Re: [Qemu-devel] [PATCH] usb: Change *_exitfn return type from void to int

[Eric Blake]

On 09/30/2016 12:51 PM, Akanksha Srivastava wrote:
> The *_exitfn functions cannot fail and should not be
> returning int.
> Suggested as a Bite-sized task
> Signed-off-by: Akanksha Srivastava <address@hidden>
> ---
>  hw/usb/ccid-card-emulated.c | 4 ++--
>  hw/usb/ccid-card-passthru.c | 4 ++--
>  2 files changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/hw/usb/ccid-card-emulated.c b/hw/usb/ccid-card-emulated.c
> index 3213f9f..abb2773 100644
> --- a/hw/usb/ccid-card-emulated.c
> +++ b/hw/usb/ccid-card-emulated.c
> @@ -547,7 +547,7 @@ static int emulated_initfn(CCIDCardState *base)
>      return 0;
>  }
>  
> -static int emulated_exitfn(CCIDCardState *base)
> +static void emulated_exitfn(CCIDCardState *base)
>  {
>      EmulatedState *card = EMULATED_CCID_CARD(base);
>      VEvent *vevent = vevent_new(VEVENT_LAST, NULL, NULL);
> @@ -564,7 +564,7 @@ static int emulated_exitfn(CCIDCardState *base)
>      qemu_mutex_destroy(&card->handle_apdu_mutex);
>      qemu_mutex_destroy(&card->vreader_mutex);
>      qemu_mutex_destroy(&card->event_list_mutex);
> -    return 0;
> +    return;
>  }

Ending a function that returns void with 'return' is redundant; just
drop the return statement altogether if it is the last thing that can be
reached.

>  
>  static Property emulated_card_properties[] = {
> diff --git a/hw/usb/ccid-card-passthru.c b/hw/usb/ccid-card-passthru.c
> index 2eacea7..2bd9cb2 100644
> --- a/hw/usb/ccid-card-passthru.c
> +++ b/hw/usb/ccid-card-passthru.c
> @@ -364,9 +364,9 @@ static int passthru_initfn(CCIDCardState *base)
>      return 0;
>  }
>  
> -static int passthru_exitfn(CCIDCardState *base)
> +static void passthru_exitfn(CCIDCardState *base)
>  {
> -    return 0;
> +    return;
>  }

And again.  Since the callback does nothing, do you even need it to
exist, or can you do further cleanups that allow the callback to be
optional if it would otherwise be a no-op?

-- 
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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