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| author | Stefan Hajnoczi <stefanha@redhat.com> | 2020-02-14 17:17:10 +0000 |
|---|---|---|
| committer | Stefan Hajnoczi <stefanha@redhat.com> | 2020-02-22 08:26:47 +0000 |
| commit | 195ed8cb365edeb0d0a70a2ffdeb7a073f9a8117 (patch) | |
| tree | 5178e83f699e90927825a009012c9ff17047c12c /include/qemu/queue.h | |
| parent | ca8c6b22754b0f17818b1d1910d31f0aa1a49cc7 (diff) | |
| download | focaccia-qemu-195ed8cb365edeb0d0a70a2ffdeb7a073f9a8117.tar.gz focaccia-qemu-195ed8cb365edeb0d0a70a2ffdeb7a073f9a8117.zip | |
qemu/queue.h: add QLIST_SAFE_REMOVE()
QLIST_REMOVE() assumes the element is in a list. It also leaves the element's linked list pointers dangling. Introduce a safe version of QLIST_REMOVE() and convert open-coded instances of this pattern. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Sergio Lopez <slp@redhat.com> Message-id: 20200214171712.541358-4-stefanha@redhat.com Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Diffstat (limited to 'include/qemu/queue.h')
| -rw-r--r-- | include/qemu/queue.h | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/include/qemu/queue.h b/include/qemu/queue.h index fcecb70228..60e794a4e3 100644 --- a/include/qemu/queue.h +++ b/include/qemu/queue.h @@ -144,6 +144,20 @@ struct { \ *(elm)->field.le_prev = (elm)->field.le_next; \ } while (/*CONSTCOND*/0) +/* + * Like QLIST_REMOVE() but safe to call when elm is not in a list + */ +#define QLIST_SAFE_REMOVE(elm, field) do { \ + if ((elm)->field.le_prev != NULL) { \ + if ((elm)->field.le_next != NULL) \ + (elm)->field.le_next->field.le_prev = \ + (elm)->field.le_prev; \ + *(elm)->field.le_prev = (elm)->field.le_next; \ + (elm)->field.le_next = NULL; \ + (elm)->field.le_prev = NULL; \ + } \ +} while (/*CONSTCOND*/0) + #define QLIST_FOREACH(var, head, field) \ for ((var) = ((head)->lh_first); \ (var); \ |