linux-kernel - Re: [PATCH] misc: alcor_pci: Fix an error handling path

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Message-ID: <20220207093618.GA18325@pengutronix.de>
Date:   Mon, 7 Feb 2022 10:36:18 +0100
From:   Oleksij Rempel <o.rempel@...gutronix.de>
To:     Christophe JAILLET <christophe.jaillet@...adoo.fr>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Oleksij Rempel <linux@...pel-privat.de>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] misc: alcor_pci: Fix an error handling path

On Sun, Feb 06, 2022 at 09:39:54AM +0100, Christophe JAILLET wrote:
> A successful ida_simple_get() should be balanced by a corresponding
> ida_simple_remove().
> 
> Add the missing call in the error handling path of the probe.
> 
> While at it, switch to ida_alloc()/ida_free() instead to
> ida_simple_get()/ida_simple_remove().
> The latter is deprecated and more verbose.
> 
> Fixes: 4f556bc04e3c ("misc: cardreader: add new Alcor Micro Cardreader PCI driver")
> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>

Reviewed-by: Oleksij Rempel <o.rempel@...gutronix.de>

Thank you!

> ---
>  drivers/misc/cardreader/alcor_pci.c | 9 ++++++---
>  1 file changed, 6 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/misc/cardreader/alcor_pci.c b/drivers/misc/cardreader/alcor_pci.c
> index de6d44a158bb..3f514d77a843 100644
> --- a/drivers/misc/cardreader/alcor_pci.c
> +++ b/drivers/misc/cardreader/alcor_pci.c
> @@ -266,7 +266,7 @@ static int alcor_pci_probe(struct pci_dev *pdev,
>  	if (!priv)
>  		return -ENOMEM;
>  
> -	ret = ida_simple_get(&alcor_pci_idr, 0, 0, GFP_KERNEL);
> +	ret = ida_alloc(&alcor_pci_idr, GFP_KERNEL);
>  	if (ret < 0)
>  		return ret;
>  	priv->id = ret;
> @@ -280,7 +280,8 @@ static int alcor_pci_probe(struct pci_dev *pdev,
>  	ret = pci_request_regions(pdev, DRV_NAME_ALCOR_PCI);
>  	if (ret) {
>  		dev_err(&pdev->dev, "Cannot request region\n");
> -		return -ENOMEM;
> +		ret = -ENOMEM;
> +		goto error_free_ida;
>  	}
>  
>  	if (!(pci_resource_flags(pdev, bar) & IORESOURCE_MEM)) {
> @@ -324,6 +325,8 @@ static int alcor_pci_probe(struct pci_dev *pdev,
>  
>  error_release_regions:
>  	pci_release_regions(pdev);
> +error_free_ida:
> +	ida_free(&alcor_pci_idr, priv->id);
>  	return ret;
>  }
>  
> @@ -337,7 +340,7 @@ static void alcor_pci_remove(struct pci_dev *pdev)
>  
>  	mfd_remove_devices(&pdev->dev);
>  
> -	ida_simple_remove(&alcor_pci_idr, priv->id);
> +	ida_free(&alcor_pci_idr, priv->id);
>  
>  	pci_release_regions(pdev);
>  	pci_set_drvdata(pdev, NULL);
> -- 
> 2.32.0
> 
> 

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