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authorStefan Richter <stefanr@s5r6.in-berlin.de>2008-03-19 21:40:32 +0100
committerStefan Richter <stefanr@s5r6.in-berlin.de>2008-04-18 17:55:33 +0200
commitc8a9a498e16b2a6c0e4e367b1a01f80fdfd7b6e2 (patch)
treef8e7fdab0bc3eefc98d6c0a09ab02337b6090371 /drivers
parent2ed0f181f0d18d2f565bfbd259fe33d53769f72b (diff)
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>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/firewire/fw-ohci.c14
-rw-r--r--drivers/firewire/fw-ohci.h1
2 files changed, 11 insertions, 4 deletions
diff --git a/drivers/firewire/fw-ohci.c b/drivers/firewire/fw-ohci.c
index 92ff38f82d9..1f6f15f0dce 100644
--- a/drivers/firewire/fw-ohci.c
+++ b/drivers/firewire/fw-ohci.c
@@ -1019,20 +1019,26 @@ static void bus_reset_tasklet(unsigned long data)
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]);
}
diff --git a/drivers/firewire/fw-ohci.h b/drivers/firewire/fw-ohci.h
index dec4f04e6b2..5754c6e9d59 100644
--- a/drivers/firewire/fw-ohci.h
+++ b/drivers/firewire/fw-ohci.h
@@ -30,6 +30,7 @@
#define OHCI1394_HCControl_softReset 0x00010000
#define OHCI1394_SelfIDBuffer 0x064
#define OHCI1394_SelfIDCount 0x068
+#define OHCI1394_SelfIDCount_selfIDError 0x80000000
#define OHCI1394_IRMultiChanMaskHiSet 0x070
#define OHCI1394_IRMultiChanMaskHiClear 0x074
#define OHCI1394_IRMultiChanMaskLoSet 0x078