From b5d2a5e04e6a26cb3f77af8cbc31e74c361d706c Mon Sep 17 00:00:00 2001 From: Stefan Richter Date: Fri, 25 Jan 2008 18:57:41 +0100 Subject: firewire: enforce access order between generation and node ID, fix "giving up on config rom" MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit fw_device.node_id and fw_device.generation are accessed without mutexes. We have to ensure that all readers will get to see node_id updates before generation updates. Fixes an inability to recognize devices after "giving up on config rom", https://bugzilla.redhat.com/show_bug.cgi?id=429950 Signed-off-by: Stefan Richter Reviewed by Nick Piggin . Verified to fix 'giving up on config rom' issues on multiple system and drive combinations that were previously affected. Signed-off-by: Jarod Wilson Signed-off-by: Kristian Høgsberg --- drivers/firewire/fw-sbp2.c | 3 +++ 1 file changed, 3 insertions(+) (limited to 'drivers/firewire/fw-sbp2.c') diff --git a/drivers/firewire/fw-sbp2.c b/drivers/firewire/fw-sbp2.c index d406c34fd37..705a20ce6b4 100644 --- a/drivers/firewire/fw-sbp2.c +++ b/drivers/firewire/fw-sbp2.c @@ -40,6 +40,7 @@ #include #include #include +#include #include #include @@ -662,6 +663,7 @@ static void sbp2_login(struct work_struct *work) int generation, node_id, local_node_id; generation = device->generation; + smp_rmb(); /* node_id must not be older than generation */ node_id = device->node_id; local_node_id = device->card->node_id; @@ -912,6 +914,7 @@ static void sbp2_reconnect(struct work_struct *work) int generation, node_id, local_node_id; generation = device->generation; + smp_rmb(); /* node_id must not be older than generation */ node_id = device->node_id; local_node_id = device->card->node_id; -- cgit v1.2.3