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Subject[PATCH] Fix MSI-X setup
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Date
msix_capability_init() puts the offset of the MSI-X capability into
pos, then uses pos as a loop index to clear the MSI-X vector table,
and then tries to use pos as the offset again, which results in
writing the MSI-X enable bit off into space.

This patch fixes that by adding a new loop index variable and using
that to clear the vector table.

- Roland

Signed-off-by: Roland Dreier <roland@tospin.com>

Index: linux-2.6.7/drivers/pci/msi.c
===================================================================
--- linux-2.6.7.orig/drivers/pci/msi.c 2004-06-21 20:51:33.000000000 -0700
+++ linux-2.6.7/drivers/pci/msi.c 2004-06-21 21:30:05.000000000 -0700
@@ -569,7 +569,7 @@
struct msi_desc *entry;
struct msg_address address;
struct msg_data data;
- int vector = 0, pos, dev_msi_cap;
+ int vector = 0, pos, dev_msi_cap, i;
u32 phys_addr, table_offset;
u32 control;
u8 bir;
@@ -629,12 +629,12 @@
writel(address.hi_address, base + PCI_MSIX_ENTRY_UPPER_ADDR_OFFSET);
writel(*(u32*)&data, base + PCI_MSIX_ENTRY_DATA_OFFSET);
/* Initialize all entries from 1 up to 0 */
- for (pos = 1; pos < dev_msi_cap; pos++) {
- writel(0, base + pos * PCI_MSIX_ENTRY_SIZE +
+ for (i = 1; i < dev_msi_cap; i++) {
+ writel(0, base + i * PCI_MSIX_ENTRY_SIZE +
PCI_MSIX_ENTRY_LOWER_ADDR_OFFSET);
- writel(0, base + pos * PCI_MSIX_ENTRY_SIZE +
+ writel(0, base + i * PCI_MSIX_ENTRY_SIZE +
PCI_MSIX_ENTRY_UPPER_ADDR_OFFSET);
- writel(0, base + pos * PCI_MSIX_ENTRY_SIZE +
+ writel(0, base + i * PCI_MSIX_ENTRY_SIZE +
PCI_MSIX_ENTRY_DATA_OFFSET);
}
attach_msi_entry(entry, vector);
-
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