linux-kernel - Re: [PATCH v2 1/2] s390/vfio-ap: No need to disable IRQ after queue reset

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Date:   Sat, 12 Dec 2020 09:20:30 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Tony Krowiak <akrowiak@...ux.ibm.com>
Cc:     linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org, stable@...r.kernel.org, sashal@...nel.org,
        borntraeger@...ibm.com, cohuck@...hat.com, kwankhede@...dia.com,
        pbonzini@...hat.com, alex.williamson@...hat.com,
        pasic@...ux.vnet.ibm.com
Subject: Re: [PATCH v2 1/2] s390/vfio-ap: No need to disable IRQ after queue
 reset

On Fri, Dec 11, 2020 at 05:22:10PM -0500, Tony Krowiak wrote:
> The queues assigned to a matrix mediated device are currently reset when:
> 
> * The VFIO_DEVICE_RESET ioctl is invoked
> * The mdev fd is closed by userspace (QEMU)
> * The mdev is removed from sysfs.
> 
> Immediately after the reset of a queue, a call is made to disable
> interrupts for the queue. This is entirely unnecessary because the reset of
> a queue disables interrupts, so this will be removed.
> 
> Signed-off-by: Tony Krowiak <akrowiak@...ux.ibm.com>
> ---
>  drivers/s390/crypto/vfio_ap_drv.c     |  1 -
>  drivers/s390/crypto/vfio_ap_ops.c     | 40 +++++++++++++++++----------
>  drivers/s390/crypto/vfio_ap_private.h |  1 -
>  3 files changed, 26 insertions(+), 16 deletions(-)

<formletter>

This is not the correct way to submit patches for inclusion in the
stable kernel tree.  Please read:
    https://www.kernel.org/doc/html/latest/process/stable-kernel-rules.html
for how to do this properly.

</formletter>