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[POWERPC] Fix potential cell IOMMU bug when switching back to default DMA ops

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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>
This commit is contained in:
Michael Ellerman 2008-02-08 16:37:04 +11:00 committed by Paul Mackerras
parent 0e0b47abb7
commit 4a8df1507e
1 changed files with 7 additions and 8 deletions
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15
arch/powerpc/platforms/cell/iommu.c
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@ -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;