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SubjectRe: [PATCH v3 06/21] fpga: dfl: adds fpga_cdev_find_port
On Mon, Feb 05, 2018 at 04:08:19PM -0600, Alan Tull wrote:
> On Mon, Nov 27, 2017 at 12:42 AM, Wu Hao <hao.wu@intel.com> wrote:
>
> Hi Hao,
>
> A couple comments below.
>
> > For feature devices, e.g FPGA Management Engine (FME),
>
> The first use I see of this function in this patchset is the FME PR,
> not the FME, or am I misunderstanding?

Hi Alan

Thanks for the review.

Yes, the first use is in the FME PR, the description should be more
clear here. I will improve it.

>
> > it may
> > require fpga_cdev_find_port function to find dedicate port for
> > further actions, so export this function from feature device
> > driver module.
>
> I understand the need for this function, but I'm having a hard time
> following this explanation here. Suggestion: "For feature devices,
> we need a method to find the port dedicated to the device. Add a
> function fpga_cdev_find_port to do that"

Will fix it, thanks for the suggestion.

>
> >
> > Signed-off-by: Tim Whisonant <tim.whisonant@intel.com>
> > Signed-off-by: Enno Luebbers <enno.luebbers@intel.com>
> > Signed-off-by: Shiva Rao <shiva.rao@intel.com>
> > Signed-off-by: Christopher Rauer <christopher.rauer@intel.com>
> > Signed-off-by: Xiao Guangrong <guangrong.xiao@linux.intel.com>
> > Signed-off-by: Wu Hao <hao.wu@intel.com>
> > ----
> > v3: s/fpga_for_each_port/fpga_cdev_find_port/
> > move fpga_cdev_find_port to fpga-dfl module.
> > ---
> > drivers/fpga/fpga-dfl.c | 27 +++++++++++++++++++++++++++
> > drivers/fpga/fpga-dfl.h | 16 ++++++++++++++++
> > 2 files changed, 43 insertions(+)
> >
> > diff --git a/drivers/fpga/fpga-dfl.c b/drivers/fpga/fpga-dfl.c
> > index 9294c0a..ce03b17 100644
> > --- a/drivers/fpga/fpga-dfl.c
> > +++ b/drivers/fpga/fpga-dfl.c
> > @@ -873,6 +873,33 @@ void fpga_remove_feature_devs(struct fpga_cdev *cdev)
> > }
> > EXPORT_SYMBOL_GPL(fpga_remove_feature_devs);
> >
> > +/**
> > + * __fpga_cdev_find_port - find a port under given container device
> > + * @cdev: container device
> > + * @data: data passed to match function
> > + * @match: match function used to find specific port from the port device list
> > + *
> > + * Find a port device under container device. This function needs to be
> > + * invoked with lock held.
> > + */
> > +struct platform_device *
> > +__fpga_cdev_find_port(struct fpga_cdev *cdev, void *data,
> > + int (*match)(struct platform_device *, void *))
> > +{
> > + struct feature_platform_data *pdata;
> > + struct platform_device *port_dev;
> > +
> > + list_for_each_entry(pdata, &cdev->port_dev_list, node) {
> > + port_dev = pdata->dev;
> > +
> > + if (match(port_dev, data) && get_device(&port_dev->dev))
> > + return port_dev;
>
> The caller will need to put the port_dev->dev. Please document that
> in the function header. I mentioned that in v2.

Sorry, I missed it, will add description on this function header.

Thanks again for the review and comments.

Hao

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