linux-kernel - Re: [PATCH 3/6] misc: sbrmi: Use regmap subsystem

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <2024070400-sweat-playback-3a80@gregkh>
Date: Thu, 4 Jul 2024 13:53:19 +0200
From: Greg KH <gregkh@...uxfoundation.org>
To: Akshay Gupta <akshay.gupta@....com>
Cc: linux-hwmon@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux@...ck-us.net, arnd@...db.de, naveenkrishna.chatradhi@....com
Subject: Re: [PATCH 3/6] misc: sbrmi: Use regmap subsystem

On Thu, Jul 04, 2024 at 11:16:21AM +0000, Akshay Gupta wrote:
> - regmap subsystem provides multiple benefits over direct smbus APIs

In what way, please document.

> - The susbsytem can be helpful in following cases
>   - Differnet types of bus (i2c/i3c)
>   - Different Register address size (1byte/2byte)

Is that what is happening here?  I don't see i3c support...

> --- a/include/misc/amd-sb.h
> +++ b/include/misc/amd-sb.h
> @@ -7,8 +7,8 @@
>  #define _AMD_SB_H_
>  
>  #include <linux/mutex.h>
> -#include <linux/i2c.h>

Why remove this?

>  #include <linux/platform_device.h>
> +#include <linux/regmap.h>
>  /*
>   * SB-RMI supports soft mailbox service request to MP1 (power management
>   * firmware) through SBRMI inbound/outbound message registers.
> @@ -23,11 +23,11 @@ enum sbrmi_msg_id {
>  
>  /* Each client has this additional data */
>  struct sbrmi_data {
> -	struct i2c_client *client;
> +	struct regmap *regmap;
>  	struct mutex lock;
>  	struct platform_device *pdev;
>  	u32 pwr_limit_max;
> -};
> +} __packed;

Why is this suddenly required to be __packed?

Isn't that going to cause more problems than it is worth?  And why is it
worth it at all?

thanks,

greg k-h