commit 4773a5f35b0d83674f92816a226a594b03bbcf60
author Li Qiang <liq3ea@163.com> Sat Aug 15 07:19:40 2020 -0700
committer Paolo Bonzini <pbonzini@redhat.com> Wed Sep 30 19:09:20 2020 +0200
tree a35d82d80af66bbf14c52a7433f7e7e8e6dfeae2
parent 5ecfbae201d68a2f13df233260c77b0a25d7cd35

hw: megasas: consider 'iov_count=0' is an error in megasas_map_sgl

Currently in 'megasas_map_sgl' when 'iov_count=0' will just return
success however the 'cmd' doens't contain any iov. This will cause
the assert in 'scsi_dma_complete' failed. This is because in
'dma_blk_cb' the 'dbs->sg_cur_index == dbs->sg->nsg' will be true
and just call 'dma_complete'. However now there is no aiocb returned.

This fixes the LP#1878263:

-->https://bugs.launchpad.net/qemu/+bug/1878263

Reported-by: Alexander Bulekov <alxndr@bu.edu>
Signed-off-by: Li Qiang <liq3ea@163.com>
Message-Id: <20200815141940.44025-3-liq3ea@163.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>