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Subject: Re: [PATCH] ibmvnic: Clear pending interrupt after device reset
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 <20180415.205512.1546339550911332998.davem@davemloft.net>
From: Thomas Falcon <tlfalcon@linux.vnet.ibm.com>
Date: Sun, 15 Apr 2018 20:09:33 -0500
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On 04/15/2018 07:55 PM, David Miller wrote:
> From: Thomas Falcon <tlfalcon@linux.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@linux.vnet.ibm.com>
> Hey Thomas, I see two copies of this patch posted.  Any special
> reason for that?
>
> Thanks.
>
Sorry, I misspelled one of the email addresses and mistakenly resent it.  Please ignore this one.