[Qemu-devel] [PATCH 0/3] block: fix blk_aio_*() segfault when blk->root == NULL

[Stefan Hajnoczi <stefanha@redhat.com>]

Using bdrv_inc_in_flight(blk_bs(blk)) doesn't work since BlockBackend->root may
be NULL.

This patch series solves the issue by adding an BlockBackend->in_flight counter
so requests can be tracked even when there is no BlockDriverState.

This should fix the IDE and virtio-blk segfaults that have been encountered
when there is no BlockDriverState.

The patch is based on work by Kevin Wolf.

Kevin Wolf (1):
  block: test blk_aio_flush() with blk->root == NULL

Stefan Hajnoczi (2):
  block: add BlockBackend->in_flight counter
  Revert "IDE: Do not flush empty CDROM drives"

 tests/Makefile.include     |  2 ++
 block.c                    |  2 +-
 block/block-backend.c      | 59 +++++++++++++++++++++++++++++----
 hw/ide/core.c              | 10 +-----
 tests/test-block-backend.c | 82 ++++++++++++++++++++++++++++++++++++++++++++++
 5 files changed, 138 insertions(+), 17 deletions(-)
 create mode 100644 tests/test-block-backend.c

-- 
2.14.3