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Date:   Mon, 18 Mar 2019 16:59:01 -0700 (PDT)
From:   David Miller <>
Subject: Re: [PATCH net] mac8390: Fix mmio access size probe

From: Finn Thain <>
Date: Sat, 16 Mar 2019 14:21:19 +1100

> The bug that Stan reported is as follows. After a restart, a 16-bit NIC
> may be incorrectly identified as a 32-bit NIC and stop working.
> mac8390 slot.E: Memory length resource not found, probing
> mac8390 slot.E: Farallon EtherMac II-C (type farallon)
> mac8390 slot.E: MAC 00:00:c5:30:c2:99, IRQ 61, 32 KB shared memory at 0xfeed0000, 32-bit access.
> The bug never arises after a cold start and only intermittently after a
> warm start. (I didn't investigate why the bug is intermittent.)
> It turns out that memcpy_toio() is deprecated and memcmp_withio() also
> has issues. Replacing these calls with mmio accessors fixes the problem.
> Reported-and-tested-by: Stan Johnson <>
> Fixes: 2964db0f5904 ("m68k: Mac DP8390 update")
> Signed-off-by: Finn Thain <>

Applied and queued up for -stable, thanks.

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