netdev - Re: [PATCH] NFC: nfcmrvl: add unanchor after anchor

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Message-ID: <339a6580-4c03-8aeb-e790-8645b6501831@canonical.com>
Date:   Thu, 4 Nov 2021 12:28:58 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
To:     Jiasheng Jiang <jiasheng@...as.ac.cn>, yashsri421@...il.com,
        davem@...emloft.net, rdunlap@...radead.org
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] NFC: nfcmrvl: add unanchor after anchor

On 04/11/2021 09:55, Jiasheng Jiang wrote:
> In the error path, the anchored urb is unanchored.
> But in the successful path, the anchored urb is not.
> Therefore, it might be better to add unanchor().
> 
> Fixes: f26e30c ("NFC: nfcmrvl: Initial commit for Marvell NFC driver")
> Signed-off-by: Jiasheng Jiang <jiasheng@...as.ac.cn>
> ---
>  drivers/nfc/nfcmrvl/usb.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/nfc/nfcmrvl/usb.c b/drivers/nfc/nfcmrvl/usb.c
> index bcd563c..f8ae517 100644
> --- a/drivers/nfc/nfcmrvl/usb.c
> +++ b/drivers/nfc/nfcmrvl/usb.c
> @@ -146,9 +146,9 @@ nfcmrvl_submit_bulk_urb(struct nfcmrvl_usb_drv_data *drv_data, gfp_t mem_flags)
>  		if (err != -EPERM && err != -ENODEV)
>  			nfc_err(&drv_data->udev->dev,
>  				"urb %p submission failed (%d)\n", urb, -err);
> -		usb_unanchor_urb(urb);
>  	}
>  
> +	usb_unanchor_urb(urb);
>  	usb_free_urb(urb);
>  
>  	return err;
> 

Why only this place in the driver? And why only this driver - some
others miss it as well (e.g. btusb which was probably the template for
this one). Are you sure it is a correct patch? Did you test it?

Best regards,
Krzysztof