linux-kernel - [BISECTED REGRESSION] b43legacy broken on G4 PowerBook

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Message-ID: <20190605225059.GA9953@darkstar.musicnaut.iki.fi>
Date:   Thu, 6 Jun 2019 01:50:59 +0300
From:   Aaro Koskinen <aaro.koskinen@....fi>
To:     Christoph Hellwig <hch@....de>,
        Christian Zigotzky <chzigotzky@...osoft.de>,
        Michael Ellerman <mpe@...erman.id.au>,
        Larry Finger <Larry.Finger@...inger.net>
Cc:     linux-kernel@...r.kernel.org, linux-wireless@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org
Subject: [BISECTED REGRESSION] b43legacy broken on G4 PowerBook

Hi,

When upgrading from v5.0 -> v5.1 on G4 PowerBook, I noticed WLAN does
not work anymore:

[   42.004303] b43legacy-phy0: Loading firmware version 0x127, patch level 14 (2005-04-18 02:36:27)
[   42.184837] b43legacy-phy0 debug: Chip initialized
[   42.184873] b43legacy-phy0 ERROR: The machine/kernel does not support the required 30-bit DMA mask

The same happens with the current mainline.

Bisected to:

	commit 65a21b71f948406201e4f62e41f06513350ca390
	Author: Christoph Hellwig <hch@....de>
	Date:   Wed Feb 13 08:01:26 2019 +0100

	    powerpc/dma: remove dma_nommu_dma_supported

	    This function is largely identical to the generic version used
	    everywhere else.  Replace it with the generic version.

	    Signed-off-by: Christoph Hellwig <hch@....de>
	    Tested-by: Christian Zigotzky <chzigotzky@...osoft.de>
	    Signed-off-by: Michael Ellerman <mpe@...erman.id.au>

A.