[PATCH] mei: discard messages from not connected client during power down.

[Martin Peres]

On 29/05/18 12:04, Greg KH wrote:
> On Tue, May 29, 2018 at 11:56:16AM +0300, Martin Peres wrote:
>> From: Alexander Usyskin <alexander.usyskin at intel.com>
>>
>> This fixes regression introduced by
>> commit 8d52af6795c0 ("mei: speed up the power down flow")
>>
>> In power down or suspend flow a message can still be received
>> from the FW because the clients fake disconnection.
>> In normal case we interpret messages w/o destination as corrupted
>> and link reset is performed in order to clean the channel,
>> but during power down link reset is already in progress resulting
>> in endless loop. To resolve the issue under power down flow we
>> discard messages silently.
>>
>> Cc: <stable at vger.kernel.org> 4.16+
>> Fixes: 8d52af6795c0 ("mei: speed up the power down flow")
>> Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=199541
>> Signed-off-by: Alexander Usyskin <alexander.usyskin at intel.com>
>> Signed-off-by: Tomas Winkler <tomas.winkler at intel.com>
>> ---
>>  drivers/misc/mei/interrupt.c | 5 ++++-
>>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> Shouldn't this patch go through the char/misc maintainer?
> 
> confused,

Sorry for the confusion. I actually tried to avoid this situation by not
Cc:ing everyone, but git send-email did not prompt me to validate the
final email after setting some of the --no-*-cc. Next time, I'll add
--dry-run just to be sure...

Anyway, what I was trying to do is submit this patch to our CI system
since we were the ones reporting the bug. If successful, we will then
apply this patch as a temporary workaround (our core-for-CI branch) to
gather better statistics (reproducing rate is ~5% of our CI runs), and
allow it to land upstream. We'll then drop our workaround when upstream
with the fix gets backmerged in drm-tip.

Sorry again for the noise!

Martin