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Diffstat (limited to 'drivers/block/cciss.c')
-rw-r--r--drivers/block/cciss.c11
1 files changed, 8 insertions, 3 deletions
diff --git a/drivers/block/cciss.c b/drivers/block/cciss.c
index ca56a0e5cd5e..7c2cfde08f18 100644
--- a/drivers/block/cciss.c
+++ b/drivers/block/cciss.c
@@ -3076,15 +3076,20 @@ static int cciss_pci_init(ctlr_info_t *c, struct pci_dev *pdev)
}
#endif
- /* Disabling DMA prefetch for the P600
- * An ASIC bug may result in a prefetch beyond
- * physical memory.
+ /* Disabling DMA prefetch and refetch for the P600.
+ * An ASIC bug may result in accesses to invalid memory addresses.
+ * We've disabled prefetch for some time now. Testing with XEN
+ * kernels revealed a bug in the refetch if dom0 resides on a P600.
*/
if(board_id == 0x3225103C) {
__u32 dma_prefetch;
+ __u32 dma_refetch;
dma_prefetch = readl(c->vaddr + I2O_DMA1_CFG);
dma_prefetch |= 0x8000;
writel(dma_prefetch, c->vaddr + I2O_DMA1_CFG);
+ pci_read_config_dword(pdev, PCI_COMMAND_PARITY, &dma_refetch);
+ dma_refetch |= 0x1;
+ pci_write_config_dword(pdev, PCI_COMMAND_PARITY, dma_refetch);
}
#ifdef CCISS_DEBUG