linux-kernel - Re: [PATCH v2] mtd: rawnand: cafe: fix drivers probe/remove methods

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Date:   Fri, 20 May 2022 18:53:10 +0200
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     Peng Wu <wupeng58@...wei.com>, miquel.raynal@...tlin.com,
        richard@....at, vigneshr@...com
Cc:     linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org, liwei391@...wei.com,
        Kernel Janitors <kernel-janitors@...r.kernel.org>
Subject: Re: [PATCH v2] mtd: rawnand: cafe: fix drivers probe/remove methods

Le 20/05/2022 à 10:44, Peng Wu a écrit :
> Driver should call pci_disable_device() if it returns from
> cafe_nand_probe() with error.
> 
> Meanwhile, the driver calls pci_enable_device() in
> cafe_nand_probe(), but never calls pci_disable_device()
> during removal.
> 
> Signed-off-by: Peng Wu <wupeng58@...wei.com>
> ---
> v2:
> - fix the subject prefix with "mtd: ranwnand: cafe:"
> ---
>   drivers/mtd/nand/raw/cafe_nand.c | 9 +++++++--
>   1 file changed, 7 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/mtd/nand/raw/cafe_nand.c b/drivers/mtd/nand/raw/cafe_nand.c
> index 9dbf031716a6..af119e376352 100644
> --- a/drivers/mtd/nand/raw/cafe_nand.c
> +++ b/drivers/mtd/nand/raw/cafe_nand.c
> @@ -679,8 +679,10 @@ static int cafe_nand_probe(struct pci_dev *pdev,
>   	pci_set_master(pdev);
>   
>   	cafe = kzalloc(sizeof(*cafe), GFP_KERNEL);
> -	if (!cafe)
> -		return  -ENOMEM;
> +	if (!cafe) {
> +		err = -ENOMEM;
> +		goto out_disable_device;
> +	}
>   
>   	mtd = nand_to_mtd(&cafe->nand);
>   	mtd->dev.parent = &pdev->dev;
> @@ -801,6 +803,8 @@ static int cafe_nand_probe(struct pci_dev *pdev,
>   	pci_iounmap(pdev, cafe->mmio);
>    out_free_mtd:
>   	kfree(cafe);
> + out_disable_device:
> +	pci_disable_device(pdev);
>    out:
>   	return err;
>   }
> @@ -822,6 +826,7 @@ static void cafe_nand_remove(struct pci_dev *pdev)
>   	pci_iounmap(pdev, cafe->mmio);
>   	dma_free_coherent(&cafe->pdev->dev, 2112, cafe->dmabuf, cafe->dmaaddr);

Hi,

Not related to this patch , but I wonder if this dma_free_coherent() is 
needed.
It is already part of cafe_nand_detach_chip() which is a .detach_chip() 
function.

Is this .detach_chip() function already called (by nand_cleanup()) 
somewhere in the removal process?

CJ


>   	kfree(cafe);
> +	pci_disable_device(pdev);
>   }
>   
>   static const struct pci_device_id cafe_nand_tbl[] = {