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| author | Fenghua Yu <fenghua.yu@intel.com> | 2009-02-25 06:06:26 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-02-25 18:30:56 +0100 |
| commit | 6aa03ab06978e97b3e0720f83280d7841051916b (patch) | |
| tree | a3575e24836180935611515a3610b59b3a642982 /ipc/shm.c | |
| parent | Merge branch 'proc-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ad... (diff) | |
| download | linux-6aa03ab06978e97b3e0720f83280d7841051916b.tar.xz linux-6aa03ab06978e97b3e0720f83280d7841051916b.zip | |
Fix iwlan DMA mapping direction
When iwlan runs on IOMMU, IOMMU generates a lot of PTE write faults
because PTE write bit is not set on some of PTE's. This is because
iwlan driver calls DMA mapping with PCI_DMA_TODEVICE which is read only
in mapping PTE. But iwlan device actually writes to the mapped page to
update its contents. This issue is not exposed in swiotlb. But VT-d
hardware can capture this fault and stop the fault transaction.
The following patch fixes the issue.
Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
Reviewed-by: Bhavesh Davda <bhavesh@vmware.com>
Tested-by: Chris Wright <chrisw@sous-sol.org>
Acked-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'ipc/shm.c')
0 files changed, 0 insertions, 0 deletions