netdev - Re: [PATCH] staging: qlge: add unregister_netdev in qlge

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Date:   Fri, 18 Feb 2022 15:03:44 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Hangyu Hua <hbh25y@...il.com>
Cc:     manishc@...vell.com, GR-Linux-NIC-Dev@...vell.com,
        coiby.xu@...il.com, gregkh@...uxfoundation.org,
        netdev@...r.kernel.org, linux-staging@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging: qlge: add unregister_netdev in qlge_probe

On Fri, Feb 18, 2022 at 04:11:30PM +0800, Hangyu Hua wrote:
> unregister_netdev need to be called when register_netdev succeeds
> qlge_health_create_reporters fails.
> 

1) Add a Fixes tag:

Fixes: d8827ae8e22b ("staging: qlge: deal with the case that devlink_health_reporter_create fails")

> Signed-off-by: Hangyu Hua <hbh25y@...il.com>
> ---
>  drivers/staging/qlge/qlge_main.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/staging/qlge/qlge_main.c b/drivers/staging/qlge/qlge_main.c
> index 9873bb2a9ee4..0a199c6d77a1 100644
> --- a/drivers/staging/qlge/qlge_main.c
> +++ b/drivers/staging/qlge/qlge_main.c
> @@ -4611,8 +4611,10 @@ static int qlge_probe(struct pci_dev *pdev,
>  	}
>  
>  	err = qlge_health_create_reporters(qdev);
> -	if (err)
> +	if (err) {
> +		unregister_netdev(ndev);
>  		goto netdev_free;
> +	}

2) Use a goto to unwind.  3) Release the other pdev stuff as well.
4)  Clean up the error handling for register_netdev() by using a goto
as well.

	err = register_netdev(ndev);
	if (err) {
		dev_err(&pdev->dev, "net device registration failed.\n");
		goto cleanup_pdev;
	}

	err = qlge_health_create_reporters(qdev);
	if (err)
		goto unregister_netdev;

	...

	return 0;

unregister_netdev:
	unregister_netdev(ndev);
cleanup_pdev:
	qlge_release_all(pdev);
	pci_disable_device(pdev);
netdev_free:
	free_netdev(ndev);
devlink_free:
	devlink_free(devlink);

	return ret;

regards,
dan carpenter