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| author | Matt Wagantall <mattw@codeaurora.org> | 2015-06-29 18:53:20 -0700 |
|---|---|---|
| committer | David Keitel <dkeitel@codeaurora.org> | 2016-03-22 11:13:16 -0700 |
| commit | d5a18b907bb75e6389516648f39364c909b7eff8 (patch) | |
| tree | ce368ebbd9aa3b34b36c4b0fb1ed5c143391e3f0 /include/linux | |
| parent | 4f3cba201550cf8b64987790d0831633594f1f49 (diff) | |
arm64: dma-mapping: fix attribs for non-coherent strongly-ordered mappings
An incorrect conflict resolution when picking up 07c17f4e0b71d ("arm64:
add support for NO_KERNEL_MAPPING and STRONGLY_ORDERED") caused
MT_NORMAL_NC attributes being set for strongly-ordered mappings, rather
than MT_DEVICE_nGnRnE attributes.
As a result of this, speculative data fetches of the incorrectly-
mapped memory have been observed. In cases where this memory is
XPU protected or reads result in side-effects, this may result in
device crashes.
Fix this by setting the attributes returned by pgprot_noncached()
regardless of the value of the coherent flag passed to
__get_dma_pgprot()
Change-Id: Iec56027e280ae0920016df3066045b71299a915b
Signed-off-by: Matt Wagantall <mattw@codeaurora.org>
Diffstat (limited to 'include/linux')
0 files changed, 0 insertions, 0 deletions