linux-kernel - Re: [PATCH 4.4 08/56] ath10k: fix rfc1042 header retrieval in QCA4019 with eth decap mode

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Message-ID: <1528389764.2289.77.camel@codethink.co.uk>
Date:   Thu, 07 Jun 2018 17:42:44 +0100
From:   Ben Hutchings <ben.hutchings@...ethink.co.uk>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Sriram R <srirrama@...eaurora.org>, stable@...r.kernel.org,
        Vasanthakumar Thiagarajan <vthiagar@....qualcomm.com>,
        Kalle Valo <kvalo@....qualcomm.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4.4 08/56] ath10k: fix rfc1042 header retrieval in
 QCA4019 with eth decap mode

On Thu, 2018-06-07 at 18:16 +0200, Greg Kroah-Hartman wrote:
> On Thu, Jun 07, 2018 at 04:49:57PM +0100, Ben Hutchings wrote:
> > On Thu, 2018-06-07 at 17:22 +0530, Sriram R wrote:
> > > Hi Ben,
> > > 
> > > On 2018-06-04 23:22, Ben Hutchings wrote:
> > > > On Mon, 2018-05-14 at 08:48 +0200, Greg Kroah-Hartman wrote:
> > > > > 4.4-stable review patch.  If anyone has any objections, please let me 
> > > > > know.
> > > > > 
> > > > > ------------------
> > > > > 
> > > > > From: Vasanthakumar Thiagarajan <vthiagar@....qualcomm.com>
> > > > > 
> > > > > commit 2f38c3c01de945234d23dd163e3528ccb413066d upstream.
> > > > > 
> > > > > Chipset from QCA99X0 onwards (QCA99X0, QCA9984, QCA4019 & future)
> > > > > rx_hdr_status is not padded to align in 4-byte boundary. Define a
> > > > > new hw_params field to handle different alignment behaviour between
> > > > > different hw. This patch fixes improper retrieval of rfc1042 header
> > > > > with QCA4019. This patch along with "ath10k: Properly remove padding
> > > > > from the start of rx payload" will fix traffic failure in ethernet
> > > > > decap mode for QCA4019.
> > > > > 
> > > > > Signed-off-by: Vasanthakumar Thiagarajan <vthiagar@....qualcomm.com>
> > > > > Signed-off-by: Kalle Valo <kvalo@....qualcomm.com>
> > > > > Signed-off-by: Sriram R <srirrama@...eaurora.org>
> > > > > Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> > > > 
> > > > [...]
> > > > 
> > > > I'm curious as to why this backport doesn't include the change to
> > > > ath10k_htt_rx_h_find_rfc1042().  I understand that the addition of the
> > > > new field is a dependency for the following patch, but shouldn't the
> > > > fix included in the upstream commit also be applied to 4.4?
> > > > 
> > > 
> > >    Our main intention with this patchset [1] was to provide fix for 
> > > replay detection security issue seen in ath10k driver which needed to be 
> > > in the stable releases.
> > > 
> > > And, as per stable tree guidelines we wanted the patchset to have only 
> > > one and this important fix .
> > 
> > OK, I think the problem here is that the rules say "must" when what's
> > really meant is "should".  So the rule "It must fix only one thing."
> > really means that commits that each make a single logical change are
> > strongly preferred.
> > 
> > It does not mean that upstream commits should be trimmed down to
> > conform to this.  Greg generally considers it more important to avoid
> > changes to the upstream commit, where possible.  Right, Greg?
> > 
> > And speaking only for myself, I particularly dislike stable backports
> > that are significantly different from the original upstream commit but
> > don't mention this difference in the commit message.
> 
> I _STRONGLY_ dislike backports that are different than what is in
> Linus's tree and normally I catch it when someone tries to do that.  I
> missed this one here, and that's not ok on my part for missing that, and
> for the authors part in doing that :(
> 
> So, what to do here, should I revert this series and take a fixed-up
> one?  What exactly is the stable tree now missing because of this
> mistake?

If you apply the attached patch, that should complete the backporting
of commit 2f38c3c01de9.  I'm not able to test the driver but the change
looks reasonable and it builds OK.

Ben.

-- 
Ben Hutchings, Software Developer                         Codethink Ltd
https://www.codethink.co.uk/                 Dale House, 35 Dale Street
                                     Manchester, M1 2HF, United Kingdom
View attachment "0001-ath10k-fix-rfc1042-header-retrieval-in-QCA4019-with-.patch" of type "text/x-patch" (2263 bytes)