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Message-ID: <2024090521-finch-skinny-69bc@gregkh>
Date: Thu, 5 Sep 2024 07:29:10 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: Zijun Hu <zijun_hu@...oud.com>
Cc: Davidlohr Bueso <dave@...olabs.net>,
Jonathan Cameron <jonathan.cameron@...wei.com>,
Dave Jiang <dave.jiang@...el.com>,
Alison Schofield <alison.schofield@...el.com>,
Vishal Verma <vishal.l.verma@...el.com>,
Ira Weiny <ira.weiny@...el.com>,
Dan Williams <dan.j.williams@...el.com>,
Timur Tabi <timur@...nel.org>,
"David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
linux-cxl@...r.kernel.org, linux-kernel@...r.kernel.org,
netdev@...r.kernel.org, Zijun Hu <quic_zijuhu@...cinc.com>
Subject: Re: [PATCH v4 2/2] net: qcom/emac: Find sgmii_ops by
device_for_each_child()
On Thu, Sep 05, 2024 at 08:36:10AM +0800, Zijun Hu wrote:
> From: Zijun Hu <quic_zijuhu@...cinc.com>
>
> To prepare for constifying the following old driver core API:
>
> struct device *device_find_child(struct device *dev, void *data,
> int (*match)(struct device *dev, void *data));
> to new:
> struct device *device_find_child(struct device *dev, const void *data,
> int (*match)(struct device *dev, const void *data));
>
> The new API does not allow its match function (*match)() to modify
> caller's match data @*data, but emac_sgmii_acpi_match() as the old
> API's match function indeed modifies relevant match data, so it is not
> suitable for the new API any more, solved by using device_for_each_child()
> to implement relevant finding sgmii_ops function.
>
> By the way, this commit does not change any existing logic.
>
> Signed-off-by: Zijun Hu <quic_zijuhu@...cinc.com>
> ---
> drivers/net/ethernet/qualcomm/emac/emac-sgmii.c | 22 +++++++++++++++++-----
> 1 file changed, 17 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/net/ethernet/qualcomm/emac/emac-sgmii.c b/drivers/net/ethernet/qualcomm/emac/emac-sgmii.c
> index e4bc18009d08..29392c63d115 100644
> --- a/drivers/net/ethernet/qualcomm/emac/emac-sgmii.c
> +++ b/drivers/net/ethernet/qualcomm/emac/emac-sgmii.c
> @@ -293,6 +293,11 @@ static struct sgmii_ops qdf2400_ops = {
> };
> #endif
>
> +struct emac_match_data {
> + struct sgmii_ops **sgmii_ops;
> + struct device *target_device;
> +};
> +
> static int emac_sgmii_acpi_match(struct device *dev, void *data)
> {
> #ifdef CONFIG_ACPI
> @@ -303,7 +308,7 @@ static int emac_sgmii_acpi_match(struct device *dev, void *data)
> {}
> };
> const struct acpi_device_id *id = acpi_match_device(match_table, dev);
> - struct sgmii_ops **ops = data;
> + struct emac_match_data *match_data = data;
>
> if (id) {
> acpi_handle handle = ACPI_HANDLE(dev);
> @@ -324,10 +329,12 @@ static int emac_sgmii_acpi_match(struct device *dev, void *data)
>
> switch (hrv) {
> case 1:
> - *ops = &qdf2432_ops;
> + *match_data->sgmii_ops = &qdf2432_ops;
> + match_data->target_device = get_device(dev);
> return 1;
> case 2:
> - *ops = &qdf2400_ops;
> + *match_data->sgmii_ops = &qdf2400_ops;
> + match_data->target_device = get_device(dev);
Where is put_device() now called?
> return 1;
> }
> }
> @@ -356,10 +363,15 @@ int emac_sgmii_config(struct platform_device *pdev, struct emac_adapter *adpt)
> int ret;
>
> if (has_acpi_companion(&pdev->dev)) {
> + struct emac_match_data match_data = {
> + .sgmii_ops = &phy->sgmii_ops,
> + .target_device = NULL,
> + };
> struct device *dev;
>
> - dev = device_find_child(&pdev->dev, &phy->sgmii_ops,
> - emac_sgmii_acpi_match);
> + device_for_each_child(&pdev->dev, &match_data, emac_sgmii_acpi_match);
> + /* Need to put_device(@dev) after use */
> + dev = match_data.target_device;
Why this new comment? That's always required and happens down below in
the function, right? Otherwise, what changed?
thanks,
greg k-h
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