diff options
| author | Karsten Keil <keil@b1-systems.de> | 2009-06-09 14:38:39 +0200 |
|---|---|---|
| committer | Karsten Keil <keil@b1-systems.de> | 2009-06-11 19:05:18 +0200 |
| commit | 8164491dd628ffcac5d61267f747997689ee256c (patch) | |
| tree | 146094cf95bb3a57708cb1f302c6cf5580c5a4ba /drivers | |
| parent | drivers/isdn/i4l/isdn_tty.c: fix check for array overindexing (diff) | |
| download | linux-8164491dd628ffcac5d61267f747997689ee256c.tar.xz linux-8164491dd628ffcac5d61267f747997689ee256c.zip | |
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 <keil@b1-systems.de>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/isdn/mISDN/tei.c | 7 |
1 files changed, 2 insertions, 5 deletions
diff --git a/drivers/isdn/mISDN/tei.c b/drivers/isdn/mISDN/tei.c index bfcdd97df95d..e04bad6c5baf 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; } |