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qemu/queue.h: add QLIST_SAFE_REMOVE()

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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>
This commit is contained in:
Stefan Hajnoczi 2020-02-14 17:17:10 +00:00
parent ca8c6b2275
commit 195ed8cb36
3 changed files with 16 additions and 7 deletions
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5
block.c
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@ -2636,10 +2636,7 @@ BdrvChild *bdrv_attach_child(BlockDriverState *parent_bs,
static void bdrv_detach_child(BdrvChild *child)
{
if (child->next.le_prev) {
QLIST_REMOVE(child, next);
child->next.le_prev = NULL;
}
QLIST_SAFE_REMOVE(child, next);
bdrv_replace_child(child, NULL);

4
chardev/spice.c
View file

@ -216,9 +216,7 @@ static void char_spice_finalize(Object *obj)
vmc_unregister_interface(s);
if (s->next.le_prev) {
QLIST_REMOVE(s, next);
}
QLIST_SAFE_REMOVE(s, next);
g_free((char *)s->sin.subtype);
g_free((char *)s->sin.portname);

14
include/qemu/queue.h
View file

@ -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); \