Francois Romieu <rom...@fr.zoreil.com> wrote:
> Florian Westphal <f...@strlen.de> :
> [...]
> > diff --git a/drivers/net/ethernet/atheros/atl1c/atl1c_main.c
> > b/drivers/net/ethernet/atheros/atl1c/atl1c_main.c
> > index d0084d4..a3200ea 100644
> > --- a/drivers/net/ethernet/atheros/atl1c/atl1c_main.c
> > +++ b/drivers/net/ethernet/atheros/atl1c/atl1c_main.c
> [...]
> > @@ -2217,16 +2215,10 @@ static netdev_tx_t atl1c_xmit_frame(struct sk_buff
> > *skb,
> > }
> >
> > tpd_req = atl1c_cal_tpd_req(skb);
> > - if (!spin_trylock_irqsave(&adapter->tx_lock, flags)) {
> > - if (netif_msg_pktdata(adapter))
> > - dev_info(&adapter->pdev->dev, "tx locked\n");
> > - return NETDEV_TX_LOCKED;
> > - }
> >
> > if (atl1c_tpd_avail(adapter, type) < tpd_req) {
> > /* no enough descriptor, just stop queue */
> > netif_stop_queue(netdev);
> > - spin_unlock_irqrestore(&adapter->tx_lock, flags);
> > return NETDEV_TX_BUSY;
> > }
> >
>
> Play it safe and keep the implicit local_irq_{save / restore} call ?
>
> It may not be needed but it will help avoiding any unexpected regression
> report pointing at the NETDEV_TX_LOCKED removal change.
I thought about that but it doesn't prevent the irq handler from
running on another CPU, so leaving it around seemed like cargo culting
to me...
I don't have an atl1c, but the atl1e in my laptop seems to work fine
with the (similar) change.
If you disagree I can respin with local_irq_save of course, but, if
'playing it safe' is main goal then its simpler to convert
spin_trylock_irqsave to spin_lock_irqsave.
