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Fix bug in iwcm that caused a panic in iw_cm_wq when krping is run

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repeatedly in a tight loop.

Approved by:	re (gjb@)
Obtained from:	hselasky@ (part of larger changes in D5791)
This commit is contained in:
Navdeep Parhar 2016-06-14 20:58:05 +00:00
parent 2710e62c41
commit 9e2d05841e
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=301896
1 changed files with 11 additions and 2 deletions
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13
sys/ofed/drivers/infiniband/core/iwcm.c
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@ -266,9 +266,16 @@ static void add_ref(struct iw_cm_id *cm_id)
static void rem_ref(struct iw_cm_id *cm_id)
{
struct iwcm_id_private *cm_id_priv;
int cb_destroy;
cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
if (iwcm_deref_id(cm_id_priv) &&
test_bit(IWCM_F_CALLBACK_DESTROY, &cm_id_priv->flags)) {
/*
* Test bit before deref in case the cm_id gets freed on another
* thread.
*/
cb_destroy = test_bit(IWCM_F_CALLBACK_DESTROY, &cm_id_priv->flags);
if (iwcm_deref_id(cm_id_priv) && cb_destroy) {
BUG_ON(!list_empty(&cm_id_priv->work_list));
free_cm_id(cm_id_priv);
}
@ -1157,6 +1164,8 @@ static void cm_work_handler(struct work_struct *_work)
}
return;
}
if (empty)
return;
spin_lock_irqsave(&cm_id_priv->lock, flags);
}
spin_unlock_irqrestore(&cm_id_priv->lock, flags);