From 0e56d99a5b557c760394d6941d7d1fc8d279eff3 Mon Sep 17 00:00:00 2001 From: David Woodhouse Date: Wed, 28 Nov 2012 00:05:52 +0000 Subject: pppoatm: fix missing wakeup in pppoatm_send() Now that we can return zero from pppoatm_send() for reasons *other* than the queue being full, that means we can't depend on a subsequent call to pppoatm_pop() waking the queue, and we might leave it stalled indefinitely. Use the ->release_cb() callback to wake the queue after the sock is unlocked. Signed-off-by: David Woodhouse Acked-by: Krzysztof Mazur --- net/atm/pppoatm.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) (limited to 'net/atm') diff --git a/net/atm/pppoatm.c b/net/atm/pppoatm.c index 3dce84af5dbe..9fcda8c85e9a 100644 --- a/net/atm/pppoatm.c +++ b/net/atm/pppoatm.c @@ -60,6 +60,7 @@ struct pppoatm_vcc { struct atm_vcc *atmvcc; /* VCC descriptor */ void (*old_push)(struct atm_vcc *, struct sk_buff *); void (*old_pop)(struct atm_vcc *, struct sk_buff *); + void (*old_release_cb)(struct atm_vcc *); struct module *old_owner; /* keep old push/pop for detaching */ enum pppoatm_encaps encaps; @@ -108,6 +109,14 @@ static void pppoatm_wakeup_sender(unsigned long arg) ppp_output_wakeup((struct ppp_channel *) arg); } +static void pppoatm_release_cb(struct atm_vcc *atmvcc) +{ + struct pppoatm_vcc *pvcc = atmvcc_to_pvcc(atmvcc); + + tasklet_schedule(&pvcc->wakeup_tasklet); + if (pvcc->old_release_cb) + pvcc->old_release_cb(atmvcc); +} /* * This gets called every time the ATM card has finished sending our * skb. The ->old_pop will take care up normal atm flow control, @@ -152,6 +161,7 @@ static void pppoatm_unassign_vcc(struct atm_vcc *atmvcc) pvcc = atmvcc_to_pvcc(atmvcc); atmvcc->push = pvcc->old_push; atmvcc->pop = pvcc->old_pop; + atmvcc->release_cb = pvcc->old_release_cb; tasklet_kill(&pvcc->wakeup_tasklet); ppp_unregister_channel(&pvcc->chan); atmvcc->user_back = NULL; @@ -388,6 +398,7 @@ static int pppoatm_assign_vcc(struct atm_vcc *atmvcc, void __user *arg) pvcc->old_push = atmvcc->push; pvcc->old_pop = atmvcc->pop; pvcc->old_owner = atmvcc->owner; + pvcc->old_release_cb = atmvcc->release_cb; pvcc->encaps = (enum pppoatm_encaps) be.encaps; pvcc->chan.private = pvcc; pvcc->chan.ops = &pppoatm_ops; @@ -403,6 +414,7 @@ static int pppoatm_assign_vcc(struct atm_vcc *atmvcc, void __user *arg) atmvcc->user_back = pvcc; atmvcc->push = pppoatm_push; atmvcc->pop = pppoatm_pop; + atmvcc->release_cb = pppoatm_release_cb; __module_get(THIS_MODULE); atmvcc->owner = THIS_MODULE; -- cgit v1.2.3-58-ga151