netdev - Re: [PATCH net-next] tg3: Prevent system hang during repeated EEH errors.

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Message-ID: <20130617185647.GB12442@d2.synalogic.ca>
Date:	Mon, 17 Jun 2013 14:56:47 -0400
From:	Benjamin Poirier <benjamin.poirier@...il.com>
To:	Nithin Nayak Sujir <nsujir@...adcom.com>
Cc:	davem@...emloft.net, netdev@...r.kernel.org,
	Michael Chan <mchan@...adcom.com>
Subject: Re: [PATCH net-next] tg3: Prevent system hang during repeated EEH
 errors.

On 2013/06/17 14:28, Benjamin Poirier wrote:
> On 2013/06/14 14:15, Nithin Nayak Sujir wrote:
> [...]
> > @@ -17796,6 +17799,10 @@ static pci_ers_result_t tg3_io_slot_reset(struct pci_dev *pdev)
> >  	rc = PCI_ERS_RESULT_RECOVERED;
> >  
> >  done:
> > +	if (rc != PCI_ERS_RESULT_RECOVERED && netif_running(netdev)) {
> > +		tg3_napi_enable(tp);
> > +		dev_close(netdev);
> > +	}
> >  	rtnl_unlock();
> >  
> >  	return rc;
> > @@ -17826,6 +17833,8 @@ static void tg3_io_resume(struct pci_dev *pdev)
> >  	if (err) {
> >  		tg3_full_unlock(tp);
> >  		netdev_err(netdev, "Cannot restart hardware after reset.\n");
> > +		tg3_napi_enable(tp);
> > +		dev_close(netdev);
> >  		goto done;
> >  	}
> 
> Are these two hunks needed?
> 1) These functions do not call tg3_netif_stop() or tg3_napi_disable()

Ok, I see why this is relevant, since the slot_reset and resume
callbacks are always called after the error_detected callback.

> 2) an error in tg3_io_resume() does not trigger device removal in
> handle_eeh_events(). In fact the ->resume callback has no return value.

Nevertheless, this hunk

> > @@ -17826,6 +17833,8 @@ static void tg3_io_resume(struct pci_dev *pdev)
> >  	if (err) {
> >  		tg3_full_unlock(tp);
> >  		netdev_err(netdev, "Cannot restart hardware after reset.\n");
> > +		tg3_napi_enable(tp);
> > +		dev_close(netdev);
> >  		goto done;
> >  	}

duplicates the error handling code already in tg3_restart_hw().

> 
> >  
> > -- 
> > 1.8.1.4
> > 
> > 
> > --
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