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Date:   Fri, 4 Oct 2019 15:16:56 +0200
From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     Tomas Winkler <tomas.winkler@intel.com>
Cc:     Alexander Usyskin <alexander.usyskin@intel.com>,
        linux-kernel@vger.kernel.org, stable@vger.kernel.org,
        Paul Menzel <pmenzel@molgen.mpg.de>
Subject: Re: [char-misc for v4.5-rc2 2/2] mei: avoid FW version request on
 Ibex Peak and earlier
Message-ID: <20191004131656.GA703365@kroah.com>
References: <20191001235958.19979-1-tomas.winkler@intel.com>
 <20191001235958.19979-2-tomas.winkler@intel.com>
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On Wed, Oct 02, 2019 at 02:59:58AM +0300, Tomas Winkler wrote:
> From: Alexander Usyskin <alexander.usyskin@intel.com>
> 
> The fixed MKHI client on PCH 6 gen platforms
> does not support fw version retrieval.
> The error is not fatal, but it fills up the kernel logs and
> slows down the driver start.
> This patch disables requesting FW version on GEN6 and earlier platforms.
> 
> Fixes warning:
> [   15.964298] mei mei::55213584-9a29-4916-badf-0fb7ed682aeb:01: Could not read FW version
> [   15.964301] mei mei::55213584-9a29-4916-badf-0fb7ed682aeb:01: version command failed -5
> 
> Cc: <stable@vger.kernel.org> +v4.18
> Cc: Paul Menzel <pmenzel@molgen.mpg.de>
> Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com>
> Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
> ---
>  drivers/misc/mei/bus-fixup.c | 16 +++++++++++++---
>  drivers/misc/mei/hw-me.c     | 21 ++++++++++++++++++---
>  drivers/misc/mei/hw-me.h     |  8 ++++++--
>  drivers/misc/mei/mei_dev.h   |  4 ++++
>  drivers/misc/mei/pci-me.c    | 10 +++++-----
>  5 files changed, 46 insertions(+), 13 deletions(-)
> 
> diff --git a/drivers/misc/mei/bus-fixup.c b/drivers/misc/mei/bus-fixup.c
> index 32e9b1aed2ca..5ac679ac9b19 100644
> --- a/drivers/misc/mei/bus-fixup.c
> +++ b/drivers/misc/mei/bus-fixup.c
> @@ -218,13 +218,23 @@ static void mei_mkhi_fix(struct mei_cl_device *cldev)
>  {
>  	int ret;
>  
> +	dev_dbg(&cldev->dev, "running hook %s\n", __func__);

That is what ftrace is for, don't sprinkle that all over the kernel for
no reason :(

thanks,

greg k-h