diff options
| author | Eric Blake <eblake@redhat.com> | 2016-04-28 15:45:27 -0600 |
|---|---|---|
| committer | Markus Armbruster <armbru@redhat.com> | 2016-05-12 09:47:55 +0200 |
| commit | 15c2f669e3fb2bc97f7b42d1871f595c0ac24af8 (patch) | |
| tree | d5baa8f103d90e6d13d51d351b869b6cde427413 /block | |
| parent | 56a6f02b8ce1fe41a2a9077593e46eca7d98267d (diff) | |
qapi: Split visit_end_struct() into pieces
As mentioned in previous patches, we want to call visit_end_struct()
functions unconditionally, so that visitors can release resources
tied up since the matching visit_start_struct() without also having
to worry about error priority if more than one error occurs.
Even though error_propagate() can be safely used to ignore a second
error during cleanup caused by a first error, it is simpler if the
cleanup cannot set an error. So, split out the error checking
portion (basically, input visitors checking for unvisited keys) into
a new function visit_check_struct(), which can be safely skipped if
any earlier errors are encountered, and leave the cleanup portion
(which never fails, but must be called unconditionally if
visit_start_struct() succeeded) in visit_end_struct().
Generated code in qapi-visit.c has diffs resembling:
|@@ -59,10 +59,12 @@ void visit_type_ACPIOSTInfo(Visitor *v,
| goto out_obj;
| }
| visit_type_ACPIOSTInfo_members(v, obj, &err);
|- error_propagate(errp, err);
|- err = NULL;
|+ if (err) {
|+ goto out_obj;
|+ }
|+ visit_check_struct(v, &err);
| out_obj:
|- visit_end_struct(v, &err);
|+ visit_end_struct(v);
| out:
and in qapi-event.c:
@@ -47,7 +47,10 @@ void qapi_event_send_acpi_device_ost(ACP
| goto out;
| }
| visit_type_q_obj_ACPI_DEVICE_OST_arg_members(v, ¶m, &err);
|- visit_end_struct(v, err ? NULL : &err);
|+ if (!err) {
|+ visit_check_struct(v, &err);
|+ }
|+ visit_end_struct(v);
| if (err) {
| goto out;
Signed-off-by: Eric Blake <eblake@redhat.com>
Message-Id: <1461879932-9020-20-git-send-email-eblake@redhat.com>
[Conflict with a doc fixup resolved]
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Diffstat (limited to 'block')
| -rw-r--r-- | block/crypto.c | 14 |
1 files changed, 8 insertions, 6 deletions
diff --git a/block/crypto.c b/block/crypto.c index 1903e84fbd..2424a4c9c9 100644 --- a/block/crypto.c +++ b/block/crypto.c @@ -196,7 +196,6 @@ block_crypto_open_opts_init(QCryptoBlockFormat format, OptsVisitor *ov; QCryptoBlockOpenOptions *ret = NULL; Error *local_err = NULL; - Error *end_err = NULL; ret = g_new0(QCryptoBlockOpenOptions, 1); ret->format = format; @@ -219,9 +218,11 @@ block_crypto_open_opts_init(QCryptoBlockFormat format, error_setg(&local_err, "Unsupported block format %d", format); break; } + if (!local_err) { + visit_check_struct(opts_get_visitor(ov), &local_err); + } - visit_end_struct(opts_get_visitor(ov), &end_err); - error_propagate(&local_err, end_err); + visit_end_struct(opts_get_visitor(ov)); out: if (local_err) { @@ -242,7 +243,6 @@ block_crypto_create_opts_init(QCryptoBlockFormat format, OptsVisitor *ov; QCryptoBlockCreateOptions *ret = NULL; Error *local_err = NULL; - Error *end_err = NULL; ret = g_new0(QCryptoBlockCreateOptions, 1); ret->format = format; @@ -265,9 +265,11 @@ block_crypto_create_opts_init(QCryptoBlockFormat format, error_setg(&local_err, "Unsupported block format %d", format); break; } + if (!local_err) { + visit_check_struct(opts_get_visitor(ov), &local_err); + } - visit_end_struct(opts_get_visitor(ov), &end_err); - error_propagate(&local_err, end_err); + visit_end_struct(opts_get_visitor(ov)); out: if (local_err) { |