linux-kernel - Re: [PATCH v1] i2c: nvidia-gpu: drop empty stub for runtime pm

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Date:   Sat, 7 Nov 2020 14:34:42 +0530
From:   Vaibhav Gupta <vaibhavgupta40@...il.com>
To:     Ajay Gupta <ajayg@...dia.com>
Cc:     Jarkko Nikula <jarkko.nikula@...ux.intel.com>,
        Bjorn Helgaas <helgaas@...nel.org>, linux-i2c@...r.kernel.org,
        linux-kernel@...r.kernel.org, Bjorn Helgaas <bhelgaas@...gle.com>
Subject: Re: [PATCH v1] i2c: nvidia-gpu: drop empty stub for runtime pm

On Sat, Nov 07, 2020 at 01:51:51PM +0530, Vaibhav Gupta wrote:
> After the commit c5eb1190074c ("PCI / PM: Allow runtime PM without callback
> functions") we no more need empty stubs for runtime-pm to work.
> 
> The driver has no device specific task(s) for .suspend() . The stub was
> placed just for runtime-pm, which can be dropped now.
> 
> Reported-by: Bjorn Helgaas <bhelgaas@...gle.com>
> Signed-off-by: Vaibhav Gupta <vaibhavgupta40@...il.com>
> ---
>  drivers/i2c/busses/i2c-nvidia-gpu.c | 10 +---------
>  1 file changed, 1 insertion(+), 9 deletions(-)
> 
> diff --git a/drivers/i2c/busses/i2c-nvidia-gpu.c b/drivers/i2c/busses/i2c-nvidia-gpu.c
> index f9a69b109e5c..6b20601ffb13 100644
> --- a/drivers/i2c/busses/i2c-nvidia-gpu.c
> +++ b/drivers/i2c/busses/i2c-nvidia-gpu.c
> @@ -353,15 +353,7 @@ static void gpu_i2c_remove(struct pci_dev *pdev)
>  	pci_free_irq_vectors(pdev);
>  }
>  
> -/*
> - * We need gpu_i2c_suspend() even if it is stub, for runtime pm to work
> - * correctly. Without it, lspci shows runtime pm status as "D0" for the card.
> - * Documentation/power/pci.rst also insists for driver to provide this.
> - */
> -static __maybe_unused int gpu_i2c_suspend(struct device *dev)
> -{
> -	return 0;
> -}
> +#define gpu_i2c_suspend NULL
>  
>  static __maybe_unused int gpu_i2c_resume(struct device *dev)
>  {
> -- 
> 2.28.0
> 
The patch is only compile-tested.

--Vaibhav