linux-kernel - Re: [PATCH v3 02/12] fpga: dfl: fme: add DFL_FPGA_FME_PORT

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Message-ID: <20190724134746.GD8463@hao-dev>
Date:   Wed, 24 Jul 2019 21:47:46 +0800
From:   Wu Hao <hao.wu@...el.com>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     mdf@...nel.org, linux-fpga@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-api@...r.kernel.org,
        linux-doc@...r.kernel.org, atull@...nel.org,
        Zhang Yi Z <yi.z.zhang@...el.com>,
        Xu Yilun <yilun.xu@...el.com>
Subject: Re: [PATCH v3 02/12] fpga: dfl: fme: add
 DFL_FPGA_FME_PORT_RELEASE/ASSIGN ioctl support.

On Wed, Jul 24, 2019 at 11:33:57AM +0200, Greg KH wrote:
> On Tue, Jul 23, 2019 at 12:51:25PM +0800, Wu Hao wrote:
> > +/**
> > + * dfl_fpga_cdev_config_port - configure a port feature dev
> > + * @cdev: parent container device.
> > + * @port_id: id of the port feature device.
> > + * @release: release port or assign port back.
> > + *
> > + * This function allows user to release port platform device or assign it back.
> > + * e.g. to safely turn one port from PF into VF for PCI device SRIOV support,
> > + * release port platform device is one necessary step.
> > + */
> > +int dfl_fpga_cdev_config_port(struct dfl_fpga_cdev *cdev, int port_id,
> > +			      bool release)
> > +{
> > +	return release ? detach_port_dev(cdev, port_id) :
> > +			 attach_port_dev(cdev, port_id);
> > +}
> > +EXPORT_SYMBOL_GPL(dfl_fpga_cdev_config_port);
> 
> That's a horrible api.  Every time you see this call in code, you have
> to go and look up what "bool" means here.  There's no reason for it.
> 
> Just have 2 different functions, one that attaches a port, and one that
> detaches it.  That way when you read the code that calls this function,
> you know what it does instantly without having to go look up some api
> function somewhere else.
> 
> Write code for people to read first.  And you are saving nothing here by
> trying to do two different things in the same exact function.

I see, you're right, it saves everybody's time on reading, very important.
I will fix this and keep it in mind. Thank you.

Hao

> 
> thanks,
> 
> greg k-h