For a fifo read pattern, we only have one running aio (possible other cases that has less number than num_children in the future), so we need to check if .acb is NULL against bdrv_aio_cancel() to avoid segfault. Cc: Eric Blake <eblake@redhat.com> Cc: Benoit Canet <benoit@irqsave.net> Cc: Kevin Wolf <kwolf@redhat.com> Cc: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Liu Yuan <namei.unix@gmail.com> Signed-off-by: Fam Zheng <famz@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
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Read the documentation in qemu-doc.html or on http://wiki.qemu-project.org - QEMU team
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