netdev - Re: [PATCH net] net: dsa: mv88e6xxx: fix lockup on warm boot

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Message-Id: <20200229.214656.1463089628684062690.davem@davemloft.net>
Date:   Sat, 29 Feb 2020 21:46:56 -0800 (PST)
From:   David Miller <davem@...emloft.net>
To:     rmk+kernel@...linux.org.uk
Cc:     andrew@...n.ch, f.fainelli@...il.com, vivien.didelot@...il.com,
        netdev@...r.kernel.org
Subject: Re: [PATCH net] net: dsa: mv88e6xxx: fix lockup on warm boot

From: Russell King <rmk+kernel@...linux.org.uk>
Date: Fri, 28 Feb 2020 19:39:41 +0000

> If the switch is not hardware reset on a warm boot, interrupts can be
> left enabled, and possibly pending. This will cause us to enter an
> infinite loop trying to service an interrupt we are unable to handle,
> thereby preventing the kernel from booting.
> 
> Ensure that the global 2 interrupt sources are disabled before we claim
> the parent interrupt.
> 
> Observed on the ZII development revision B and C platforms with
> reworked serdes support, and using reboot -f to reboot the platform.
> 
> Fixes: dc30c35be720 ("net: dsa: mv88e6xxx: Implement interrupt support.")
> Signed-off-by: Russell King <rmk+kernel@...linux.org.uk>

Applied and queued up for -stable, thanks.