linux-kernel - Re: [PATCH v3 2/5] staging: r8188eu: cast to restricted _

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Date:   Mon, 23 Aug 2021 14:14:26 +0530
From:   Aakash Hemadri <aakashhemadri123@...il.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Larry Finger <Larry.Finger@...inger.net>,
        Phillip Potter <phil@...lpotter.co.uk>
Cc:     linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 2/5] staging: r8188eu: cast to restricted __be32

On 21/08/21 09:48PM, Aakash Hemadri wrote:
> Fix sparse warning:
> > rtw_br_ext.c:836:54: warning: cast to restricted __be32
> 
> dhpch->cookie is be32, change it's type.
> 
> Suggested-by: Larry Finger <Larry.Finger@...inger.net>
> Signed-off-by: Aakash Hemadri <aakashhemadri123@...il.com>
> ---
>  drivers/staging/r8188eu/core/rtw_br_ext.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/staging/r8188eu/core/rtw_br_ext.c b/drivers/staging/r8188eu/core/rtw_br_ext.c
> index f6d1f6029ec3..f65d94bfa286 100644
> --- a/drivers/staging/r8188eu/core/rtw_br_ext.c
> +++ b/drivers/staging/r8188eu/core/rtw_br_ext.c
> @@ -649,7 +649,7 @@ struct dhcpMessage {
>  	u_int8_t chaddr[16];
>  	u_int8_t sname[64];
>  	u_int8_t file[128];
> -	u_int32_t cookie;
> +	__be32 cookie;
>  	u_int8_t options[308]; /* 312 - cookie */
>  };
>  
> @@ -671,7 +671,7 @@ void dhcp_flag_bcast(struct adapter *priv, struct sk_buff *skb)
>  				    (udph->dest == __constant_htons(SERVER_PORT))) { /*  DHCP request */
>  					struct dhcpMessage *dhcph =
>  						(struct dhcpMessage *)((size_t)udph + sizeof(struct udphdr));
> -					u32 cookie = be32_to_cpu((__be32)dhcph->cookie);
> +					u32 cookie = be32_to_cpu(dhcph->cookie);
>  
>  					if (cookie == DHCP_MAGIC) { /*  match magic word */
>  						if (!(dhcph->flags & htons(BROADCAST_FLAG))) {
> -- 
> 2.32.0
> 

David Laight suggested to use get_unaligned_be32, I am not sure if it's
the right thing to do because as far as I understand get_unaligned_be32
byteshifts the argument.

Can someone please confirm if this change is okay?

Thanks,
Aakash Hemadri.