This is a note to let you know that I've just added the patch titled
dma-debug: Fix dma_debug_entry offset calculation
to the 3.14-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:
dma-debug-fix-dma_debug_entry-offset-calculation.patch
and it can be found in the queue-3.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 0354aec19ce3d355c6213b0434064efc25c9b22c Mon Sep 17 00:00:00 2001
From: Daniel Mentz <danielmentz@xxxxxxxxxx>
Date: Tue, 15 Dec 2015 17:38:48 -0800
Subject: dma-debug: Fix dma_debug_entry offset calculation
From: Daniel Mentz <danielmentz@xxxxxxxxxx>
commit 0354aec19ce3d355c6213b0434064efc25c9b22c upstream.
dma-debug uses struct dma_debug_entry to keep track of dma coherent
memory allocation requests. The virtual address is converted into a pfn
and an offset. Previously, the offset was calculated using an incorrect
bit mask. As a result, we saw incorrect error messages from dma-debug
like the following:
"DMA-API: exceeded 7 overlapping mappings of cacheline 0x03e00000"
Cacheline 0x03e00000 does not exist on our platform.
Fixes: 0abdd7a81b7e ("dma-debug: introduce debug_dma_assert_idle()")
Signed-off-by: Daniel Mentz <danielmentz@xxxxxxxxxx>
Signed-off-by: Dan Williams <dan.j.williams@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
lib/dma-debug.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/lib/dma-debug.c
+++ b/lib/dma-debug.c
@@ -1440,7 +1440,7 @@ void debug_dma_alloc_coherent(struct dev
entry->type = dma_debug_coherent;
entry->dev = dev;
entry->pfn = page_to_pfn(virt_to_page(virt));
- entry->offset = (size_t) virt & PAGE_MASK;
+ entry->offset = (size_t) virt & ~PAGE_MASK;
entry->size = size;
entry->dev_addr = dma_addr;
entry->direction = DMA_BIDIRECTIONAL;
@@ -1456,7 +1456,7 @@ void debug_dma_free_coherent(struct devi
.type = dma_debug_coherent,
.dev = dev,
.pfn = page_to_pfn(virt_to_page(virt)),
- .offset = (size_t) virt & PAGE_MASK,
+ .offset = (size_t) virt & ~PAGE_MASK,
.dev_addr = addr,
.size = size,
.direction = DMA_BIDIRECTIONAL,
Patches currently in stable-queue which might be from danielmentz@xxxxxxxxxx are
queue-3.14/dma-debug-fix-dma_debug_entry-offset-calculation.patch
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