[patch 17/22] ieee1394: add quirk fix for Freecom HDD

[Greg KH]

2.6.27-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Stefan Richter <stefanr@xxxxxxxxxxxxxxxxx>

commit 25a41b280083259d05d68f61633194344a1f8a9f upstream.

According to http://bugzilla.kernel.org/show_bug.cgi?id=12206, Freecom
FireWire Hard Drive 1TB reports max_rom=2 but returns garbage if block
read requests are used to read the config ROM.  Force max_rom=0 to limit
them to quadlet read requests.

Reported-by: Christian Mueller <cm1@xxxxxxxx>
Signed-off-by: Stefan Richter <stefanr@xxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

---
 drivers/ieee1394/nodemgr.c |    6 ++++++
 1 file changed, 6 insertions(+)

--- a/drivers/ieee1394/nodemgr.c
+++ b/drivers/ieee1394/nodemgr.c
@@ -115,8 +115,14 @@ static int nodemgr_bus_read(struct csr12
 	return error;
 }
 
+#define OUI_FREECOM_TECHNOLOGIES_GMBH 0x0001db
+
 static int nodemgr_get_max_rom(quadlet_t *bus_info_data, void *__ci)
 {
+	/* Freecom FireWire Hard Drive firmware bug */
+	if (be32_to_cpu(bus_info_data[3]) >> 8 == OUI_FREECOM_TECHNOLOGIES_GMBH)
+		return 0;
+
 	return (be32_to_cpu(bus_info_data[2]) >> 8) & 0x3;
 }
 

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