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Date: Tue, 20 Jun 2023 19:45:24 +0200
From: Christophe JAILLET <christophe.jaillet@...adoo.fr>
To: Andrew Lunn <andrew@...n.ch>, Heiner Kallweit <hkallweit1@...il.com>,
Russell King <linux@...linux.org.uk>, "David S. Miller"
<davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
Liam Girdwood <lgirdwood@...il.com>, Mark Brown <broonie@...nel.org>
Cc: linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
netdev@...r.kernel.org
Subject: Re: [PATCH net-next] net: phy: at803x: Use
devm_regulator_get_enable_optional()
Le 17/06/2023 à 16:24, Christophe JAILLET a écrit :
> Use devm_regulator_get_enable_optional() instead of hand writing it. It
> saves some line of code.
>
> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
> ---
> Compile tested-only.
>
> If my reading is correct, regulator_disable() is still called in the same
> order, should an error occur or the driver be removed.
> ---
> drivers/net/phy/at803x.c | 44 +++++++---------------------------------
> 1 file changed, 7 insertions(+), 37 deletions(-)
>
> diff --git a/drivers/net/phy/at803x.c b/drivers/net/phy/at803x.c
> index 656136628ffd..c1f307d90518 100644
> --- a/drivers/net/phy/at803x.c
> +++ b/drivers/net/phy/at803x.c
> @@ -304,7 +304,6 @@ struct at803x_priv {
> bool is_1000basex;
> struct regulator_dev *vddio_rdev;
> struct regulator_dev *vddh_rdev;
> - struct regulator *vddio;
> u64 stats[ARRAY_SIZE(at803x_hw_stats)];
> };
>
> @@ -824,11 +823,11 @@ static int at803x_parse_dt(struct phy_device *phydev)
> if (ret < 0)
> return ret;
>
> - priv->vddio = devm_regulator_get_optional(&phydev->mdio.dev,
> - "vddio");
> - if (IS_ERR(priv->vddio)) {
Hi,
my patch is not broken by itself, but the existing code looks spurious.
If the optional regulator is not found, then -ENODEV is returned,
at803x_parse_dt() will return this error and the probe will fail.
It looks that the test should be more subtle.
I can send a follow up patch, unless there is a better way to fix the
pre-existing issue.
See [1] for a more detailed explanation.
CJ
[1]: https://lore.kernel.org/all/ZJFqCQ8bbBoX3l1g@hovoldconsulting.com/
> + ret = devm_regulator_get_enable_optional(&phydev->mdio.dev,
> + "vddio");
> + if (ret) {
> phydev_err(phydev, "failed to get VDDIO regulator\n");
> - return PTR_ERR(priv->vddio);
> + return ret;
> }
>
> /* Only AR8031/8033 support 1000Base-X for SFP modules */
> @@ -856,12 +855,6 @@ static int at803x_probe(struct phy_device *phydev)
> if (ret)
> return ret;
>
> - if (priv->vddio) {
> - ret = regulator_enable(priv->vddio);
> - if (ret < 0)
> - return ret;
> - }
> -
> if (phydev->drv->phy_id == ATH8031_PHY_ID) {
> int ccr = phy_read(phydev, AT803X_REG_CHIP_CONFIG);
> int mode_cfg;
> @@ -869,10 +862,8 @@ static int at803x_probe(struct phy_device *phydev)
> .wolopts = 0,
> };
>
> - if (ccr < 0) {
> - ret = ccr;
> - goto err;
> - }
> + if (ccr < 0)
> + return ccr;
> mode_cfg = ccr & AT803X_MODE_CFG_MASK;
>
> switch (mode_cfg) {
> @@ -890,25 +881,11 @@ static int at803x_probe(struct phy_device *phydev)
> ret = at803x_set_wol(phydev, &wol);
> if (ret < 0) {
> phydev_err(phydev, "failed to disable WOL on probe: %d\n", ret);
> - goto err;
> + return ret;
> }
> }
>
> return 0;
> -
> -err:
> - if (priv->vddio)
> - regulator_disable(priv->vddio);
> -
> - return ret;
> -}
> -
> -static void at803x_remove(struct phy_device *phydev)
> -{
> - struct at803x_priv *priv = phydev->priv;
> -
> - if (priv->vddio)
> - regulator_disable(priv->vddio);
> }
>
> static int at803x_get_features(struct phy_device *phydev)
> @@ -2021,7 +1998,6 @@ static struct phy_driver at803x_driver[] = {
> .name = "Qualcomm Atheros AR8035",
> .flags = PHY_POLL_CABLE_TEST,
> .probe = at803x_probe,
> - .remove = at803x_remove,
> .config_aneg = at803x_config_aneg,
> .config_init = at803x_config_init,
> .soft_reset = genphy_soft_reset,
> @@ -2043,7 +2019,6 @@ static struct phy_driver at803x_driver[] = {
> .name = "Qualcomm Atheros AR8030",
> .phy_id_mask = AT8030_PHY_ID_MASK,
> .probe = at803x_probe,
> - .remove = at803x_remove,
> .config_init = at803x_config_init,
> .link_change_notify = at803x_link_change_notify,
> .set_wol = at803x_set_wol,
> @@ -2059,7 +2034,6 @@ static struct phy_driver at803x_driver[] = {
> .name = "Qualcomm Atheros AR8031/AR8033",
> .flags = PHY_POLL_CABLE_TEST,
> .probe = at803x_probe,
> - .remove = at803x_remove,
> .config_init = at803x_config_init,
> .config_aneg = at803x_config_aneg,
> .soft_reset = genphy_soft_reset,
> @@ -2082,7 +2056,6 @@ static struct phy_driver at803x_driver[] = {
> PHY_ID_MATCH_EXACT(ATH8032_PHY_ID),
> .name = "Qualcomm Atheros AR8032",
> .probe = at803x_probe,
> - .remove = at803x_remove,
> .flags = PHY_POLL_CABLE_TEST,
> .config_init = at803x_config_init,
> .link_change_notify = at803x_link_change_notify,
> @@ -2100,7 +2073,6 @@ static struct phy_driver at803x_driver[] = {
> PHY_ID_MATCH_EXACT(ATH9331_PHY_ID),
> .name = "Qualcomm Atheros AR9331 built-in PHY",
> .probe = at803x_probe,
> - .remove = at803x_remove,
> .suspend = at803x_suspend,
> .resume = at803x_resume,
> .flags = PHY_POLL_CABLE_TEST,
> @@ -2117,7 +2089,6 @@ static struct phy_driver at803x_driver[] = {
> PHY_ID_MATCH_EXACT(QCA9561_PHY_ID),
> .name = "Qualcomm Atheros QCA9561 built-in PHY",
> .probe = at803x_probe,
> - .remove = at803x_remove,
> .suspend = at803x_suspend,
> .resume = at803x_resume,
> .flags = PHY_POLL_CABLE_TEST,
> @@ -2183,7 +2154,6 @@ static struct phy_driver at803x_driver[] = {
> .name = "Qualcomm QCA8081",
> .flags = PHY_POLL_CABLE_TEST,
> .probe = at803x_probe,
> - .remove = at803x_remove,
> .config_intr = at803x_config_intr,
> .handle_interrupt = at803x_handle_interrupt,
> .get_tunable = at803x_get_tunable,
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