Hi Guennadi,
On Sat, Apr 07, 2007 at 03:59:26AM +0300, Samuel Ortiz wrote:
> IMHO, irnet_flow_indication() should be called asynchronously by
> irttp_run_tx_queue(), through some bottom-half mechanism. That would fix your
> locking issues, and that would reduce the time we spend in the IrDA code with
> this lock taken.
>
> I will try to come up with some patches for you later this weekend.
The patch below schedules irnet_flow_indication() asynchronously. Could
you please give it a try (it builds, but I couldn't test it...) ? :
diff --git a/include/net/irda/irttp.h b/include/net/irda/irttp.h
index a899e58..941f0f1 100644
--- a/include/net/irda/irttp.h
+++ b/include/net/irda/irttp.h
@@ -128,6 +128,7 @@ struct tsap_cb {
struct net_device_stats stats;
struct timer_list todo_timer;
+ struct work_struct irnet_flow_work; /* irttp asynchronous flow
restart */
__u32 max_seg_size; /* Max data that fit into an IrLAP frame */
__u8 max_header_size;
diff --git a/net/irda/irnet/irnet.h b/net/irda/irnet/irnet.h
diff --git a/net/irda/irttp.c b/net/irda/irttp.c
index 7069e4a..a0d0f26 100644
--- a/net/irda/irttp.c
+++ b/net/irda/irttp.c
@@ -367,6 +367,29 @@ static int irttp_param_max_sdu_size(void *instance,
irda_param_t *param,
/*************************** CLIENT CALLS ***************************/
/************************** LMP CALLBACKS **************************/
/* Everything is happily mixed up. Waiting for next clean up - Jean II */
+static void irttp_flow_restart(struct work_struct *work)
+{
+ struct tsap_cb * self =
+ container_of(work, struct tsap_cb, irnet_flow_work);
+
+ if (self == NULL)
+ return;
+
+ /* Check if we can accept more frames from client. */
+ if ((self->tx_sdu_busy) &&
+ (skb_queue_len(&self->tx_queue) < TTP_TX_LOW_THRESHOLD) &&
+ (!self->close_pend)) {
+ if (self->notify.flow_indication)
+ self->notify.flow_indication(self->notify.instance,
+ self, FLOW_START);
+
+ /* self->tx_sdu_busy is the state of the client.
+ * We don't really have a race here, but it's always safer
+ * to update our state after the client - Jean II */
+ self->tx_sdu_busy = FALSE;
+ }
+}
+
/*
* Function irttp_open_tsap (stsap, notify)
@@ -402,6 +425,8 @@ struct tsap_cb *irttp_open_tsap(__u8 stsap_sel, int credit,
notify_t *notify)
self->todo_timer.data = (unsigned long) self;
self->todo_timer.function = &irttp_todo_expired;
+ INIT_WORK(&self->irnet_flow_work, irttp_flow_restart);
+
/* Initialize callbacks for IrLMP to use */
irda_notify_init(&ttp_notify);
ttp_notify.connect_confirm = irttp_connect_confirm;
@@ -761,25 +786,10 @@ static void irttp_run_tx_queue(struct tsap_cb *self)
self->stats.tx_packets++;
}
- /* Check if we can accept more frames from client.
- * We don't want to wait until the todo timer to do that, and we
- * can't use tasklets (grr...), so we are obliged to give control
- * to client. That's ok, this test will be true not too often
- * (max once per LAP window) and we are called from places
- * where we can spend a bit of time doing stuff. - Jean II */
if ((self->tx_sdu_busy) &&
(skb_queue_len(&self->tx_queue) < TTP_TX_LOW_THRESHOLD) &&
(!self->close_pend))
- {
- if (self->notify.flow_indication)
- self->notify.flow_indication(self->notify.instance,
- self, FLOW_START);
-
- /* self->tx_sdu_busy is the state of the client.
- * We don't really have a race here, but it's always safer
- * to update our state after the client - Jean II */
- self->tx_sdu_busy = FALSE;
- }
+ schedule_work(&self->irnet_flow_work);
/* Reset lock */
self->tx_queue_lock = 0;
-
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