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RDMA/iwcm: Don't touch cmid after dropping reference
The function cm_work_handler() cannot touch the cm_id after it derefs it, because it might be freed on another concurrent thread. If there are more work items queued for this cm_id, then we know there must be more references because they are added when the work items are queued. So in the while loop inside cm_work_handler(), after derefing, if the queue is empty, then exit the function. Otherwise we know it's safe to re-acquire the lock. Signed-off-by: Steve Wise <swise@opengridcomputing.com> Signed-off-by: Roland Dreier <roland@purestorage.com>
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@ -878,6 +878,8 @@ static void cm_work_handler(struct work_struct *_work)
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}
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return;
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}
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if (empty)
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return;
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spin_lock_irqsave(&cm_id_priv->lock, flags);
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}
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spin_unlock_irqrestore(&cm_id_priv->lock, flags);
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