linux-kernel - Re: [PATCH v2 2/3] phy: phy-rockchip-inno-usb2: Handle failed extcon allocation better

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Message-ID: <816aa82c-1f50-4dfe-a41f-e396e0bdf219@wanadoo.fr>
Date: Wed, 21 Aug 2024 13:17:23 +0200
From: Christophe JAILLET <christophe.jaillet@...adoo.fr>
To: Dragan Simic <dsimic@...jaro.org>, linux-rockchip@...ts.infradead.org,
 linux-phy@...ts.infradead.org
Cc: vkoul@...nel.org, kishon@...nel.org, heiko@...ech.de,
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/3] phy: phy-rockchip-inno-usb2: Handle failed extcon
 allocation better

Le 21/08/2024 à 09:37, Dragan Simic a écrit :
> Return the actual error code upon failure to allocate extcon device, instead
> of hardcoding -ENOMEM.  Use dev_err_probe() to also log appropriate messages,
> which is fine because the containing function is used in the probe path.
> 
> Helped-by: Heiko Stubner <heiko@...ech.de>
> Signed-off-by: Dragan Simic <dsimic@...jaro.org>
> ---
>   drivers/phy/rockchip/phy-rockchip-inno-usb2.c | 3 ++-
>   1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/phy/rockchip/phy-rockchip-inno-usb2.c b/drivers/phy/rockchip/phy-rockchip-inno-usb2.c
> index 113bfc717ff0..05af46dda11d 100644
> --- a/drivers/phy/rockchip/phy-rockchip-inno-usb2.c
> +++ b/drivers/phy/rockchip/phy-rockchip-inno-usb2.c
> @@ -435,7 +435,8 @@ static int rockchip_usb2phy_extcon_register(struct rockchip_usb2phy *rphy)
>   						rockchip_usb2phy_extcon_cable);
>   
>   		if (IS_ERR(edev))
> -			return -ENOMEM;
> +			return dev_err_probe(rphy->dev, PTR_ERR(edev),
> +					     "failed to allocate extcon device\n");

Returning PTR_ERR(edev) may make sense, but I don't think that adding a 
dev_err_probe() really helps.

devm_extcon_dev_allocate() can only return -EINVAL if it 2nd argument is 
NULL. It is trivial to see that it can't happen here, 
rockchip_usb2phy_extcon_cable is a global variable.

in all other cases, it returns -ENOMEM because of a failed memory 
allocation. In this case, usually it is not needed to log anything 
because it is already loud enough.

Just my 2c.

CJ


>   
>   		ret = devm_extcon_dev_register(rphy->dev, edev);
>   		if (ret) {
> 
>