b43: Fix DMA for 30/32-bit DMA engines
This checks if the DMA address is bigger than what the controller can manage. It will reallocate the buffers in the GFP_DMA zone in that case. Signed-off-by: NMichael Buesch <mb@bu3sch.de> Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>
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