From 8164491dd628ffcac5d61267f747997689ee256c Mon Sep 17 00:00:00 2001 From: Karsten Keil Date: Tue, 9 Jun 2009 14:38:39 +0200 Subject: mISDN: Do not disable IRQ in ph_data_ind() This fix triggering the WARN_ON_ONCE(in_irq() || irqs_disabled()); in local_bh_enable(). Here is no need to grab this lock, this was wrong at all and may cause a deadlock and access to freed memory, since on a TEI remove the current listelement can be deleted under us. So this is clearly a case for list_for_each_entry_safe. Signed-off-by: Karsten Keil --- drivers/isdn/mISDN/tei.c | 7 ++----- 1 file changed, 2 insertions(+), 5 deletions(-) diff --git a/drivers/isdn/mISDN/tei.c b/drivers/isdn/mISDN/tei.c index bfcdd97..e04bad6 100644 --- a/drivers/isdn/mISDN/tei.c +++ b/drivers/isdn/mISDN/tei.c @@ -862,8 +862,7 @@ static int ph_data_ind(struct manager *mgr, struct sk_buff *skb) { int ret = -EINVAL; - struct layer2 *l2; - u_long flags; + struct layer2 *l2, *nl2; u_char mt; if (skb->len < 8) { @@ -908,11 +907,9 @@ ph_data_ind(struct manager *mgr, struct sk_buff *skb) new_tei_req(mgr, &skb->data[4]); goto done; } - read_lock_irqsave(&mgr->lock, flags); - list_for_each_entry(l2, &mgr->layer2, list) { + list_for_each_entry_safe(l2, nl2, &mgr->layer2, list) { tei_ph_data_ind(l2->tm, mt, &skb->data[4], skb->len - 4); } - read_unlock_irqrestore(&mgr->lock, flags); done: return ret; } -- cgit v1.1