linux-kernel - Re: [PATCH] misc: cxl: Move a deference below a NULL test

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Date:   Tue, 2 Oct 2018 15:55:58 -0700
From:   Greg KH <gregkh@...uxfoundation.org>
To:     zhong jiang <zhongjiang@...wei.com>
Cc:     fbarrat@...ux.vnet.ibm.com, andrew.donnellan@....ibm.com,
        arnd@...db.de, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] misc: cxl: Move a deference below a NULL test

On Wed, Sep 26, 2018 at 07:41:12PM +0800, zhong jiang wrote:
> It is safe to move a deference below a NULL test.
> 
> Signed-off-by: zhong jiang <zhongjiang@...wei.com>
> Acked-by: Andrew Donnellan <andrew.donnellan@....ibm.com>
> ---
>  drivers/misc/cxl/guest.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/misc/cxl/guest.c b/drivers/misc/cxl/guest.c
> index 3bc0c15..559e835 100644
> --- a/drivers/misc/cxl/guest.c
> +++ b/drivers/misc/cxl/guest.c
> @@ -1018,11 +1018,11 @@ int cxl_guest_init_afu(struct cxl *adapter, int slice, struct device_node *afu_n
>  
>  void cxl_guest_remove_afu(struct cxl_afu *afu)
>  {
> -	pr_devel("in %s - AFU(%d)\n", __func__, afu->slice);
> -
>  	if (!afu)
>  		return;
>  
> +	pr_devel("in %s - AFU(%d)\n", __func__, afu->slice);
> +

This call should just be deleted, ftrace can be used if this type of
thing is really needed.

thanks,

greg k-h