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| author | Stefan Hajnoczi <stefanha@redhat.com> | 2018-03-07 12:46:19 +0000 |
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| committer | Stefan Hajnoczi <stefanha@redhat.com> | 2018-03-12 11:07:37 +0000 |
| commit | 7376eda7c2e0451e819e81bd05fabc56a9deb946 (patch) | |
| tree | c5a89490ebd3871f68331544ad39567ca4f0e832 /chardev/char-socket.c | |
| parent | e4ae62b802cec437f877f2cadc4ef059cc0eca76 (diff) | |
| download | focaccia-qemu-7376eda7c2e0451e819e81bd05fabc56a9deb946.tar.gz focaccia-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 'chardev/char-socket.c')
0 files changed, 0 insertions, 0 deletions