[Qemu-devel] PATCH V2: fix NULL dereferences / races between task completition and abort

[Stefan Priebe]

This patch fixes two main issues with block/iscsi.c:
1.) iscsi_task_mgmt_abort_task_async calls iscsi_scsi_task_cancel which was 
also directly
    called in iscsi_aio_cancel

2.) a race between task completition and task abortion could happen cause the 
scsi_free_scsi_task
    were done before iscsi_schedule_bh has finished