Regression: bcm4312 lp-phy device not recognized in 4.15 kernel

On Sun, 4 Feb 2018 22:00:32 +0000
Chris Vine <[email protected]> wrote:
> On Sun, 4 Feb 2018 12:03:49 -0800
> Florian Fainelli <[email protected]> wrote:
> > On 02/04/2018 10:58 AM, Chris Vine wrote:  
> > > I probably should have copied this to the relevant kernel wireless
> > > mailing lists.  Anyway, here it is.
> > > 
> > > As a further datum point, the b43 driver works fine with the
> > > 4.15.0-rc3 kernel.  So something seems to have changed between
> > > that and 4.15.0.  
> > 
> > Does this patch help?
> > 
> > https://git.kernel.org/pub/scm/linux/kernel/git/kvalo/wireless-drivers.git/commit/?id=a9e6d44ddeccd3522670e641f1ed9b068e746ff7  
> 
> Yes, I have wireless working again.
> 
> I'll recompile tomorrow from a fresh kernel tree and apply the patch
> again and make sure it still works.  I will let you know.

I can confirm that when the kernel is built with that configuration
patch my bcm4312 device works OK again.

Chris

> -----------------------------------------
> > > 
> > > Begin forwarded message:
> > > 
> > > Date: Mon, 29 Jan 2018 23:37:49 +0000
> > > From: Chris Vine <[email protected]>
> > > To: Linux Kernel Mailing List <[email protected]>
> > > Subject: Regression: bcm4312 lp-phy device not recognized in 4.15
> > > kernel
> > > 
> > > 
> > > I have an old netbook with a Broadcom bcm4312 802.11b/g lp-phy
> > > [14e4:4315] (rev 01) wifi device.  It is no longer recognized in
> > > kernel 4.15: it works fine with the 4.14 kernel and earlier, with
> > > the b43 and ssb kernel modules.
> > > 
> > > I cannot give any further information as there are no error
> > > messages logged. The b43 firmware (wl-5.100.138) is not loaded
> > > for it, nor are the ssb/b43/bcma/ mmc_core/mac80211/cfg80211
> > > modules.  The modules can be loaded by hand without error, but
> > > nothing happens and no network interface is presented.
> > > 
> > > This is a pretty slow and rubbish netbook but is useful when
> > > travelling to a country which might impound your laptop (no names)
> > > and you don't mind too much losing it.  It would be nice to
> > > continue to be able to use it for that.
> > > 
> > > Chris
> > >   
> 
>