linux-kernel - RE: [PATCH v4] phy: renesas: rcar-gen3-usb2: Fix an error handling path in rcar_gen3_phy_usb2

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Message-ID:
 <TYCPR01MB113329930BA5E2149C9BE2A1986672@TYCPR01MB11332.jpnprd01.prod.outlook.com>
Date: Sun, 15 Sep 2024 15:23:13 +0000
From: Biju Das <biju.das.jz@...renesas.com>
To: Christophe JAILLET <christophe.jaillet@...adoo.fr>, Yoshihiro Shimoda
	<yoshihiro.shimoda.uh@...esas.com>, Vinod Koul <vkoul@...nel.org>, Kishon
 Vijay Abraham I <kishon@...nel.org>, Philipp Zabel <p.zabel@...gutronix.de>,
	Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
CC: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"kernel-janitors@...r.kernel.org" <kernel-janitors@...r.kernel.org>,
	"linux-renesas-soc@...r.kernel.org" <linux-renesas-soc@...r.kernel.org>,
	"linux-phy@...ts.infradead.org" <linux-phy@...ts.infradead.org>
Subject: RE: [PATCH v4] phy: renesas: rcar-gen3-usb2: Fix an error handling
 path in rcar_gen3_phy_usb2_probe()

Hi,

> -----Original Message-----
> From: Christophe JAILLET <christophe.jaillet@...adoo.fr>
> Sent: Saturday, September 14, 2024 6:03 PM
> Subject: [PATCH v4] phy: renesas: rcar-gen3-usb2: Fix an error handling path in
> rcar_gen3_phy_usb2_probe()
> 
> If an error occurs after the reset_control_deassert(),
> reset_control_assert() must be called, as already done in the remove function.
> 
> Use devm_add_action_or_reset() to add the missing call and simplify the
> .remove() function accordingly.
> 
> Fixes: 4eae16375357 ("phy: renesas: rcar-gen3-usb2: Add support to initialize the bus")
> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
> ---
> This patch changes the order of function calls when releasing the resources in the .remove function().
> Looks fine to me, but pm_ functions are sometimes tricky.
> 
> Changes in v4:
>   - Use the error handling path in rcar_gen3_phy_usb2_init_bus()
> 
> Changes in v3:
>   - Use devm_add_action_or_reset()   [Biju Das]
> v3:
> https://lore.kernel.org/all/290b25827e3f0742808940719455ff0c5cb9d01d.1726329925.git.christophe.jaillet
> @wanadoo.fr/
> 
> Changes in v2: (broken proposal)
>   - Re-use 'error' to simplify the patch   [claudiu beznea]
>   - Update the commit description to explain why it is safe.
> v2:
> https://lore.kernel.org/all/4efe2d0419cbe98163e2422ebe0c7896b8a5efed.1725717505.git.christophe.jaillet
> @wanadoo.fr/
> 
> v1:
> https://lore.kernel.org/all/fc9f7b444f0ca645411868992bbe16514aeccfed.1725652654.git.christophe.jaillet
> @wanadoo.fr/
> ---
>  drivers/phy/renesas/phy-rcar-gen3-usb2.c | 13 ++++++++++++-
>  1 file changed, 12 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/phy/renesas/phy-rcar-gen3-usb2.c b/drivers/phy/renesas/phy-rcar-gen3-usb2.c
> index 58e123305152..f900fe42c311 100644
> --- a/drivers/phy/renesas/phy-rcar-gen3-usb2.c
> +++ b/drivers/phy/renesas/phy-rcar-gen3-usb2.c
> @@ -668,6 +668,13 @@ static enum usb_dr_mode rcar_gen3_get_dr_mode(struct device_node *np)
>  	return candidate;
>  }
> 
> +static void rcar_gen3_reset_assert(void *data) {
> +	struct reset_control *rstc = data;

nit:
Maybe since it is void*, you could avoid this assignment and use data instead??

Reviewed-by: Biju Das <biju.das.jz@...renesas.com>

Cheers,
Biju
> +
> +	reset_control_assert(rstc);
> +}
> +
>  static int rcar_gen3_phy_usb2_init_bus(struct rcar_gen3_chan *channel)  {
>  	struct device *dev = channel->dev;
> @@ -686,6 +693,11 @@ static int rcar_gen3_phy_usb2_init_bus(struct rcar_gen3_chan *channel)
>  	if (ret)
>  		goto rpm_put;
> 
> +	ret = devm_add_action_or_reset(dev, rcar_gen3_reset_assert,
> +				       channel->rstc);
> +	if (ret)
> +		goto rpm_put;
> +
>  	val = readl(channel->base + USB2_AHB_BUS_CTR);
>  	val &= ~USB2_AHB_BUS_CTR_MBL_MASK;
>  	val |= USB2_AHB_BUS_CTR_MBL_INCR4;
> @@ -815,7 +827,6 @@ static void rcar_gen3_phy_usb2_remove(struct platform_device *pdev)
>  	if (channel->is_otg_channel)
>  		device_remove_file(&pdev->dev, &dev_attr_role);
> 
> -	reset_control_assert(channel->rstc);
>  	pm_runtime_disable(&pdev->dev);
>  };
> 
> --
> 2.46.0