27 lines
970 B
Diff
27 lines
970 B
Diff
From: Ben Greear <greearb@candelatech.com>
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Date: Tue, 29 Nov 2016 14:00:28 -0800
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Subject: [PATCH] ath10k: wmi-alloc-chunk should use DMA_BIDIRECTIONAL.
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These memory chunks are often used as 'swap' by the NIC,
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so it will be both reading and writing to these areas.
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This seems to fix errors like this on my x86-64 machine:
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kernel: DMAR: DMAR:[DMA Write] Request device [05:00.0] fault addr ff5de000
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DMAR:[fault reason 05] PTE Write access is not set
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Tested-by: Marek Behun <kabel@blackhole.sk>
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Signed-off-by: Ben Greear <greearb@candelatech.com>
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---
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--- a/drivers/net/wireless/ath/ath10k/wmi.c
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+++ b/drivers/net/wireless/ath/ath10k/wmi.c
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@@ -4495,7 +4495,7 @@ static int ath10k_wmi_alloc_chunk(struct
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if (!num_units)
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return -ENOMEM;
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- paddr = dma_map_single(ar->dev, vaddr, pool_size, DMA_TO_DEVICE);
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+ paddr = dma_map_single(ar->dev, vaddr, pool_size, DMA_BIDIRECTIONAL);
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if (dma_mapping_error(ar->dev, paddr)) {
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kfree(vaddr);
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return -ENOMEM;
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