linux-kernel - Re: [PATCH] staging/ks7010: Fix type assignment for struct hostif

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Message-ID: <20170430080044.GC8204@eros>
Date:   Sun, 30 Apr 2017 18:00:44 +1000
From:   "Tobin C. Harding" <me@...in.cc>
To:     Cezary Gapinski <gapalinux@...il.com>
Cc:     gregkh@...uxfoundation.org, wsa@...-dreams.de,
        karniksayli1995@...il.com, shiva@...ev.nl, bhumirks@...il.com,
        mattkilgore12@...il.com, devel@...verdev.osuosl.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging/ks7010: Fix type assignment for struct hostif_hdr

On Sat, Apr 29, 2017 at 07:54:30PM +0200, Cezary Gapinski wrote:
> Sparse spits out a warnings about __le16 and unsigned short assignment.
> Change the type of size and event members of struct hostif_hdr
> to __le16 and correct conversion to the proper cpu type.

I believe that this patch is correct. I am of the opinion though that
endian changes to this driver require prior testing on hardware. There
are some anomalies that I have not figured out yet (for example the
eap header appears to be in network byte order).

I may, however, very well be wrong. It may be perfectly safe to merge
this as is.

Good luck,
Tobin.

> Signed-off-by: Cezary Gapinski <gapalinux@...il.com>
> ---
>  drivers/staging/ks7010/ks7010_sdio.c | 10 ++++++----
>  drivers/staging/ks7010/ks_hostif.h   |  4 ++--
>  2 files changed, 8 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/staging/ks7010/ks7010_sdio.c b/drivers/staging/ks7010/ks7010_sdio.c
> index ec11799..e3a134d 100644
> --- a/drivers/staging/ks7010/ks7010_sdio.c
> +++ b/drivers/staging/ks7010/ks7010_sdio.c
> @@ -269,7 +269,8 @@ static int write_to_device(struct ks_wlan_private *priv, unsigned char *buffer,
>  	hdr = (struct hostif_hdr *)buffer;
>  
>  	DPRINTK(4, "size=%d\n", hdr->size);
> -	if (hdr->event < HIF_DATA_REQ || HIF_REQ_MAX < hdr->event) {
> +	if (le16_to_cpu(hdr->event) < HIF_DATA_REQ ||
> +	    le16_to_cpu(hdr->event) > HIF_REQ_MAX) {
>  		DPRINTK(1, "unknown event=%04X\n", hdr->event);
>  		return 0;
>  	}
> @@ -327,13 +328,14 @@ int ks_wlan_hw_tx(struct ks_wlan_private *priv, void *p, unsigned long size,
>  
>  	hdr = (struct hostif_hdr *)p;
>  
> -	if (hdr->event < HIF_DATA_REQ || HIF_REQ_MAX < hdr->event) {
> +	if (le16_to_cpu(hdr->event) < HIF_DATA_REQ ||
> +	    le16_to_cpu(hdr->event) > HIF_REQ_MAX) {
>  		DPRINTK(1, "unknown event=%04X\n", hdr->event);
>  		return 0;
>  	}
>  
>  	/* add event to hostt buffer */
> -	priv->hostt.buff[priv->hostt.qtail] = hdr->event;
> +	priv->hostt.buff[priv->hostt.qtail] = le16_to_cpu(hdr->event);
>  	priv->hostt.qtail = (priv->hostt.qtail + 1) % SME_EVENT_BUFF_SIZE;
>  
>  	DPRINTK(4, "event=%04X\n", hdr->event);
> @@ -403,7 +405,7 @@ static void ks_wlan_hw_rx(struct ks_wlan_private *priv, uint16_t size)
>  
>  	hdr = (struct hostif_hdr *)&rx_buffer->data[0];
>  	rx_buffer->size = le16_to_cpu(hdr->size) + sizeof(hdr->size);
> -	event = hdr->event;
> +	event = le16_to_cpu(hdr->event);
>  	inc_rxqtail(priv);
>  
>  	ret = ks7010_sdio_writeb(priv, READ_STATUS, REG_STATUS_IDLE);
> diff --git a/drivers/staging/ks7010/ks_hostif.h b/drivers/staging/ks7010/ks_hostif.h
> index d773432..7e4d1aa 100644
> --- a/drivers/staging/ks7010/ks_hostif.h
> +++ b/drivers/staging/ks7010/ks_hostif.h
> @@ -62,8 +62,8 @@
>   */
>  
>  struct hostif_hdr {
> -	u16 size;
> -	u16 event;
> +	__le16 size;
> +	__le16 event;
>  } __packed;
>  
>  struct hostif_data_request_t {
> -- 
> 2.7.4
>