[PATCH v2] net: stmmac: avoid repeated devm_gpiod_get_optional in mdio
From: Liu Xiang <hidden>
Date: 2026-03-28 03:26:07
Subsystem:
networking drivers, stmmac ethernet driver, the rest · Maintainers:
Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
During system resume, stmmac_resume() calls stmmac_mdio_reset(). This results in repeated calls to devm_gpiod_get_optional() for the same GPIO. The second invocation returns an error since the GPIO descriptor has already been obtained. Signed-off-by: Liu Xiang <redacted> --- drivers/net/ethernet/stmicro/stmmac/stmmac.h | 2 ++ .../net/ethernet/stmicro/stmmac/stmmac_mdio.c | 18 +++++++++--------- 2 files changed, 11 insertions(+), 9 deletions(-)
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac.h b/drivers/net/ethernet/stmicro/stmmac/stmmac.h
index 33667a267..34ebc6f3a 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac.h
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac.h@@ -372,6 +372,8 @@ struct stmmac_priv { struct bpf_prog *xdp_prog; struct devlink *devlink; + + struct gpio_desc *reset_gpio; }; enum stmmac_state {
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
index a7c2496b3..d85cfb044 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c@@ -386,15 +386,15 @@ int stmmac_mdio_reset(struct mii_bus *bus) #ifdef CONFIG_OF if (priv->device->of_node) { - struct gpio_desc *reset_gpio; u32 delays[3] = { 0, 0, 0 }; - reset_gpio = devm_gpiod_get_optional(priv->device, - "snps,reset", - GPIOD_OUT_LOW); - if (IS_ERR(reset_gpio)) - return PTR_ERR(reset_gpio); - + if (IS_ERR_OR_NULL(priv->reset_gpio)) { + priv->reset_gpio = devm_gpiod_get_optional(priv->device, + "snps,reset", + GPIOD_OUT_LOW); + if (IS_ERR(priv->reset_gpio)) + return PTR_ERR(priv->reset_gpio); + } device_property_read_u32_array(priv->device, "snps,reset-delays-us", delays, ARRAY_SIZE(delays));
@@ -402,11 +402,11 @@ int stmmac_mdio_reset(struct mii_bus *bus) if (delays[0]) msleep(DIV_ROUND_UP(delays[0], 1000)); - gpiod_set_value_cansleep(reset_gpio, 1); + gpiod_set_value_cansleep(priv->reset_gpio, 1); if (delays[1]) msleep(DIV_ROUND_UP(delays[1], 1000)); - gpiod_set_value_cansleep(reset_gpio, 0); + gpiod_set_value_cansleep(priv->reset_gpio, 0); if (delays[2]) msleep(DIV_ROUND_UP(delays[2], 1000)); }
--
2.34.1