target/linux/generic/backport-5.4/727-v5.5-net-sfp-control-TX_DISABLE-and-phy-only-from-main-st.patch

From df5c4d93c5a59cba0f7479a4cd4e22b50726ce88 Mon Sep 17 00:00:00 2001
From: Russell King <rmk+kernel@armlinux.org.uk>
Date: Thu, 17 Oct 2019 11:12:42 +0100
Subject: [PATCH 625/660] net: sfp: control TX_DISABLE and phy only from main
 state machine

We initialise TX_DISABLE when the sfp cage is probed, and then
maintain its state in the main state machine.  However, the module
state machine:
- negates it when detecting a newly inserted module when it's already
  guaranteed to be negated.
- negates it when the module is removed, but the main state machine
  will do this anyway.

Make TX_DISABLE entirely controlled by the main state machine.

The main state machine also probes the module for a PHY, and removes
the PHY when the the module is removed.  Hence, removing the PHY in
sfp_sm_module_remove() is also redundant, and is a left-over from
when we tried to probe for the PHY from the module state machine.

Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
---
 drivers/net/phy/sfp.c | 9 +--------
 1 file changed, 1 insertion(+), 8 deletions(-)

--- a/drivers/net/phy/sfp.c
+++ b/drivers/net/phy/sfp.c
@@ -1557,11 +1557,6 @@ static void sfp_sm_mod_remove(struct sfp
 
 	sfp_hwmon_remove(sfp);
 
-	if (sfp->mod_phy)
-		sfp_sm_phy_detach(sfp);
-
-	sfp_module_tx_disable(sfp);
-
 	memset(&sfp->id, 0, sizeof(sfp->id));
 	sfp->module_power_mW = 0;
 
@@ -1599,10 +1594,8 @@ static void sfp_sm_module(struct sfp *sf
 
 	switch (sfp->sm_mod_state) {
 	default:
-		if (event == SFP_E_INSERT && sfp->attached) {
-			sfp_module_tx_disable(sfp);
+		if (event == SFP_E_INSERT && sfp->attached)
 			sfp_sm_mod_next(sfp, SFP_MOD_PROBE, T_SERIAL);
-		}
 		break;
 
 	case SFP_MOD_PROBE: