error: Eliminate error_propagate() with Coccinelle, part 2
When all we do with an Error we receive into a local variable is
propagating to somewhere else, we can just as well receive it there
right away. The previous commit did that with a Coccinelle script I
consider fairly trustworthy. This commit uses the same script with
the matching of return taken out, i.e. we convert
if (!foo(..., &err)) {
...
error_propagate(errp, err);
...
}
to
if (!foo(..., errp)) {
...
...
}
This is unsound: @err could still be read between afterwards. I don't
know how to express "no read of @err without an intervening write" in
Coccinelle. Instead, I manually double-checked for uses of @err.
Suboptimal line breaks tweaked manually. qdev_realize() simplified
further to placate scripts/checkpatch.pl.
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-Id: <20200707160613.848843-36-armbru@redhat.com>
diff --git a/block/vmdk.c b/block/vmdk.c
index 4d42d2f..9a09193 100644
--- a/block/vmdk.c
+++ b/block/vmdk.c
@@ -2250,7 +2250,6 @@
{
int ret;
BlockBackend *blk = NULL;
- Error *local_err = NULL;
ret = bdrv_create_file(filename, opts, errp);
if (ret < 0) {
@@ -2259,9 +2258,8 @@
blk = blk_new_open(filename, NULL, NULL,
BDRV_O_RDWR | BDRV_O_RESIZE | BDRV_O_PROTOCOL,
- &local_err);
+ errp);
if (blk == NULL) {
- error_propagate(errp, local_err);
ret = -EIO;
goto exit;
}
