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block: Keep subtree drained in drop_intermediate
authorMax Reitz <mreitz@redhat.com>
Mon, 22 Jul 2019 13:33:43 +0000 (15:33 +0200)
committerKevin Wolf <kwolf@redhat.com>
Fri, 16 Aug 2019 08:25:16 +0000 (10:25 +0200)
commit637d54a5f3a1965fa6aea9e41c4f84abf7a36de9
treef4b69897939b4819390aa4da545912e3098934d5tree | snapshot
parente444fa83126d56f3feafe3c3397c149cac82ce96commit | diff
block: Keep subtree drained in drop_intermediate

bdrv_drop_intermediate() calls BdrvChildRole.update_filename().  That
may poll, thus changing the graph, which potentially breaks the
QLIST_FOREACH_SAFE() loop.

Just keep the whole subtree drained.  This is probably the right thing
to do anyway (dropping nodes while the subtree is not drained seems
wrong).

Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
block.c diff | blob | history
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