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| author | Michael Ellerman <michael@ellerman.id.au> | 2008-02-08 16:37:04 +1100 |
|---|---|---|
| committer | Paul Mackerras <paulus@samba.org> | 2008-02-08 19:52:40 +1100 |
| commit | 4a8df1507eaeefc9739e3762db606caa08edba98 (patch) | |
| tree | e46f928e8b93809a882a5d7bfc12fd890ff1ffa7 /arch/powerpc | |
| parent | 0e0b47abb71a2c4aed5895c01f41827dbd8a981c (diff) | |
| download | linux-3.10-4a8df1507eaeefc9739e3762db606caa08edba98.tar.gz linux-3.10-4a8df1507eaeefc9739e3762db606caa08edba98.tar.bz2 linux-3.10-4a8df1507eaeefc9739e3762db606caa08edba98.zip | |
[POWERPC] Fix potential cell IOMMU bug when switching back to default DMA ops
If we get a 64-bit dma mask we switch to the fixed ops and call
cell_dma_dev_setup(). If the driver then switches back to a 32-bit dma
mask for any reason we don't call cell_dma_dev_setup() again, which
has the potential to leave bogus data in dev->archdata.dma_data.
Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch/powerpc')
| -rw-r--r-- | arch/powerpc/platforms/cell/iommu.c | 15 |
1 files changed, 7 insertions, 8 deletions
diff --git a/arch/powerpc/platforms/cell/iommu.c b/arch/powerpc/platforms/cell/iommu.c index 1f7b2547408..5cdcd363825 100644 --- a/arch/powerpc/platforms/cell/iommu.c +++ b/arch/powerpc/platforms/cell/iommu.c @@ -841,19 +841,18 @@ static int dma_set_mask_and_switch(struct device *dev, u64 dma_mask) if (!dev->dma_mask || !dma_supported(dev, dma_mask)) return -EIO; - if (dma_mask == DMA_BIT_MASK(64)) { - if (cell_iommu_get_fixed_address(dev) == OF_BAD_ADDR) - dev_dbg(dev, "iommu: 64-bit OK, but bad addr\n"); - else { - dev_dbg(dev, "iommu: 64-bit OK, using fixed ops\n"); - set_dma_ops(dev, &dma_iommu_fixed_ops); - cell_dma_dev_setup(dev); - } + if (dma_mask == DMA_BIT_MASK(64) && + cell_iommu_get_fixed_address(dev) != OF_BAD_ADDR) + { + dev_dbg(dev, "iommu: 64-bit OK, using fixed ops\n"); + set_dma_ops(dev, &dma_iommu_fixed_ops); } else { dev_dbg(dev, "iommu: not 64-bit, using default ops\n"); set_dma_ops(dev, get_pci_dma_ops()); } + cell_dma_dev_setup(dev); + *dev->dma_mask = dma_mask; return 0; |