linux-kernel - Re: [PATCH 04/11] PCI: epf-test: Refactor pci_epf_test

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Date: Fri, 22 Mar 2024 17:09:03 +0100
From: Niklas Cassel <cassel@...nel.org>
To: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Cc: Lorenzo Pieralisi <lpieralisi@...nel.org>,
	Krzysztof Wilczyński <kw@...ux.com>,
	Rob Herring <robh@...nel.org>, Bjorn Helgaas <bhelgaas@...gle.com>,
	Kishon Vijay Abraham I <kishon@...nel.org>,
	Thierry Reding <thierry.reding@...il.com>,
	Jonathan Hunter <jonathanh@...dia.com>,
	Jingoo Han <jingoohan1@...il.com>,
	Gustavo Pimentel <gustavo.pimentel@...opsys.com>,
	linux-pci@...r.kernel.org, linux-arm-msm@...r.kernel.org,
	linux-kernel@...r.kernel.org, mhi@...ts.linux.dev,
	linux-tegra@...r.kernel.org
Subject: Re: [PATCH 04/11] PCI: epf-test: Refactor pci_epf_test_unbind()
 function

On Thu, Mar 14, 2024 at 08:53:43PM +0530, Manivannan Sadhasivam wrote:
> Move the pci_epc_clear_bar() and pci_epf_free_space() code to respective
> helper functions. This allows reusing the helpers in future commits.
> 
> This also requires moving the pci_epf_test_unbind() definition below
> pci_epf_test_bind() to avoid forward declaration of the above helpers.
> 
> No functional change.
> 
> Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> ---
>  drivers/pci/endpoint/functions/pci-epf-test.c | 63 ++++++++++++++++++---------
>  1 file changed, 42 insertions(+), 21 deletions(-)
> 
> diff --git a/drivers/pci/endpoint/functions/pci-epf-test.c b/drivers/pci/endpoint/functions/pci-epf-test.c
> index 1dae0fce8fc4..2fac36553633 100644
> --- a/drivers/pci/endpoint/functions/pci-epf-test.c
> +++ b/drivers/pci/endpoint/functions/pci-epf-test.c
> @@ -686,27 +686,6 @@ static void pci_epf_test_cmd_handler(struct work_struct *work)
>  			   msecs_to_jiffies(1));
>  }
>  
> -static void pci_epf_test_unbind(struct pci_epf *epf)
> -{
> -	struct pci_epf_test *epf_test = epf_get_drvdata(epf);
> -	struct pci_epc *epc = epf->epc;
> -	struct pci_epf_bar *epf_bar;
> -	int bar;
> -
> -	cancel_delayed_work(&epf_test->cmd_handler);
> -	pci_epf_test_clean_dma_chan(epf_test);
> -	for (bar = 0; bar < PCI_STD_NUM_BARS; bar++) {
> -		epf_bar = &epf->bar[bar];
> -
> -		if (epf_test->reg[bar]) {
> -			pci_epc_clear_bar(epc, epf->func_no, epf->vfunc_no,
> -					  epf_bar);
> -			pci_epf_free_space(epf, epf_test->reg[bar], bar,
> -					   PRIMARY_INTERFACE);
> -		}
> -	}
> -}
> -
>  static int pci_epf_test_set_bar(struct pci_epf *epf)
>  {
>  	int bar, add;
> @@ -746,6 +725,22 @@ static int pci_epf_test_set_bar(struct pci_epf *epf)
>  	return 0;
>  }
>  
> +static void pci_epf_test_clear_bar(struct pci_epf *epf)
> +{
> +	struct pci_epf_test *epf_test = epf_get_drvdata(epf);
> +	struct pci_epc *epc = epf->epc;
> +	struct pci_epf_bar *epf_bar;
> +	int bar;
> +
> +	for (bar = 0; bar < PCI_STD_NUM_BARS; bar++) {
> +		epf_bar = &epf->bar[bar];
> +
> +		if (epf_test->reg[bar])
> +			pci_epc_clear_bar(epc, epf->func_no, epf->vfunc_no,
> +					  epf_bar);
> +	}
> +}
> +
>  static int pci_epf_test_epc_init(struct pci_epf *epf)
>  {
>  	struct pci_epf_test *epf_test = epf_get_drvdata(epf);
> @@ -885,6 +880,22 @@ static int pci_epf_test_alloc_space(struct pci_epf *epf)
>  	return 0;
>  }
>  
> +static void pci_epf_test_free_space(struct pci_epf *epf)
> +{
> +	struct pci_epf_test *epf_test = epf_get_drvdata(epf);
> +	struct pci_epf_bar *epf_bar;
> +	int bar;
> +
> +	for (bar = 0; bar < PCI_STD_NUM_BARS; bar++) {
> +		epf_bar = &epf->bar[bar];
> +
> +		if (epf_test->reg[bar]) {
> +			pci_epf_free_space(epf, epf_test->reg[bar], bar,
> +					   PRIMARY_INTERFACE);
> +		}

Nit: No need for braces here. (Just like you don't have braces in
pci_epf_test_clear_bar()).

Like you said in the other thread, this commit clashes with changes done
in my series.

However, except for the small nit, the commit looks good:
Reviewed-by: Niklas Cassel <cassel@...nel.org>


> +	}
> +}
> +
>  static void pci_epf_configure_bar(struct pci_epf *epf,
>  				  const struct pci_epc_features *epc_features)
>  {
> @@ -940,6 +951,16 @@ static int pci_epf_test_bind(struct pci_epf *epf)
>  	return 0;
>  }
>  
> +static void pci_epf_test_unbind(struct pci_epf *epf)
> +{
> +	struct pci_epf_test *epf_test = epf_get_drvdata(epf);
> +
> +	cancel_delayed_work(&epf_test->cmd_handler);
> +	pci_epf_test_clean_dma_chan(epf_test);
> +	pci_epf_test_clear_bar(epf);
> +	pci_epf_test_free_space(epf);
> +}
> +
>  static const struct pci_epf_device_id pci_epf_test_ids[] = {
>  	{
>  		.name = "pci_epf_test",
> 
> -- 
> 2.25.1
>