linux-kernel - Re: [PATCH 3/3] hwmon: (occ) Provide the SBEFIFO FFDC in binary sysfs

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Date:   Tue, 21 Sep 2021 17:37:09 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Eddie James <eajames@...ux.ibm.com>
Cc:     linux-fsi@...ts.ozlabs.org, linux-hwmon@...r.kernel.org,
        linux-kernel@...r.kernel.org, joel@....id.au, linux@...ck-us.net,
        jdelvare@...e.com, alistair@...ple.id.au, jk@...abs.org
Subject: Re: [PATCH 3/3] hwmon: (occ) Provide the SBEFIFO FFDC in binary sysfs

On Tue, Sep 14, 2021 at 04:35:43PM -0500, Eddie James wrote:
> Save any FFDC provided by the OCC driver, and provide it to userspace
> through a binary sysfs entry. Do some basic state management to
> ensure that userspace can always collect the data if there was an
> error. Notify polling userspace when there is an error too.
> 
> Signed-off-by: Eddie James <eajames@...ux.ibm.com>
> ---
>  drivers/hwmon/occ/p9_sbe.c | 98 +++++++++++++++++++++++++++++++++++++-
>  1 file changed, 97 insertions(+), 1 deletion(-)

You forgot a Documentation/ABI/ entry :(

Binary sysfs files are for "pass through to the hardware" only, you
should not be dumping kernel data to userspace through them.  I can't
really determine if this is the case here or not, as there's no
documentation saying what you are trying to represent here...

thanks,

greg k-h