From: Ralph Campbell Date: Thu, 20 Sep 2007 23:33:44 +0000 (-0700) Subject: IB/core: Fix handling of multicast response failures X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=57cb61d587e990d556385d367589ff61f6c2c0f2;p=GitHub%2Fmt8127%2Fandroid_kernel_alcatel_ttab.git IB/core: Fix handling of multicast response failures I was looking at the code for multicast.c and noticed that ib_sa_join_multicast() calls queue_join() which puts the request at the front of the group->pending_list. If this is a second request, it seems like it would interfere with process_join_error() since group->last_join won't point to the member at the head of the pending_list. The sequence would thus be: 1. ib_sa_join_multicast() puts member1 on head of pending_list and starts work thread 2. mcast_work_handler() calls send_join() which sets group->last_join to member1 3. ib_sa_join_multicast() puts member2 on head of pending_list 4. join operation for member1 receives failures response from SA. 5. join_handler() is called with error status 6. process_join_error() fails to process member1 since it doesn't match the first entry in the group->pending_list. The impact is that the failed join request is tossed. The second request is processed, and after it completes, the original request ends up being retried. This change also results in join requests being processed in FIFO order. Signed-off-by: Ralph Campbell Signed-off-by: Sean Hefty Signed-off-by: Roland Dreier --- diff --git a/drivers/infiniband/core/multicast.c b/drivers/infiniband/core/multicast.c index 15b4c4d3606d..1bc1fe605282 100644 --- a/drivers/infiniband/core/multicast.c +++ b/drivers/infiniband/core/multicast.c @@ -196,7 +196,7 @@ static void queue_join(struct mcast_member *member) unsigned long flags; spin_lock_irqsave(&group->lock, flags); - list_add(&member->list, &group->pending_list); + list_add_tail(&member->list, &group->pending_list); if (group->state == MCAST_IDLE) { group->state = MCAST_BUSY; atomic_inc(&group->refcount);