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Re: [Qemu-devel] [PATCH 2/2] hw: ccid-card-emulated: cleanup resource wh


From: Philippe Mathieu-Daudé
Subject: Re: [Qemu-devel] [PATCH 2/2] hw: ccid-card-emulated: cleanup resource when realize in error path
Date: Fri, 19 Oct 2018 13:56:08 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.0

On 19/10/2018 12:50, Li Qiang wrote:
> Signed-off-by: Li Qiang <address@hidden>
> ---
>  hw/usb/ccid-card-emulated.c | 20 ++++++++++++++------
>  1 file changed, 14 insertions(+), 6 deletions(-)
> 
> diff --git a/hw/usb/ccid-card-emulated.c b/hw/usb/ccid-card-emulated.c
> index b356edb..25976ed 100644
> --- a/hw/usb/ccid-card-emulated.c
> +++ b/hw/usb/ccid-card-emulated.c
> @@ -499,7 +499,7 @@ static void emulated_realize(CCIDCardState *base, Error 
> **errp)
>      card->reader = NULL;
>      card->quit_apdu_thread = 0;
>      if (init_event_notifier(card, errp) < 0) {
> -        return;
> +        goto out1;
>      }
>  
>      card->backend = 0;
> @@ -513,7 +513,7 @@ static void emulated_realize(CCIDCardState *base, Error 
> **errp)
>          for (ptable = backend_enum_table; ptable->name != NULL; ++ptable) {
>              error_append_hint(errp, "%s\n", ptable->name);
>          }
> -        return;
> +        goto out2;
>      }
>  
>      /* TODO: a passthru backened that works on local machine. third card 
> type?*/
> @@ -523,31 +523,39 @@ static void emulated_realize(CCIDCardState *base, Error 
> **errp)
>          } else {
>              error_setg(errp, "%s: you must provide all three certs for"
>                         " certificates backend", TYPE_EMULATED_CCID);
> -            return;
> +            goto out2;
>          }
>      } else {
>          if (card->backend != BACKEND_NSS_EMULATED) {
>              error_setg(errp, "%s: bad backend specified. The options are:%s"
>                         " (default), %s.", TYPE_EMULATED_CCID,
>                         BACKEND_NSS_EMULATED_NAME, BACKEND_CERTIFICATES_NAME);
> -            return;
> +            goto out2;
>          }
>          if (card->cert1 != NULL || card->cert2 != NULL || card->cert3 != 
> NULL) {
>              error_setg(errp, "%s: unexpected cert parameters to nss emulated 
> "
>                         "backend", TYPE_EMULATED_CCID);
> -            return;
> +            goto out2;
>          }
>          /* default to mirroring the local hardware readers */
>          ret = wrap_vcard_emul_init(NULL);
>      }
>      if (ret != VCARD_EMUL_OK) {
>          error_setg(errp, "%s: failed to initialize vcard", 
> TYPE_EMULATED_CCID);
> -        return;
> +        goto out2;
>      }
>      qemu_thread_create(&card->event_thread_id, "ccid/event", event_thread,
>                         card, QEMU_THREAD_JOINABLE);
>      qemu_thread_create(&card->apdu_thread_id, "ccid/apdu", 
> handle_apdu_thread,
>                         card, QEMU_THREAD_JOINABLE);
> +
> +out2:

You might call this 'cleanup' ...

> +    clean_event_notifier(card);
> +out1:

... and this one 'out'.

> +    qemu_cond_destroy(&card->handle_apdu_cond);
> +    qemu_mutex_destroy(&card->handle_apdu_mutex);
> +    qemu_mutex_destroy(&card->vreader_mutex);
> +    qemu_mutex_destroy(&card->event_list_mutex);
>  }
>  
>  static void emulated_unrealize(CCIDCardState *base, Error **errp)
> 



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