linux-kernel - Re: [PATCH v2 1/1] tpm/tpm_i2c_infineon: Fix init endian vendor check

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Message-ID: <20210913130210.GD3544071@ziepe.ca>
Date:   Mon, 13 Sep 2021 10:02:10 -0300
From:   Jason Gunthorpe <jgg@...pe.ca>
To:     Florian Eckert <fe@....tdt.de>
Cc:     peterhuewe@....de, jarkko@...nel.org,
        Eckert.Florian@...glemail.com, linux-integrity@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/1] tpm/tpm_i2c_infineon: Fix init endian vendor check

On Mon, Sep 13, 2021 at 02:05:21PM +0200, Florian Eckert wrote:
> On my embedded system I use this tpm infineon chip via i2c bus.
> The system is a MIPS architecture and therefore works in big endian mode.
> 
> The problem is, that the chip type is not correctly recognized,
> because the vendor ID is wrongly aligned in the memory.
> 
> By declaring the vendor ID variable as a `__le32` type, the TPM chip is
> then correctly recognized by the driver and feels then responsible.
> 
> The device works than as expected.
> 
> Signed-off-by: Florian Eckert <fe@....tdt.de>
> ---
> v2:
> * use variable type instead of le32_to_cpus function call
>  drivers/char/tpm/tpm_i2c_infineon.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

And if you do this it need to be made sparse clean/etc

Jason