add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/net/phy/phy.c
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@@ -56,6 +56,18 @@
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 	return NULL;
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 }
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+static void phy_process_state_change(struct phy_device *phydev,
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+				     enum phy_state old_state)
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+{
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+	if (old_state != phydev->state) {
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+		phydev_dbg(phydev, "PHY state change %s -> %s\n",
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+			   phy_state_to_str(old_state),
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+			   phy_state_to_str(phydev->state));
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+		if (phydev->drv && phydev->drv->link_change_notify)
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+			phydev->drv->link_change_notify(phydev);
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+	}
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+}
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+
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 static void phy_link_up(struct phy_device *phydev)
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 {
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 	phydev->phy_link_change(phydev, true);
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@@ -1110,6 +1122,7 @@
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 void phy_stop(struct phy_device *phydev)
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 {
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 	struct net_device *dev = phydev->attached_dev;
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+	enum phy_state old_state;
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 	if (!phy_is_started(phydev) && phydev->state != PHY_DOWN) {
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 		WARN(1, "called from state %s\n",
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@@ -1118,6 +1131,7 @@
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 	}
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 	mutex_lock(&phydev->lock);
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+	old_state = phydev->state;
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 	if (phydev->state == PHY_CABLETEST) {
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 		phy_abort_cable_test(phydev);
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@@ -1128,6 +1142,7 @@
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 		sfp_upstream_stop(phydev->sfp_bus);
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 	phydev->state = PHY_HALTED;
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+	phy_process_state_change(phydev, old_state);
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 	mutex_unlock(&phydev->lock);
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@@ -1242,13 +1257,7 @@
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 	if (err < 0)
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 		phy_error(phydev);
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-	if (old_state != phydev->state) {
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-		phydev_dbg(phydev, "PHY state change %s -> %s\n",
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-			   phy_state_to_str(old_state),
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-			   phy_state_to_str(phydev->state));
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-		if (phydev->drv && phydev->drv->link_change_notify)
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-			phydev->drv->link_change_notify(phydev);
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-	}
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+	phy_process_state_change(phydev, old_state);
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 	/* Only re-schedule a PHY state machine change if we are polling the
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 	 * PHY, if PHY_IGNORE_INTERRUPT is set, then we will be moving