linux-kernel - Re: [PATCH v6 2/9] PCI: endpoint: Pass EPF device ID to the probe function

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Message-ID: <20230605135528.GF5536@thinkpad>
Date:   Mon, 5 Jun 2023 19:25:28 +0530
From:   Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To:     Lorenzo Pieralisi <lpieralisi@...nel.org>
Cc:     Damien Le Moal <dlemoal@...nel.org>, kw@...ux.com,
        kishon@...nel.org, bhelgaas@...gle.com, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH v6 2/9] PCI: endpoint: Pass EPF device ID to the probe
 function

On Mon, Jun 05, 2023 at 03:08:33PM +0200, Lorenzo Pieralisi wrote:
> On Fri, Jun 02, 2023 at 09:13:25PM +0900, Damien Le Moal wrote:
> > On 6/2/23 20:47, Manivannan Sadhasivam wrote:
> > > Currently, the EPF probe function doesn't get the device ID argument needed
> > > to correctly identify the device table ID of the EPF device.
> > > 
> > > When multiple entries are added to the "struct pci_epf_device_id" table,
> > > the probe function needs to identify the correct one. This is achieved by
> > > modifying the pci_epf_match_id() function to return the match ID pointer
> > > and passing it to the driver's probe function.
> > > 
> > > pci_epf_device_match() function can return bool based on the return value
> > > of pci_epf_match_id().
> > > 
> > > Reviewed-by: Kishon Vijay Abraham I <kishon@...nel.org>
> > > Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> > 
> > [...]
> > 
> > >  static int pci_epf_device_match(struct device *dev, struct device_driver *drv)
> > > @@ -510,8 +510,12 @@ static int pci_epf_device_match(struct device *dev, struct device_driver *drv)
> > >  	struct pci_epf *epf = to_pci_epf(dev);
> > >  	struct pci_epf_driver *driver = to_pci_epf_driver(drv);
> > >  
> > > -	if (driver->id_table)
> > > -		return pci_epf_match_id(driver->id_table, epf);
> > > +	if (driver->id_table) {
> > > +		if (pci_epf_match_id(driver->id_table, epf))
> > > +			return true;
> > > +		else
> > > +			return false;
> > 
> > You prefer keeping this pattern ?
> > 
> > return pci_epf_match_id(driver->id_table, epf) != NULL;
> > 
> > is no much nicer !
> 
> s/no/so
> 
> Yes it is, I can change it myself to spare Mani few cycles.
> 

Please do!

- Mani

> Lorenzo
> 
> > 
> > Anyway:
> > 
> > Reviewed-by: Damien Le Moal <dlemoal@...nel.org>
> > 
> > -- 
> > Damien Le Moal
> > Western Digital Research
> > 

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