On Saturday 06 September 2008 21:59:55 Larry Finger wrote:
> Johannes Berg wrote:
> >
> > The mechanism depends on the card revision, but according to
> > drivers/net/wireless/b43legacy/dma.c it's always via the dma/pio
> > mechanism for legacy cards:
> >
> > if (dev->dev->id.revision < 5) {
> > ring = b43legacy_setup_dmaring(dev, 3, 0, type);
> > if (!ring)
> > goto err_destroy_rx0;
> > dma->rx_ring3 = ring;
> > }
>
> In the V3 specs, I found
>
> "Transmit Status
>
> When this interrupt is set, the retrieve the TransmitStatus. Note that
> on cores with revision < 5, the last DMA controller or PIO queue can
> also also get the DMA recieve done interrupt, which also triggers the
> TransmitStatus retrieval process. The driver should be prepared to
> deal with both interrupts at any time, on any revision. In AP mode,
> this interrupt also initiates the sending of powersave responses."
>
> The implication is that the interrupt will only be generated if we use
> the last (i.e. #5) DMA controller. As we are only using #3, no
> interrupts and handle_irq_status() is dead code.
Ok. I'm pretty sure that the current code is correct for the register
mechanism, _however_ it is dead code and will never be called for
b43legacy. So I'd suggest you just do something like this (manually-hacked
patch):
Index: wireless-testing/drivers/net/wireless/b43legacy/xmit.c
===================================================================
--- wireless-testing.orig/drivers/net/wireless/b43legacy/xmit.c
+++ wireless-testing/drivers/net/wireless/b43legacy/xmit.c
@@ -629,7 +629,7 @@ void b43legacy_handle_hwtxstatus(struct
.......
+ tmp <<= 1;
.......
status.pm_indicated = !!(tmp & 0x80);
status.intermediate = !!(tmp & 0x40);
status.for_ampdu = !!(tmp & 0x20);
status.acked = !!(tmp & 0x02);
b43legacy_handle_txstatus(dev, &status);
}
Just leave handle_irq_transmit_status as is.
--
Greetings Michael.
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