linux-kernel - [PATCH v3 0/2] virtio_console: fix replug of virtio console port

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Message-Id: <20190809064847.28918-1-pagupta@redhat.com>
Date:   Fri,  9 Aug 2019 12:18:45 +0530
From:   Pankaj Gupta <pagupta@...hat.com>
To:     amit@...nel.org, mst@...hat.com
Cc:     arnd@...db.de, gregkh@...uxfoundation.org,
        virtualization@...ts.linux-foundation.org, jasowang@...hat.com,
        linux-kernel@...r.kernel.org, pagupta@...hat.com,
        xiaohli@...hat.com
Subject: [PATCH v3 0/2] virtio_console: fix replug of virtio console port

This patch series fixes the issue with unplug/replug of a port in virtio
console driver which fails with an error "Error allocating inbufs\n".
Patch 1 makes use of 'virtqueue_detach_unused_buf' function to detach
the unused buffers during port hotunplug time.
Patch 2 updates the next avail index for packed ring code.
Tested the packed ring code with the qemu virtio 1.1 device code posted
here [1].

Changes from v2
 Better change log in patch2 - [Greg]
Changes from v1[2]
 Make virtio packed ring code compatible with split ring - [Michael]

[1]  https://marc.info/?l=qemu-devel&m=156471883703948&w=2
[2]  https://lkml.org/lkml/2019/3/4/517

Pankaj Gupta (2):
  virtio_console: free unused buffers with port delete
  virtio: decrement avail idx with buffer detach for packed ring

 char/virtio_console.c |   14 +++++++++++---
 virtio/virtio_ring.c  |    6 ++++++
 2 files changed, 17 insertions(+), 3 deletions(-)
-- 
2.21.0