Re: [PATCH net-next] net: phy: at803x: Use devm_regulator_get_enable_optional()

From: Christophe JAILLET
Date: Tue Jun 20 2023 - 13:45:35 EST


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@xxxxxxxxxx>
---
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@xxxxxxxxxxxxxxxxxxxx/

+ 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,