[Qemu-devel] [PATCH 0/2] Fix immediate error handling on synthetic aios

[Avi Kivity <avi@redhat.com>]

The block layer can signal aio errors in two ways: by calling the completion
function with a negative status code, or by returning a NULL aiocb.  Two of
the synthetic aio implementations (the DMA API and the vectored aio bouncing)
fail to handle the second case correctly, resulting in crashes when
cancellation of a timed out request is attempted.

I think the long term fix is to have the block layer signal errors in just
one way -- by invoking the completion handler with a negative return code --
but in the meanwhile, here are patches that add the required error checking.

Avi Kivity (2):
  Fix vectored aio bounce handling immediate errors
  Fix DMA API when handling an immediate error from block layer

 block.c       |    5 +++++
 dma-helpers.c |   27 +++++++++++++++++++++------
 2 files changed, 26 insertions(+), 6 deletions(-)