Best regards Uwe
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