linux-kernel - Re: [PATCH v3 2/9] fpga: dfl: omit unneeded null pointer check from {afu,fme}

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Message-ID: <bb513adfecd4806f73b03ff25a23e80bc69f075d.camel@intel.com>
Date: Fri, 25 Oct 2024 22:40:57 +0000
From: "Colberg, Peter" <peter.colberg@...el.com>
To: "yilun.xu@...ux.intel.com" <yilun.xu@...ux.intel.com>
CC: "Xu, Yilun" <yilun.xu@...el.com>, "linux-fpga@...r.kernel.org"
	<linux-fpga@...r.kernel.org>, "mdf@...nel.org" <mdf@...nel.org>, "Wu, Hao"
	<hao.wu@...el.com>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, "russ.weight@...ux.dev"
	<russ.weight@...ux.dev>, "Pagani, Marco" <marpagan@...hat.com>,
	"trix@...hat.com" <trix@...hat.com>, "matthew.gerlach@...ux.intel.com"
	<matthew.gerlach@...ux.intel.com>
Subject: Re: [PATCH v3 2/9] fpga: dfl: omit unneeded null pointer check from
 {afu,fme}_open()

On Tue, 2024-09-24 at 14:41 +0800, Xu Yilun wrote:
> On Thu, Sep 19, 2024 at 04:34:23PM -0400, Peter Colberg wrote:
> > The feature platform device is guaranteed to have an associated platform
> > data. Refactor dfl_fpga_inode_to_feature_dev_data() to directly return
> > the platform data and retrieve the device from the data.
> 
> These changelog better describes the change, but the short log does not.
> Please update.
> 
> Thanks,
> Yilun

The subject has been revised in the patch "fpga: dfl: return platform
data from dfl_fpga_inode_to_feature_dev_data()".

Thanks,
Peter

> 
> > 
> > Signed-off-by: Peter Colberg <peter.colberg@...el.com>
> > Reviewed-by: Matthew Gerlach <matthew.gerlach@...ux.intel.com>
> > ---
> >  drivers/fpga/dfl-afu-main.c | 8 ++------
> >  drivers/fpga/dfl-fme-main.c | 7 ++-----
> >  drivers/fpga/dfl.h          | 6 +++---
> >  3 files changed, 7 insertions(+), 14 deletions(-)
> > 
> > diff --git a/drivers/fpga/dfl-afu-main.c b/drivers/fpga/dfl-afu-main.c
> > index 6b97c073849e..6125e2faada8 100644
> > --- a/drivers/fpga/dfl-afu-main.c
> > +++ b/drivers/fpga/dfl-afu-main.c
> > @@ -595,14 +595,10 @@ static struct dfl_feature_driver port_feature_drvs[] = {
> >  
> >  static int afu_open(struct inode *inode, struct file *filp)
> >  {
> > -	struct platform_device *fdev = dfl_fpga_inode_to_feature_dev(inode);
> > -	struct dfl_feature_platform_data *pdata;
> > +	struct dfl_feature_platform_data *pdata = dfl_fpga_inode_to_feature_dev_data(inode);
> > +	struct platform_device *fdev = pdata->dev;
> >  	int ret;
> >  
> > -	pdata = dev_get_platdata(&fdev->dev);
> > -	if (WARN_ON(!pdata))
> > -		return -ENODEV;
> > -
> >  	mutex_lock(&pdata->lock);
> >  	ret = dfl_feature_dev_use_begin(pdata, filp->f_flags & O_EXCL);
> >  	if (!ret) {
> > diff --git a/drivers/fpga/dfl-fme-main.c b/drivers/fpga/dfl-fme-main.c
> > index 864924f68f5e..480a187289bb 100644
> > --- a/drivers/fpga/dfl-fme-main.c
> > +++ b/drivers/fpga/dfl-fme-main.c
> > @@ -598,13 +598,10 @@ static long fme_ioctl_check_extension(struct dfl_feature_platform_data *pdata,
> >  
> >  static int fme_open(struct inode *inode, struct file *filp)
> >  {
> > -	struct platform_device *fdev = dfl_fpga_inode_to_feature_dev(inode);
> > -	struct dfl_feature_platform_data *pdata = dev_get_platdata(&fdev->dev);
> > +	struct dfl_feature_platform_data *pdata = dfl_fpga_inode_to_feature_dev_data(inode);
> > +	struct platform_device *fdev = pdata->dev;
> >  	int ret;
> >  
> > -	if (WARN_ON(!pdata))
> > -		return -ENODEV;
> > -
> >  	mutex_lock(&pdata->lock);
> >  	ret = dfl_feature_dev_use_begin(pdata, filp->f_flags & O_EXCL);
> >  	if (!ret) {
> > diff --git a/drivers/fpga/dfl.h b/drivers/fpga/dfl.h
> > index 5063d73b0d82..2285215f444e 100644
> > --- a/drivers/fpga/dfl.h
> > +++ b/drivers/fpga/dfl.h
> > @@ -398,14 +398,14 @@ int dfl_fpga_dev_ops_register(struct platform_device *pdev,
> >  			      struct module *owner);
> >  void dfl_fpga_dev_ops_unregister(struct platform_device *pdev);
> >  
> > -static inline
> > -struct platform_device *dfl_fpga_inode_to_feature_dev(struct inode *inode)
> > +static inline struct dfl_feature_platform_data *
> > +dfl_fpga_inode_to_feature_dev_data(struct inode *inode)
> >  {
> >  	struct dfl_feature_platform_data *pdata;
> >  
> >  	pdata = container_of(inode->i_cdev, struct dfl_feature_platform_data,
> >  			     cdev);
> > -	return pdata->dev;
> > +	return pdata;
> >  }
> >  
> >  #define dfl_fpga_dev_for_each_feature(pdata, feature)			    \
> > -- 
> > 2.46.1
> > 
> >