linux-kernel - Re: [PATCH linux dev-4.10 3/6] drivers/misc: Add driver for Aspeed PECI and generic PECI headers

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Message-ID: <20180110102011.GC5822@kroah.com>
Date:   Wed, 10 Jan 2018 11:20:11 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Jae Hyun Yoo <jae.hyun.yoo@...ux.intel.com>
Cc:     joel@....id.au, andrew@...id.au, arnd@...db.de, jdelvare@...e.com,
        linux@...ck-us.net, linux-kernel@...r.kernel.org,
        linux-doc@...r.kernel.org, devicetree@...r.kernel.org,
        linux-hwmon@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        openbmc@...ts.ozlabs.org
Subject: Re: [PATCH linux dev-4.10 3/6] drivers/misc: Add driver for Aspeed
 PECI and generic PECI headers

On Tue, Jan 09, 2018 at 02:31:23PM -0800, Jae Hyun Yoo wrote:
> +#pragma pack(push, 1)
> +struct peci_xfer_msg {
> +	unsigned char client_addr;
> +	unsigned char tx_len;
> +	unsigned char rx_len;
> +	unsigned char tx_buf[MAX_BUFFER_SIZE];
> +	unsigned char rx_buf[MAX_BUFFER_SIZE];
> +};
> +#pragma pack(pop)

For any structure that crosses the user/kernel boundry, you _HAVE_ to
use the "__" variant.  So for here you would use __u8 instead of
"unsigned char" in order for things to work properly.

I'm guessing you didn't test this all out on a mixed 32/64 bit system?

Please fix up and test to ensure that it all works properly before
resubmitting.

thanks,

greg k-h