From: Hal Rosenstock Date: Wed, 27 Jul 2005 18:45:26 +0000 (-0700) Subject: [PATCH] IB: Fix timeout/cancelled MAD handling X-Git-Tag: v2.6.13-rc4~25^2~55 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6a0c435ef9e2473934442282054d0f58235d1de2;p=linux-2.6 [PATCH] IB: Fix timeout/cancelled MAD handling Fixes an issue processing a sent MAD after it has timed out or been canceled. The race occurs when a response MAD matches with the send request. The request could time out or be canceled after the response MAD matches with the request, but before the request completion can be processed. Signed-off-by: Sean Hefty Signed-off-by: Hal Rosenstock Cc: Roland Dreier Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/drivers/infiniband/core/mad.c b/drivers/infiniband/core/mad.c index d1898b30c3..7af8f7f878 100644 --- a/drivers/infiniband/core/mad.c +++ b/drivers/infiniband/core/mad.c @@ -341,6 +341,7 @@ struct ib_mad_agent *ib_register_mad_agent(struct ib_device *device, spin_lock_init(&mad_agent_priv->lock); INIT_LIST_HEAD(&mad_agent_priv->send_list); INIT_LIST_HEAD(&mad_agent_priv->wait_list); + INIT_LIST_HEAD(&mad_agent_priv->done_list); INIT_WORK(&mad_agent_priv->timed_work, timeout_sends, mad_agent_priv); INIT_LIST_HEAD(&mad_agent_priv->local_list); INIT_WORK(&mad_agent_priv->local_work, local_completions, @@ -1559,6 +1560,16 @@ find_send_req(struct ib_mad_agent_private *mad_agent_priv, return NULL; } +static void ib_mark_req_done(struct ib_mad_send_wr_private *mad_send_wr) +{ + mad_send_wr->timeout = 0; + if (mad_send_wr->refcount == 1) { + list_del(&mad_send_wr->agent_list); + list_add_tail(&mad_send_wr->agent_list, + &mad_send_wr->mad_agent_priv->done_list); + } +} + static void ib_mad_complete_recv(struct ib_mad_agent_private *mad_agent_priv, struct ib_mad_recv_wc *mad_recv_wc) { @@ -1580,8 +1591,7 @@ static void ib_mad_complete_recv(struct ib_mad_agent_private *mad_agent_priv, wake_up(&mad_agent_priv->wait); return; } - /* Timeout = 0 means that we won't wait for a response */ - mad_send_wr->timeout = 0; + ib_mark_req_done(mad_send_wr); spin_unlock_irqrestore(&mad_agent_priv->lock, flags); /* Defined behavior is to complete response before request */ diff --git a/drivers/infiniband/core/mad_priv.h b/drivers/infiniband/core/mad_priv.h index 96f1b5b610..6fcab0009b 100644 --- a/drivers/infiniband/core/mad_priv.h +++ b/drivers/infiniband/core/mad_priv.h @@ -92,6 +92,7 @@ struct ib_mad_agent_private { spinlock_t lock; struct list_head send_list; struct list_head wait_list; + struct list_head done_list; struct work_struct timed_work; unsigned long timeout; struct list_head local_list;