1 files changed, 9 insertions, 0 deletions

diff --git a/drivers/firewire/ohci.c b/drivers/firewire/ohci.c
index ecddd11b797a..3486bc49c177 100644
--- a/drivers/firewire/ohci.c
+++ b/drivers/firewire/ohci.c
@@ -34,6 +34,7 @@
 #include <linux/module.h>
 #include <linux/moduleparam.h>
 #include <linux/pci.h>
+#include <linux/pci_ids.h>
 #include <linux/spinlock.h>
 #include <linux/string.h>
 
@@ -2372,6 +2373,9 @@ static void ohci_pmac_off(struct pci_dev *dev)
 #define ohci_pmac_off(dev)
 #endif /* CONFIG_PPC_PMAC */
 
+#define PCI_VENDOR_ID_AGERE             PCI_VENDOR_ID_ATT
+#define PCI_DEVICE_ID_AGERE_FW643       0x5901
+
 static int __devinit pci_probe(struct pci_dev *dev,
                                const struct pci_device_id *ent)
 {
@@ -2422,6 +2426,11 @@ static int __devinit pci_probe(struct pci_dev *dev,
         version = reg_read(ohci, OHCI1394_Version) & 0x00ff00ff;
         ohci->use_dualbuffer = version >= OHCI_VERSION_1_1;
 
+        /* dual-buffer mode is broken if more than one IR context is active */
+        if (dev->vendor == PCI_VENDOR_ID_AGERE &&
+            dev->device == PCI_DEVICE_ID_AGERE_FW643)
+                ohci->use_dualbuffer = false;
+
 /* x86-32 currently doesn't use highmem for dma_alloc_coherent */
 #if !defined(CONFIG_X86_32)
         /* dual-buffer mode is broken with descriptor addresses above 2G */