linux-kernel - Re: [PATCH v8 2/2] can: esd: add support for esd GmbH PCIe/402 CAN interface family

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Date:   Fri, 3 Nov 2023 16:48:39 +0000
From:   Simon Horman <horms@...nel.org>
To:     Stefan Mätje <stefan.maetje@....eu>
Cc:     Marc Kleine-Budde <mkl@...gutronix.de>, linux-can@...r.kernel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Wolfgang Grandegger <wg@...ndegger.com>,
        "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
Subject: Re: [PATCH v8 2/2] can: esd: add support for esd GmbH PCIe/402 CAN
 interface family

On Wed, Oct 25, 2023 at 04:16:35PM +0200, Stefan Mätje wrote:
> This patch adds support for the PCI based PCIe/402 CAN interface family
> from esd GmbH that is available with various form factors
> (https://esd.eu/en/products/402-series-can-interfaces).
> 
> All boards utilize a FPGA based CAN controller solution developed
> by esd (esdACC). For more information on the esdACC see
> https://esd.eu/en/products/esdacc.
> 
> This driver detects all available CAN interface board variants of
> the family but atm. operates the CAN-FD capable devices in
> Classic-CAN mode only! A later patch will introduce the CAN-FD
> functionality in this driver.
> 
> Co-developed-by: Thomas Körper <thomas.koerper@....eu>
> Signed-off-by: Thomas Körper <thomas.koerper@....eu>
> Signed-off-by: Stefan Mätje <stefan.maetje@....eu>

...

> +static int pci402_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
> +{
> +	struct pci402_card *card = NULL;
> +	int err;
> +
> +	err = pci_enable_device(pdev);
> +	if (err)
> +		return err;
> +
> +	card = devm_kzalloc(&pdev->dev, sizeof(*card), GFP_KERNEL);
> +	if (!card)

Hi Thomas and Stefan,

If this condition is met then the function will return err,
but err is set to 0. Perhaps it should be set to an error value here?

Flagged by Smatch.

> +		goto failure_disable_pci;
> +
> +	pci_set_drvdata(pdev, card);
> +
> +	err = pci_request_regions(pdev, pci_name(pdev));
> +	if (err)
> +		goto failure_disable_pci;
> +
> +	card->addr = pci_iomap(pdev, PCI402_BAR, PCI402_IO_LEN_TOTAL);
> +	if (!card->addr) {
> +		err = -ENOMEM;
> +		goto failure_release_regions;
> +	}
> +
> +	err = pci402_init_card(pdev);
> +	if (err)
> +		goto failure_unmap;
> +
> +	err = pci402_init_dma(pdev);
> +	if (err)
> +		goto failure_unmap;
> +
> +	err = pci402_init_interrupt(pdev);
> +	if (err)
> +		goto failure_finish_dma;
> +
> +	err = pci402_init_cores(pdev);
> +	if (err)
> +		goto failure_finish_interrupt;
> +
> +	return 0;
> +
> +failure_finish_interrupt:
> +	pci402_finish_interrupt(pdev);
> +
> +failure_finish_dma:
> +	pci402_finish_dma(pdev);
> +
> +failure_unmap:
> +	pci_iounmap(pdev, card->addr);
> +
> +failure_release_regions:
> +	pci_release_regions(pdev);
> +
> +failure_disable_pci:
> +	pci_disable_device(pdev);
> +
> +	return err;
> +}

...