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| author | Stefan Hajnoczi | 2018-03-07 13:46:19 +0100 |
|---|---|---|
| committer | Stefan Hajnoczi | 2018-03-12 12:07:37 +0100 |
| commit | 7376eda7c2e0451e819e81bd05fabc56a9deb946 (patch) | |
| tree | c5a89490ebd3871f68331544ad39567ca4f0e832 /include/qemu | |
| parent | Merge remote-tracking branch 'remotes/stefanha/tags/block-pull-request' into ... (diff) | |
| download | qemu-7376eda7c2e0451e819e81bd05fabc56a9deb946.tar.gz qemu-7376eda7c2e0451e819e81bd05fabc56a9deb946.tar.xz qemu-7376eda7c2e0451e819e81bd05fabc56a9deb946.zip | |
block: make BDRV_POLL_WHILE() re-entrancy safe
Nested BDRV_POLL_WHILE() calls can occur. Currently
assert(!wait_->wakeup) fails in AIO_WAIT_WHILE() when this happens.
This patch converts the bool wait_->need_kick flag to an unsigned
wait_->num_waiters counter.
Nesting works correctly because outer AIO_WAIT_WHILE() callers evaluate
the condition again after the inner caller completes (invoking the inner
caller counts as aio_poll() progress).
Reported-by: "fuweiwei (C)" <fuweiwei2@huawei.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 20180307124619.6218-1-stefanha@redhat.com
Cc: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Diffstat (limited to 'include/qemu')
0 files changed, 0 insertions, 0 deletions