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Message-ID: <20130502123727.GA17149@linutronix.de>
Date: Thu, 2 May 2013 14:37:27 +0200
From: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To: Mugunthan V N <mugunthanvnm@...com>
Cc: netdev@...r.kernel.org, davem@...emloft.net,
linux-omap@...r.kernel.org
Subject: Re: [net-next PATCH 1/1] drivers: net: cpsw: irq not disabled in
cpsw isr in particular sequence
* Mugunthan V N | 2013-05-02 17:22:11 [+0530]:
>In CPSW NAPI, after processing all interrupts IRQ is enabled and then book
>keeping irq_enabled is updated. In random cases when a packet is transmitted
>or received between processing packets and IRQ enabled, then just after
>enabled IRQ and before irq_enabled is updated, ISR is called so IRQs are
>not disabled as irq_enabled is still false and CPU gets locked in CPSW ISR.
>
>By changing the sequence as update the irq_enabled and then enable IRQ
>fixes the issue. This issue is not captured always as it is a timing issue
>whether Tx or Rx IRQ is invoked between packet processing and enable IRQ.
Acked-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Sebastian
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