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Date:   Wed, 20 Dec 2017 19:26:03 +0100
From:   Javier Martinez Canillas <>
To:     Jason Gunthorpe <>,
        "Shaikh, Azhar" <>
Cc:     "" <>,
        James Ettle <>,
        Hans de Goede <>,
        Arnd Bergmann <>,
        Jarkko Sakkinen <>,
        Peter Huewe <>,
        Greg Kroah-Hartman <>,
        "" <>
Subject: Re: [PATCH 2/4] tpm: delete the TPM_TIS_CLK_ENABLE flag

On 12/20/2017 07:10 PM, Jason Gunthorpe wrote:
> On Wed, Dec 20, 2017 at 03:19:19PM +0000, Shaikh, Azhar wrote:
>>> This flag is only used to warn if CLKRUN_EN wasn't disabled on Braswell
>>> systems, but the only way this can happen is if the code is not correct.
>>> So it's an unnecessary check that just makes the code harder to read.
>> This code was implemented as a suggestion from Jason on the previous patches. 
> The concept was to be like ASSERT_RTNL, maybe it just needs a suitably
> named static inline to addrress Javier's readability concerns?

I really think is not worth it and pollutes all the tpm_tcg_{read,write}
functions with those is_bsw() and flags checks. Your example is different
since is a core API used by in lot of places in the kernel, but it's not
the case here.

But I don't have a strong opinion either, it was Jarkko who questioned
the value of the flag so I can drop this patch too if you disagree with
the change. I'm mostly interested in PATCH 4/4 that's the actual fix.
> Jason

Best regards,
Javier Martinez Canillas
Software Engineer - Desktop Hardware Enablement
Red Hat

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