From: Bjorn Helgaas <[EMAIL PROTECTED]>
Apparently the Intel PRO/100 device enables interrupts on reset. Unless
firmware explicitly disables PRO/100 interrupts, we can get a flood of
interrupts when a driver attaches to an unrelated device that happens to
share the PRO/100 IRQ.
This should resolve this "irq 11: nobody cared" bug report:
http://bugzilla.kernel.org/show_bug.cgi?id=5918
Signed-off-by: Bjorn Helgaas <[EMAIL PROTECTED]>
Cc: Jesse Brandeburg <[EMAIL PROTECTED]>
Cc: Jeff Kirsher <[EMAIL PROTECTED]>
Cc: John Ronciak <[EMAIL PROTECTED]>
Cc: <[EMAIL PROTECTED]>
Cc: <[EMAIL PROTECTED]>
Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
---
drivers/pci/quirks.c | 57 +++++++++++++++++++++++++++++++++++++++++
1 files changed, 57 insertions(+)
diff -puN drivers/pci/quirks.c~e100-disable-interrupts-at-boot
drivers/pci/quirks.c
--- devel/drivers/pci/quirks.c~e100-disable-interrupts-at-boot 2006-04-14
23:41:34.000000000 -0700
+++ devel-akpm/drivers/pci/quirks.c 2006-04-14 23:41:34.000000000 -0700
@@ -1374,6 +1374,63 @@ static void __devinit quirk_netmos(struc
}
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NETMOS, PCI_ANY_ID, quirk_netmos);
+static void __devinit quirk_e100_interrupt(struct pci_dev *dev)
+{
+ u16 command;
+ u32 bar;
+ u8 __iomem *csr;
+ u8 cmd_hi;
+
+ switch (dev->device) {
+ /* PCI IDs taken from drivers/net/e100.c */
+ case 0x1029:
+ case 0x1030 ... 0x1034:
+ case 0x1038 ... 0x103E:
+ case 0x1050 ... 0x1057:
+ case 0x1059:
+ case 0x1064 ... 0x106B:
+ case 0x1091 ... 0x1095:
+ case 0x1209:
+ case 0x1229:
+ case 0x2449:
+ case 0x2459:
+ case 0x245D:
+ case 0x27DC:
+ break;
+ default:
+ return;
+ }
+
+ /*
+ * Some firmware hands off the e100 with interrupts enabled,
+ * which can cause a flood of interrupts if packets are
+ * received before the driver attaches to the device. So
+ * disable all e100 interrupts here. The driver will
+ * re-enable them when it's ready.
+ */
+ pci_read_config_word(dev, PCI_COMMAND, &command);
+ pci_read_config_dword(dev, PCI_BASE_ADDRESS_0, &bar);
+
+ if (!(command & PCI_COMMAND_MEMORY) || !bar)
+ return;
+
+ csr = ioremap(bar, 8);
+ if (!csr) {
+ printk(KERN_WARNING "PCI: Can't map %s e100 registers\n",
+ pci_name(dev));
+ return;
+ }
+
+ cmd_hi = readb(csr + 3);
+ if (cmd_hi == 0) {
+ printk(KERN_WARNING "PCI: Firmware left %s e100 interrupts "
+ "enabled, disabling\n", pci_name(dev));
+ writeb(1, csr + 3);
+ }
+
+ iounmap(csr);
+}
+DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_INTEL, PCI_ANY_ID, quirk_e100_interrupt);
static void __devinit fixup_rev1_53c810(struct pci_dev* dev)
{
_
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