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IPoIB/cm: Don't crash if remote side uses one QP for both directions

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The IPoIB CM spec allows the use of a single connection in both
active->passive and passive->active directions.  The current Linux
code uses one connection for both directions, but if another node only
uses one connection for both directions, we oops when we try to look
up the passive connection.  Fix by checking that qp_context is
non-NULL before dereferencing it.

Signed-off-by: Michael S. Tsirkin <mst@dev.mellanox.co.il>
This commit is contained in:
Michael S. Tsirkin 2007-05-02 15:31:12 +03:00 committed by Roland Dreier
parent aff9e39d97
commit d6ef7d68f6
1 changed files with 1 additions and 1 deletions
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drivers/infiniband/ulp/ipoib/ipoib_cm.c
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@ -370,7 +370,7 @@ void ipoib_cm_handle_rx_wc(struct net_device *dev, struct ib_wc *wc)
if (!likely(wr_id & IPOIB_CM_RX_UPDATE_MASK)) {
p = wc->qp->qp_context;
if (time_after_eq(jiffies, p->jiffies + IPOIB_CM_RX_UPDATE_TIME)) {
if (p && time_after_eq(jiffies, p->jiffies + IPOIB_CM_RX_UPDATE_TIME)) {
spin_lock_irqsave(&priv->lock, flags);
p->jiffies = jiffies;
/* Move this entry to list head, but do