linux-kernel - Re: [PATCH 2/4] powerpc/vas: Fix cleanup when VAS is not configured

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Date:   Mon, 12 Feb 2018 16:23:50 +1100
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
Cc:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        mikey@...ling.org, hbabu@...ibm.com, linuxppc-dev@...abs.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/4] powerpc/vas: Fix cleanup when VAS is not configured

Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com> writes:

> When VAS is not configured in the system, make sure to remove
> the VAS debugfs directory and unregister the platform driver.
>
> Signed-off-by: Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
...
> diff --git a/arch/powerpc/platforms/powernv/vas.c b/arch/powerpc/platforms/powernv/vas.c
> index aebbe95..f83e27d8 100644
> --- a/arch/powerpc/platforms/powernv/vas.c
> +++ b/arch/powerpc/platforms/powernv/vas.c
> @@ -169,8 +169,11 @@ static int __init vas_init(void)
>  		found++;
>  	}
>  
> -	if (!found)
> +	if (!found) {
> +		platform_driver_unregister(&vas_driver);
> +		vas_cleanup_dbgdir();
>  		return -ENODEV;
> +	}

The better patch would be to move the call to vas_init_dbgdir() down
here, where we know we have successfully registered the driver.

cheers