firewire: fw-ohci: add self ID error check
Discard self ID buffer contents if
- the selfIDError flag is set,
- any of the self ID packets has bit errors.
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Signed-off-by: Jarod Wilson <jwilson@redhat.com>
diff --git a/drivers/firewire/fw-ohci.c b/drivers/firewire/fw-ohci.c
index 92ff38f..1f6f15f 100644
--- a/drivers/firewire/fw-ohci.c
+++ b/drivers/firewire/fw-ohci.c
@@ -1019,20 +1019,26 @@
ohci->node_id = reg & (OHCI1394_NodeID_busNumber |
OHCI1394_NodeID_nodeNumber);
+ reg = reg_read(ohci, OHCI1394_SelfIDCount);
+ if (reg & OHCI1394_SelfIDCount_selfIDError) {
+ fw_notify("inconsistent self IDs\n");
+ return;
+ }
/*
* The count in the SelfIDCount register is the number of
* bytes in the self ID receive buffer. Since we also receive
* the inverted quadlets and a header quadlet, we shift one
* bit extra to get the actual number of self IDs.
*/
-
- self_id_count = (reg_read(ohci, OHCI1394_SelfIDCount) >> 3) & 0x3ff;
+ self_id_count = (reg >> 3) & 0x3ff;
generation = (cond_le32_to_cpu(ohci->self_id_cpu[0]) >> 16) & 0xff;
rmb();
for (i = 1, j = 0; j < self_id_count; i += 2, j++) {
- if (ohci->self_id_cpu[i] != ~ohci->self_id_cpu[i + 1])
- fw_error("inconsistent self IDs\n");
+ if (ohci->self_id_cpu[i] != ~ohci->self_id_cpu[i + 1]) {
+ fw_notify("inconsistent self IDs\n");
+ return;
+ }
ohci->self_id_buffer[j] =
cond_le32_to_cpu(ohci->self_id_cpu[i]);
}