From: Zhao Liu <zhao1....@intel.com>
As the comment in qapi/error, passing @errp to error_prepend() requires
ERRP_GUARD():
* = Why, when and how to use ERRP_GUARD() =
*
* Without ERRP_GUARD(), use of the @errp parameter is restricted:
...
* - It should not be passed to error_prepend(), error_vprepend() or
* error_append_hint(), because that doesn't work with &error_fatal.
* ERRP_GUARD() lifts these restrictions.
*
* To use ERRP_GUARD(), add it right at the beginning of the function.
* @errp can then be used without worrying about the argument being
* NULL or &error_fatal.
ERRP_GUARD() could avoid the case when @errp is &error_fatal, the user
can't see this additional information, because exit() happens in
error_setg earlier than information is added [1].
The bdrv_qed_co_invalidate_cache() passes @errp to error_prepend()
without ERRP_GUARD().
Though it is a BlockDriver.bdrv_co_invalidate_cache() method, and
currently its @errp parameter only points to callers' local_err, to
follow the requirement of @errp, add missing ERRP_GUARD() at the
beginning of this function.
[1]: Issue description in the commit message of commit ae7c80a7bd73
("error: New macro ERRP_GUARD()").
Cc: Stefan Hajnoczi <stefa...@redhat.com>
Cc: Kevin Wolf <kw...@redhat.com>
Cc: Hanna Reitz <hre...@redhat.com>
Cc: qemu-block@nongnu.org
Signed-off-by: Zhao Liu <zhao1....@intel.com>
Reviewed-by: Stefan Hajnoczi <stefa...@redhat.com>
---
block/qed.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/block/qed.c b/block/qed.c
index bc2f0a61c0a9..fa5bc1108552 100644
--- a/block/qed.c
+++ b/block/qed.c
@@ -1579,6 +1579,7 @@ bdrv_qed_co_change_backing_file(BlockDriverState *bs,
const char *backing_file,
static void coroutine_fn GRAPH_RDLOCK
bdrv_qed_co_invalidate_cache(BlockDriverState *bs, Error **errp)
{
+ ERRP_GUARD();
BDRVQEDState *s = bs->opaque;
int ret;
--
2.34.1
