Re: [PATCH v2 1/4] i915: make inject_virtual_interrupt() void

Zhenyu Wang
2023-11-23T00:26:04Z

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On 2023.11.22 13:48:22 +0100, Christian Brauner wrote:
> The single caller of inject_virtual_interrupt() ignores the return value
> anyway. This allows us to simplify eventfd_signal() in follow-up
> patches.
>
> Signed-off-by: Christian Brauner <brauner@kernel.org>
> ---
> drivers/gpu/drm/i915/gvt/interrupt.c | 14 +++++++-------
> 1 file changed, 7 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/gvt/interrupt.c b/drivers/gpu/drm/i915/gvt/interrupt.c
> index de3f5903d1a7..9665876b4b13 100644
> --- a/drivers/gpu/drm/i915/gvt/interrupt.c
> +++ b/drivers/gpu/drm/i915/gvt/interrupt.c
> @@ -422,7 +422,7 @@ static void init_irq_map(struct intel_gvt_irq *irq)
> #define MSI_CAP_DATA(offset) (offset + 8)
> #define MSI_CAP_EN 0x1
>
> -static int inject_virtual_interrupt(struct intel_vgpu *vgpu)
> +static void inject_virtual_interrupt(struct intel_vgpu *vgpu)
> {
> unsigned long offset = vgpu->gvt->device_info.msi_cap_offset;
> u16 control, data;
> @@ -434,10 +434,10 @@ static int inject_virtual_interrupt(struct intel_vgpu *vgpu)
>
> /* Do not generate MSI if MSIEN is disabled */
> if (!(control & MSI_CAP_EN))
> - return 0;
> + return;
>
> if (WARN(control & GENMASK(15, 1), "only support one MSI format\n"))
> - return -EINVAL;
> + return;
>
> trace_inject_msi(vgpu->id, addr, data);
>
> @@ -451,10 +451,10 @@ static int inject_virtual_interrupt(struct intel_vgpu *vgpu)
> * returned and don't inject interrupt into guest.
> */
> if (!test_bit(INTEL_VGPU_STATUS_ATTACHED, vgpu->status))
> - return -ESRCH;
> - if (vgpu->msi_trigger && eventfd_signal(vgpu->msi_trigger, 1) != 1)
> - return -EFAULT;
> - return 0;
> + return;
> + if (!vgpu->msi_trigger)
> + return;
> + eventfd_signal(vgpu->msi_trigger, 1);
> }

I think it's a little simpler to write as
if (vgpu->msi_trigger)
eventfd_signal(vgpu->msi_trigger, 1);

Looks fine with me.

Reviewed-by: Zhenyu Wang <zhenyuw@linux.intel.com>

Thanks!

>
> static void propagate_event(struct intel_gvt_irq *irq,
>
> --
> 2.42.0
>

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