Re: [PATCH 05/10] rust: pl011: pull interrupt updates out of read/write ops

[Zhao Liu <zhao1.liu@intel.com>]

On Fri, Jan 17, 2025 at 10:26:52AM +0100, Paolo Bonzini wrote:
> Date: Fri, 17 Jan 2025 10:26:52 +0100
> From: Paolo Bonzini <pbonzini@redhat.com>
> Subject: [PATCH 05/10] rust: pl011: pull interrupt updates out of
>  read/write ops
> X-Mailer: git-send-email 2.47.1
> 
> qemu_irqs are not part of the vmstate, therefore they will remain in
> PL011State.  Update them if needed after regs_read()/regs_write().
> 
> Apply #[must_use] to functions that return whether the interrupt state
> could have changed, so that it's harder to forget the call to update().
> 
> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
> ---
>  rust/hw/char/pl011/src/device.rs | 68 ++++++++++++++++++--------------
>  1 file changed, 38 insertions(+), 30 deletions(-)
> 

[snip]

>  
>      pub fn event(&mut self, event: QEMUChrEvent) {
>          if event == bindings::QEMUChrEvent::CHR_EVENT_BREAK && !self.loopback_enabled() {
> -            self.put_fifo(registers::Data::BREAK.into());
> +            let update = self.put_fifo(registers::Data::BREAK.into());

We can omit this `update` variable.

> +            if update {
> +                self.update();
> +            }
>          }
>      }

Nice refactoring!

Reviewed-by: Zhao Liu <zhao.liu@intel.com>