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SubjectRe: [PATCH v3 06/21] fpga: dfl: adds fpga_cdev_find_port
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?

> 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"

>
> 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.

Alan

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