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chardev: Fix yank with the chardev-change case

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When changing from chardev-socket (which supports yank) to
chardev-socket again, it fails, because the new chardev attempts
to register a new yank instance. This in turn fails, as there
still is the yank instance from the current chardev. Also,
the old chardev shouldn't unregister the yank instance when it
is freed.

To fix this, now the new chardev only registers a yank instance if
the current chardev doesn't support yank and thus hasn't registered
one already. Also, when the old chardev is freed, it now only
unregisters the yank instance if the new chardev doesn't need it.

If the initialization of the new chardev fails, it still has
chr->handover_yank_instance set and won't unregister the yank
instance when it is freed.

s->registered_yank is always true here, as chardev-change only works
on user-visible chardevs and those are guraranteed to register a
yank instance as they are initialized via
chardev_new()
 qemu_char_open()
  cc->open() (qmp_chardev_open_socket()).

Signed-off-by: Lukas Straub <lukasstraub2@web.de>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Tested-by: Li Zhang <li.zhang@cloud.ionos.com>
Message-Id: <9637888d7591d2971975188478bb707299a1dc04.1617127849.git.lukasstraub2@web.de>
This commit is contained in:
Lukas Straub 2021-03-30 20:13:31 +02:00 • committed by Marc-André Lureau
parent f36b0efd7f
commit feb774ca3f
3 changed files with 48 additions and 10 deletions
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3
include/chardev/char.h
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@ -65,6 +65,8 @@ struct Chardev {
char *filename;
int logfd;
int be_open;
/* used to coordinate the chardev-change special-case: */
bool handover_yank_instance;
GSource *gsource;
GMainContext *gcontext;
DECLARE_BITMAP(features, QEMU_CHAR_FEATURE_LAST);
@ -251,6 +253,7 @@ struct ChardevClass {
ObjectClass parent_class;
bool internal; /* TODO: eventually use TYPE_USER_CREATABLE */
bool supports_yank;
void (*parse)(QemuOpts *opts, ChardevBackend *backend, Error **errp);
void (*open)(Chardev *chr, ChardevBackend *backend,