There was a small window where a login or reconnect job could use an
already updated card generation with an outdated node ID. We have to
use the fw_device.generation here, not the fw_card.generation, because
the generation must never be newer than the node ID when we emit a
transaction. This cannot be guaranteed with fw_card.generation.
Furthermore, the target's and initiator's node IDs can be obtained from
fw_device and fw_card. Dereferencing their underlying topology objects
is not necessary.
Signed-off-by: Stefan Richter <[EMAIL PROTECTED]>
---
Rework of patch "firewire: fw-sbp2: enforce read order of device
generation and node ID" from November 1 2007.
This code also needs barriers to work precisely as intended. They will
be added by a subsequent patch which consistently updates readers and
writers of .generation and .node_id.
drivers/firewire/fw-sbp2.c | 12 ++++++------
1 file changed, 6 insertions(+), 6 deletions(-)
Index: linux/drivers/firewire/fw-sbp2.c
===================================================================
--- linux.orig/drivers/firewire/fw-sbp2.c
+++ linux/drivers/firewire/fw-sbp2.c
@@ -671,9 +671,9 @@ static void sbp2_login(struct work_struc
struct sbp2_login_response response;
int generation, node_id, local_node_id;
- generation = device->card->generation;
- node_id = device->node->node_id;
- local_node_id = device->card->local_node->node_id;
+ generation = device->generation;
+ node_id = device->node_id;
+ local_node_id = device->card->node_id;
if (sbp2_send_management_orb(lu, node_id, generation,
SBP2_LOGIN_REQUEST, lu->lun, &response) < 0) {
@@ -921,9 +921,9 @@ static void sbp2_reconnect(struct work_s
struct fw_device *device = fw_device(unit->device.parent);
int generation, node_id, local_node_id;
- generation = device->card->generation;
- node_id = device->node->node_id;
- local_node_id = device->card->local_node->node_id;
+ generation = device->generation;
+ node_id = device->node_id;
+ local_node_id = device->card->node_id;
if (sbp2_send_management_orb(lu, node_id, generation,
SBP2_RECONNECT_REQUEST,
--
Stefan Richter
-=====-==--- ---= ==---
http://arcgraph.de/sr/
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