netdev - Re: [PATCH] ibmvnic: Clear pending interrupt after device reset

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Date:   Sun, 15 Apr 2018 20:55:12 -0400 (EDT)
From:   David Miller <davem@...emloft.net>
To:     tlfalcon@...ux.vnet.ibm.com
Cc:     netdev@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        jallen@...ux.vnet.ibm.com, nfont@...ux.vnet.ibm.com,
        benh@...nel.crashing.org
Subject: Re: [PATCH] ibmvnic: Clear pending interrupt after device reset

From: Thomas Falcon <tlfalcon@...ux.vnet.ibm.com>
Date: Sun, 15 Apr 2018 18:53:36 -0500

> Due to a firmware bug, the hypervisor can send an interrupt to a
> transmit or receive queue just prior to a partition migration, not
> allowing the device enough time to handle it and send an EOI. When
> the partition migrates, the interrupt is lost but an "EOI-pending"
> flag for the interrupt line is still set in firmware. No further
> interrupts will be sent until that flag is cleared, effectively
> freezing that queue. To workaround this, the driver will disable the
> hardware interrupt and send an H_EOI signal prior to re-enabling it.
> This will flush the pending EOI and allow the driver to continue
> operation.
> 
> Signed-off-by: Thomas Falcon <tlfalcon@...ux.vnet.ibm.com>

Hey Thomas, I see two copies of this patch posted.  Any special
reason for that?

Thanks.