linux-kernel - RE: [PATCH 1/4] rtw88: Add packed attribute to the eFuse structs

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Date:   Thu, 29 Dec 2022 09:24:52 +0000
From:   Ping-Ke Shih <pkshih@...ltek.com>
To:     Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        "linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>
CC:     "tony0620emma@...il.com" <tony0620emma@...il.com>,
        "kvalo@...nel.org" <kvalo@...nel.org>,
        "tehuang@...ltek.com" <tehuang@...ltek.com>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 1/4] rtw88: Add packed attribute to the eFuse structs



> -----Original Message-----
> From: Martin Blumenstingl <martin.blumenstingl@...glemail.com>
> Sent: Wednesday, December 28, 2022 9:36 PM
> To: linux-wireless@...r.kernel.org
> Cc: tony0620emma@...il.com; kvalo@...nel.org; Ping-Ke Shih <pkshih@...ltek.com>; tehuang@...ltek.com;
> s.hauer@...gutronix.de; netdev@...r.kernel.org; linux-kernel@...r.kernel.org; Martin Blumenstingl
> <martin.blumenstingl@...glemail.com>
> Subject: [PATCH 1/4] rtw88: Add packed attribute to the eFuse structs
> 
> The eFuse definitions in the rtw88 are using structs to describe the
> eFuse contents. Add the packed attribute to all structs used for the
> eFuse description so the compiler doesn't add gaps or re-order
> attributes.
> 
> Also change the type of the res2..res3 eFuse fields to u16 to avoid the
> following warning, now that their surrounding struct has the packed
> attribute:
>   note: offset of packed bit-field 'res2' has changed in GCC 4.4
> 
> Fixes: e3037485c68e ("rtw88: new Realtek 802.11ac driver")
> Fixes: ab0a031ecf29 ("rtw88: 8723d: Add read_efuse to recognize efuse info from map")
> Fixes: 769a29ce2af4 ("rtw88: 8821c: add basic functions")
> Fixes: 87caeef032fc ("wifi: rtw88: Add rtw8723du chipset support")
> Fixes: aff5ffd718de ("wifi: rtw88: Add rtw8821cu chipset support")
> Signed-off-by: Martin Blumenstingl <martin.blumenstingl@...glemail.com>
> ---
>  drivers/net/wireless/realtek/rtw88/main.h     |  6 +++---
>  drivers/net/wireless/realtek/rtw88/rtw8723d.h |  6 +++---
>  drivers/net/wireless/realtek/rtw88/rtw8821c.h | 20 +++++++++----------
>  drivers/net/wireless/realtek/rtw88/rtw8822b.h | 20 +++++++++----------
>  drivers/net/wireless/realtek/rtw88/rtw8822c.h | 20 +++++++++----------
>  5 files changed, 36 insertions(+), 36 deletions(-)
> 

[...]

> @@ -43,13 +43,13 @@ struct rtw8821ce_efuse {
>  	u8 link_cap[4];
>  	u8 link_control[2];
>  	u8 serial_number[8];
> -	u8 res0:2;			/* 0xf4 */
> -	u8 ltr_en:1;
> -	u8 res1:2;
> -	u8 obff:2;
> -	u8 res2:3;
> -	u8 obff_cap:2;
> -	u8 res3:4;
> +	u16 res0:2;			/* 0xf4 */
> +	u16 ltr_en:1;
> +	u16 res1:2;
> +	u16 obff:2;
> +	u16 res2:3;
> +	u16 obff_cap:2;
> +	u16 res3:4;

These should be __le16. Though bit fields are suitable to efuse layout, 
we don't access these fields for now. It would be well.

[...]