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blkdebug: Use QLIST_FOREACH_SAFE to resume IO 

Qemu-iotest 030 was broken.

When the coroutine runs and finishes, it will remove itself from the req
list, so let's use safe version of foreach to avoid use after free.

Signed-off-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Fam Zheng 2013-12-13 15:25:12 +08:00 committed by Kevin Wolf
parent 802c3d4ccc
commit c547e5640d
1 changed files with 4 additions and 4 deletions
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8
block/blkdebug.c
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@ -594,9 +594,9 @@ static int blkdebug_debug_breakpoint(BlockDriverState *bs, const char *event,
static int blkdebug_debug_resume(BlockDriverState *bs, const char *tag)
{
BDRVBlkdebugState *s = bs->opaque;
BlkdebugSuspendedReq *r;
BlkdebugSuspendedReq *r, *next;
QLIST_FOREACH(r, &s->suspended_reqs, next) {
QLIST_FOREACH_SAFE(r, &s->suspended_reqs, next, next) {
if (!strcmp(r->tag, tag)) {
qemu_coroutine_enter(r->co, NULL);
return 0;
@ -609,7 +609,7 @@ static int blkdebug_debug_remove_breakpoint(BlockDriverState *bs,
const char *tag)
{
BDRVBlkdebugState *s = bs->opaque;
BlkdebugSuspendedReq *r;
BlkdebugSuspendedReq *r, *r_next;
BlkdebugRule *rule, *next;
int i, ret = -ENOENT;
@ -622,7 +622,7 @@ static int blkdebug_debug_remove_breakpoint(BlockDriverState *bs,
}
}
}
QLIST_FOREACH(r, &s->suspended_reqs, next) {
QLIST_FOREACH_SAFE(r, &s->suspended_reqs, next, r_next) {
if (!strcmp(r->tag, tag)) {
qemu_coroutine_enter(r->co, NULL);
ret = 0;