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staging: brcm80211: added clarification on softmac dma alignment
Descriptor ring can only start at 8KB alignment, this requirement is dictated by DMA hardware. Reported-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: Roland Vossen <rvossen@broadcom.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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@ -24,8 +24,8 @@
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#include "dma.h"
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/*
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* Each descriptor ring must be 8kB aligned, and fit within a
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* contiguous 8kB physical address.
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* DMA hardware requires each descriptor ring to be 8kB aligned, and fit within
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* a contiguous 8kB physical address.
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*/
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#define D64RINGALIGN_BITS 13
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#define D64MAXRINGSZ (1 << D64RINGALIGN_BITS)
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@ -440,6 +440,10 @@ static bool _dma_descriptor_align(struct dma_info *di)
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return true;
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}
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/*
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* Descriptor table must start at the DMA hardware dictated alignment, so
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* allocated memory must be large enough to support this requirement.
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*/
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static void *dma_alloc_consistent(struct pci_dev *pdev, uint size,
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u16 align_bits, uint *alloced,
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dma_addr_t *pap)
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