This is a note to let you know that I've just added the patch titled
arm64: dma-mapping: Fix dma_mapping_error() when bypassing SWIOTLB
to the 4.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
arm64-dma-mapping-fix-dma_mapping_error-when-bypassing-swiotlb.patch
and it can be found in the queue-4.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From adbe7e26f4257f72817495b9bce114284060b0d7 Mon Sep 17 00:00:00 2001
From: Robin Murphy <robin.murphy@xxxxxxx>
Date: Wed, 25 Jan 2017 18:31:31 +0000
Subject: arm64: dma-mapping: Fix dma_mapping_error() when bypassing SWIOTLB
From: Robin Murphy <robin.murphy@xxxxxxx>
commit adbe7e26f4257f72817495b9bce114284060b0d7 upstream.
When bypassing SWIOTLB on small-memory systems, we need to avoid calling
into swiotlb_dma_mapping_error() in exactly the same way as we avoid
swiotlb_dma_supported(), because the former also relies on SWIOTLB state
being initialised.
Under the assumptions for which we skip SWIOTLB, dma_map_{single,page}()
will only ever return the DMA-offset-adjusted physical address of the
page passed in, thus we can report success unconditionally.
Fixes: b67a8b29df7e ("arm64: mm: only initialize swiotlb when necessary")
CC: Jisheng Zhang <jszhang@xxxxxxxxxxx>
Reported-by: Aaro Koskinen <aaro.koskinen@xxxxxx>
Signed-off-by: Robin Murphy <robin.murphy@xxxxxxx>
Signed-off-by: Will Deacon <will.deacon@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/arm64/mm/dma-mapping.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
--- a/arch/arm64/mm/dma-mapping.c
+++ b/arch/arm64/mm/dma-mapping.c
@@ -352,6 +352,13 @@ static int __swiotlb_dma_supported(struc
return 1;
}
+static int __swiotlb_dma_mapping_error(struct device *hwdev, dma_addr_t addr)
+{
+ if (swiotlb)
+ return swiotlb_dma_mapping_error(hwdev, addr);
+ return 0;
+}
+
static struct dma_map_ops swiotlb_dma_ops = {
.alloc = __dma_alloc,
.free = __dma_free,
@@ -366,7 +373,7 @@ static struct dma_map_ops swiotlb_dma_op
.sync_sg_for_cpu = __swiotlb_sync_sg_for_cpu,
.sync_sg_for_device = __swiotlb_sync_sg_for_device,
.dma_supported = __swiotlb_dma_supported,
- .mapping_error = swiotlb_dma_mapping_error,
+ .mapping_error = __swiotlb_dma_mapping_error,
};
static int __init atomic_pool_init(void)
Patches currently in stable-queue which might be from robin.murphy@xxxxxxx are
queue-4.10/arm64-dma-mapping-fix-dma_mapping_error-when-bypassing-swiotlb.patch