netdev - Re: [PATCHv2 net-next] net: modernize ioremap in probe

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Message-ID: <20241114110745.h6luzb72zkahyr5j@DEN-DL-M31836.microchip.com>
Date: Thu, 14 Nov 2024 12:07:45 +0100
From: Horatiu Vultur <horatiu.vultur@...rochip.com>
To: Rosen Penev <rosenp@...il.com>
CC: <netdev@...r.kernel.org>, Chandrasekar Ramakrishnan <rcsekar@...sung.com>,
	Marc Kleine-Budde <mkl@...gutronix.de>, Vincent Mailhol
	<mailhol.vincent@...adoo.fr>, Andrew Lunn <andrew+netdev@...n.ch>, "David S.
 Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, "Jakub
 Kicinski" <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, Kurt Kanzenbach
	<kurt@...utronix.de>, Vladimir Oltean <olteanv@...il.com>, Chris Snook
	<chris.snook@...il.com>, Marcin Wojtas <marcin.s.wojtas@...il.com>, "Russell
 King" <linux@...linux.org.uk>, "maintainer:MICROCHIP LAN966X ETHERNET DRIVER"
	<UNGLinuxDriver@...rochip.com>, Yoshihiro Shimoda
	<yoshihiro.shimoda.uh@...esas.com>, Niklas Söderlund
	<niklas.soderlund@...natech.se>, Doug Berger <opendmb@...il.com>, "Florian
 Fainelli" <florian.fainelli@...adcom.com>, "Broadcom internal kernel review
 list" <bcm-kernel-feedback-list@...adcom.com>, Heiner Kallweit
	<hkallweit1@...il.com>, Richard Cochran <richardcochran@...il.com>, "open
 list:MCAN MMIO DEVICE DRIVER" <linux-can@...r.kernel.org>, open list
	<linux-kernel@...r.kernel.org>, "open list:RENESAS ETHERNET SWITCH DRIVER"
	<linux-renesas-soc@...r.kernel.org>
Subject: Re: [PATCHv2 net-next] net: modernize ioremap in probe

The 11/11/2024 12:02, Rosen Penev wrote:

Hi Rosen,

> diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_main.c b/drivers/net/ethernet/microchip/lan966x/lan966x_main.c
> index 3234a960fcc3..375e9a68b9a9 100644
> --- a/drivers/net/ethernet/microchip/lan966x/lan966x_main.c
> +++ b/drivers/net/ethernet/microchip/lan966x/lan966x_main.c
> @@ -77,20 +77,12 @@ static int lan966x_create_targets(struct platform_device *pdev,
>          * this.
>          */
>         for (idx = 0; idx < IO_RANGES; idx++) {
> -               iores[idx] = platform_get_resource(pdev, IORESOURCE_MEM,
> -                                                  idx);
> -               if (!iores[idx]) {
> -                       dev_err(&pdev->dev, "Invalid resource\n");
> -                       return -EINVAL;
> -               }
> -
> -               begin[idx] = devm_ioremap(&pdev->dev,
> -                                         iores[idx]->start,
> -                                         resource_size(iores[idx]));
> -               if (!begin[idx]) {
> +               begin[idx] = devm_platform_get_and_ioremap_resource(
> +                       pdev, idx, &iores[idx]);
> +               if (IS_ERR(begin[idx])) {
>                         dev_err(&pdev->dev, "Unable to get registers: %s\n",
>                                 iores[idx]->name);
> -                       return -ENOMEM;
> +                       return PTR_ERR(begin[idx]);
>                 }
>         }
> 

Unfortunately, this breaks the lan966x probe. With this change I get the
following errors:
[    1.705315] lan966x-switch e0000000.switch: can't request region for resource [mem 0xe0000000-0xe00fffff]
[    1.714911] lan966x-switch e0000000.switch: Unable to get registers: cpu
[    1.721607] lan966x-switch e0000000.switch: error -EBUSY: Failed to create targets
[    1.729173] lan966x-switch: probe of e0000000.switch failed with error -16

-- 
/Horatiu