Re: [Qemu-devel] [PATCH] block/iscsi: cancel libiscsi task when ABORT TASK TMF completes

[Stefan Hajnoczi]

On Thu, Feb 15, 2018 at 03:24:54PM +0100, Peter Lieven wrote:
> Am 15.02.2018 um 12:15 schrieb Stefan Hajnoczi:
> > The libiscsi iscsi_task_mgmt_async() API documentation says:
> > 
> >    abort_task will also cancel the scsi task. The callback for the scsi
> >    task will be invoked with SCSI_STATUS_CANCELLED
> > 
> > The libiscsi implementation does not fulfil this promise.  The task's
> > callback is not invoked and its struct iscsi_pdu remains in the internal
> > list (effectively leaked).
> 
> If that contract is fixed in libiscsi, will the Qemu iSCSI driver still work?

In

+    /* If the command callback hasn't been called yet, drop the task */
+    if (!acb->bh) {

and

+    if (status == SCSI_STATUS_CANCELLED) {
+        if (!acb->bh) {

we're mindful of the fact that the callback may have been invoked by
libiscsi already.  There is no risk of double-completion.

Stefan

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