netdev - Re: [PATCH] r8169: Fix irq masking in rtl8169

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Message-Id: <200903180256.26626.fzu@wemgehoertderstaat.de>
Date:	Wed, 18 Mar 2009 02:56:26 +0100
From:	Karsten Wiese <fzu@...gehoertderstaat.de>
To:	Francois Romieu <romieu@...zoreil.com>
Cc:	netdev@...r.kernel.org, Rafael Wysocki <rjw@...k.pl>
Subject: Re: [PATCH] r8169: Fix irq masking in rtl8169_interrupt()

Am Dienstag 17 März 2009 schrieb Francois Romieu:
> Karsten Wiese <fzu@...gehoertderstaat.de> :
> > 
> > Only adjust the NAPI bits of the interruptmask, if netif_rx_schedule_prep()
> > returns true.
> > Without this, I see interrupt storms here using 2.6.29-rcx and 2.6.27.19 and
> > device needed rmmod r8169 + modprobe r8169 to start working.
> 
> How the patch is supposed to work is not completely clear to me.

Without it, if netif_rx_schedule_prep() returns 0, __netif_rx_schedule() is not
called so nothing is there to care for the transfer. Nonetheless intr_mask is 
changed so that its not possible that __netif_rx_schedule() is ever called
later.

Patch works by letting rtl8169_interrupt() again call netif_rx_schedule_prep()
until it succeeds and __netif_rx_schedule() is called.

Thanks,
Karsten
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