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b43 / b43 legacy dma mask cleanups

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To: Larry Finger <Larry.Finger@xxxxxxxxxxxx>, Kalle Valo <kvalo@xxxxxxxxxxxxxx>
Subject: b43 / b43 legacy dma mask cleanups
From: Christoph Hellwig <hch@xxxxxx>
Date: Tue, 25 Jun 2019 12:29:28 +0200
Cc: b43-dev@xxxxxxxxxxxxxxxxxxx, linux-wireless@xxxxxxxxxxxxxxx, netdev@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx

Hi all,

below are a few cleanups for the DMA mask handling.  I came up with these
untested patches after looking through the code to debug the 32-bit pmac
30-bit dma issue involving b43legacy.

Follow-Ups:
- [PATCH 2/4] b43legacy: simplify engine type / DMA mask selection
  - From: Christoph Hellwig
- [PATCH 4/4] b43: simplify engine type / DMA mask selection
  - From: Christoph Hellwig
- [PATCH 3/4] b43: remove b43_dma_set_mask
  - From: Christoph Hellwig
- [PATCH 1/4] b43legacy: remove b43legacy_dma_set_mask
  - From: Christoph Hellwig

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