Fix bug in iwcm that caused a panic in iw_cm_wq when krping is run
repeatedly in a tight loop. Approved by: re (gjb@) Obtained from: hselasky@ (part of larger changes in D5791)
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2710e62c41
commit
9e2d05841e
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=301896
@ -266,9 +266,16 @@ static void add_ref(struct iw_cm_id *cm_id)
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static void rem_ref(struct iw_cm_id *cm_id)
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{
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struct iwcm_id_private *cm_id_priv;
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int cb_destroy;
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cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
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if (iwcm_deref_id(cm_id_priv) &&
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test_bit(IWCM_F_CALLBACK_DESTROY, &cm_id_priv->flags)) {
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/*
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* Test bit before deref in case the cm_id gets freed on another
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* thread.
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*/
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cb_destroy = test_bit(IWCM_F_CALLBACK_DESTROY, &cm_id_priv->flags);
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if (iwcm_deref_id(cm_id_priv) && cb_destroy) {
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BUG_ON(!list_empty(&cm_id_priv->work_list));
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free_cm_id(cm_id_priv);
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}
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@ -1157,6 +1164,8 @@ 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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