[PATCH net v4 2/4] net: phy: dp83640: embed pin configuration in clock

[xuanqiang.luo@linux.dev]

From: Xuanqiang Luo <luoxuanqiang@kylinos.cn>

The DP83640 has a fixed number of PTP pins, and its pin configuration
has the same lifetime as the per-bus clock. Allocating the configuration
separately adds an allocation failure path and requires a separate free.

Embed the pin configuration in struct dp83640_clock and point the PTP
clock information at the embedded array. This changes only the storage;
the pin functions remain configurable at runtime. It also allows all
per-bus clock storage to be managed as one allocation.

Signed-off-by: Xuanqiang Luo <luoxuanqiang@kylinos.cn>
---
 drivers/net/phy/dp83640.c | 15 ++++-----------
 1 file changed, 4 insertions(+), 11 deletions(-)

diff --git a/drivers/net/phy/dp83640.c b/drivers/net/phy/dp83640.c
index 98472abdd3920..ba39d30b74705 100644
--- a/drivers/net/phy/dp83640.c
+++ b/drivers/net/phy/dp83640.c
@@ -146,6 +146,8 @@ struct dp83640_clock {
 	struct list_head phylist;
 	/* reference to our PTP hardware clock */
 	struct ptp_clock *ptp_clock;
+	/* protected by the PTP core pin configuration lock */
+	struct ptp_pin_desc pin_config[DP83640_N_PINS];
 };
 
 /* globals */
@@ -960,6 +962,7 @@ static void dp83640_clock_init(struct dp83640_clock *clock, struct mii_bus *bus)
 	mutex_init(&clock->extreg_lock);
 	mutex_init(&clock->clock_lock);
 	INIT_LIST_HEAD(&clock->phylist);
+	clock->caps.pin_config = clock->pin_config;
 	clock->caps.owner = THIS_MODULE;
 	sprintf(clock->caps.name, "dp83640 timer");
 	clock->caps.max_adj	= 1953124;
@@ -977,9 +980,7 @@ static void dp83640_clock_init(struct dp83640_clock *clock, struct mii_bus *bus)
 	clock->caps.settime64	= ptp_dp83640_settime;
 	clock->caps.enable	= ptp_dp83640_enable;
 	clock->caps.verify	= ptp_dp83640_verify;
-	/*
-	 * Convert the module param defaults into a dynamic pin configuration.
-	 */
+	/* Initialize the runtime pin configuration from gpio_tab. */
 	dp83640_gpio_defaults(clock->caps.pin_config);
 	/*
 	 * Get a reference to this bus instance.
@@ -1031,13 +1032,6 @@ static struct dp83640_clock *dp83640_clock_get_bus(struct mii_bus *bus)
 	if (!clock)
 		goto out;
 
-	clock->caps.pin_config = kzalloc_objs(struct ptp_pin_desc,
-					      DP83640_N_PINS);
-	if (!clock->caps.pin_config) {
-		kfree(clock);
-		clock = NULL;
-		goto out;
-	}
 	dp83640_clock_init(clock, bus);
 	list_add_tail(&clock->list, &phyter_clocks);
 out:
@@ -1509,7 +1503,6 @@ static void dp83640_remove(struct phy_device *phydev)
 		mutex_destroy(&clock->extreg_lock);
 		mutex_destroy(&clock->clock_lock);
 		put_device(&clock->bus->dev);
-		kfree(clock->caps.pin_config);
 		kfree(clock);
 	}
 }
-- 
2.43.0