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authorHal Rosenstock <halr@voltaire.com>2005-07-27 11:45:26 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2005-07-27 16:26:10 -0700
commit6a0c435ef9e2473934442282054d0f58235d1de2 (patch)
tree71a5d054bde7447f10c611e359ecbcc36462a312
parentd760ce8f71ec5336c4a750a1293f26c0eb938c8a (diff)
downloadop-kernel-dev-6a0c435ef9e2473934442282054d0f58235d1de2.zip
op-kernel-dev-6a0c435ef9e2473934442282054d0f58235d1de2.tar.gz
[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 <sean.hefty@intel.com> Signed-off-by: Hal Rosenstock <halr@voltaire.com> Cc: Roland Dreier <rolandd@cisco.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
-rw-r--r--drivers/infiniband/core/mad.c14
-rw-r--r--drivers/infiniband/core/mad_priv.h1
2 files changed, 13 insertions, 2 deletions
diff --git a/drivers/infiniband/core/mad.c b/drivers/infiniband/core/mad.c
index d1898b3..7af8f7f 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 96f1b5b..6fcab00 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;
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