Re: PROBLEM: 5.3.0-rc* causes iwlwifi failure

[Stuart Little]

After some private coaching from Serge Belyshev on git-revert I can confirm that reverting that commit atop the current tree resolves the issue (the wifi card scans for and finds networks just fine, no dmesg errors reported, etc.).

On Sat, Aug 17, 2019 at 11:59:59AM +0300, Serge Belyshev wrote:
> 
> > I am on an Intel(R) Core(TM) i7-7500U CPU @ 2.70GHz running Linux
> > x86_64 (Slackware), with a custom-compiled 5.3.0-rc4 (.config
> > attached).
> >
> > I am using the Intel wifi adapter on this machine:
> >
> > 02:00.0 Network controller: Intel Corporation Device 24fb (rev 10)
> >
> > with the iwlwifi driver. I am attaching the output to 'lspci -vv -s
> > 02:00.0' as the file device-info.
> >
> > All 5.3.0-rc* versions I have tried (including rc4) cause multiple
> > dmesg iwlwifi-related errors (dmesg attached). Examples:
> >
> > iwlwifi 0000:02:00.0: Failed to get geographic profile info -5
> > iwlwifi 0000:02:00.0: Microcode SW error detected.  Restarting 0x82000000
> > iwlwifi 0000:02:00.0: 0x00000038 | BAD_COMMAND
> >
> 
> I have my logs filled with similar garbage throughout 5.3-rc*. Also
> since 5.3-rcsomething not only it WARNS in dmesg about firmware failure,
> but completely stops working after suspend/resume cycle.
> 
> It looks like that:
> 
> commit 4fd445a2c855bbcab81fbe06d110e78dbd974a5b
> Author: Haim Dreyfuss <haim.dreyfuss@xxxxxxxxx>
> Date:   Thu May 2 11:45:02 2019 +0300
> 
>     iwlwifi: mvm: Add log information about SAR status
>     
>     Inform users when SAR status is changing.
>     
>     Signed-off-by: Haim Dreyfuss <haim.dreyfuss@xxxxxxxxx>
>     Signed-off-by: Luca Coelho <luciano.coelho@xxxxxxxxx>
> 
> 
> is the culprit. (manually) reverting it on top of 5.3-rc4 makes
> everything work again.