kernel: copy kernel 4.19 code to 5.4

No changes were done to the patches while coping them. Currently they do
not apply on top of kernel 5.4.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

1 files changed, 124 insertions, 0 deletions

diff --git a/target/linux/generic/backport-5.4/720-v5.5-net-sfp-move-sfp-sub-state-machines-into-separate-fu.patch b/target/linux/generic/backport-5.4/720-v5.5-net-sfp-move-sfp-sub-state-machines-into-separate-fu.patch
new file mode 100644
index 0000000000..2f90b00438
--- /dev/null
+++ b/target/linux/generic/backport-5.4/720-v5.5-net-sfp-move-sfp-sub-state-machines-into-separate-fu.patch
@@ -0,0 +1,124 @@
+From b9d6ed5cdb67533feda7f221eb06f2f9f1ff5047 Mon Sep 17 00:00:00 2001
+From: Russell King <rmk+kernel@armlinux.org.uk>
+Date: Fri, 11 Oct 2019 19:33:58 +0100
+Subject: [PATCH 618/660] net: sfp: move sfp sub-state machines into separate
+ functions
+
+Move the SFP sub-state machines out of the main state machine function,
+in preparation for it doing a bit more with the device state.  By doing
+so, we ensure that our debug after the main state machine is always
+printed.
+
+Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
+---
+ drivers/net/phy/sfp.c | 74 +++++++++++++++++++++++++------------------
+ 1 file changed, 43 insertions(+), 31 deletions(-)
+
+--- a/drivers/net/phy/sfp.c
++++ b/drivers/net/phy/sfp.c
+@@ -1479,19 +1479,34 @@ static void sfp_sm_mod_remove(struct sfp
+ 	dev_info(sfp->dev, "module removed\n");
+ }
+ 
+-static void sfp_sm_event(struct sfp *sfp, unsigned int event)
++/* This state machine tracks the netdev up/down state */
++static void sfp_sm_device(struct sfp *sfp, unsigned int event)
+ {
+-	mutex_lock(&sfp->sm_mutex);
++	switch (sfp->sm_dev_state) {
++	default:
++		if (event == SFP_E_DEV_UP)
++			sfp->sm_dev_state = SFP_DEV_UP;
++		break;
+ 
+-	dev_dbg(sfp->dev, "SM: enter %s:%s:%s event %s\n",
+-		mod_state_to_str(sfp->sm_mod_state),
+-		dev_state_to_str(sfp->sm_dev_state),
+-		sm_state_to_str(sfp->sm_state),
+-		event_to_str(event));
++	case SFP_DEV_UP:
++		if (event == SFP_E_DEV_DOWN) {
++			/* If the module has a PHY, avoid raising TX disable
++			 * as this resets the PHY. Otherwise, raise it to
++			 * turn the laser off.
++			 */
++			if (!sfp->mod_phy)
++				sfp_module_tx_disable(sfp);
++			sfp->sm_dev_state = SFP_DEV_DOWN;
++		}
++		break;
++	}
++}
+ 
+-	/* This state machine tracks the insert/remove state of
+-	 * the module, and handles probing the on-board EEPROM.
+-	 */
++/* This state machine tracks the insert/remove state of
++ * the module, and handles probing the on-board EEPROM.
++ */
++static void sfp_sm_module(struct sfp *sfp, unsigned int event)
++{
+ 	switch (sfp->sm_mod_state) {
+ 	default:
+ 		if (event == SFP_E_INSERT && sfp->attached) {
+@@ -1531,27 +1546,10 @@ static void sfp_sm_event(struct sfp *sfp
+ 		}
+ 		break;
+ 	}
++}
+ 
+-	/* This state machine tracks the netdev up/down state */
+-	switch (sfp->sm_dev_state) {
+-	default:
+-		if (event == SFP_E_DEV_UP)
+-			sfp->sm_dev_state = SFP_DEV_UP;
+-		break;
+-
+-	case SFP_DEV_UP:
+-		if (event == SFP_E_DEV_DOWN) {
+-			/* If the module has a PHY, avoid raising TX disable
+-			 * as this resets the PHY. Otherwise, raise it to
+-			 * turn the laser off.
+-			 */
+-			if (!sfp->mod_phy)
+-				sfp_module_tx_disable(sfp);
+-			sfp->sm_dev_state = SFP_DEV_DOWN;
+-		}
+-		break;
+-	}
+-
++static void sfp_sm_main(struct sfp *sfp, unsigned int event)
++{
+ 	/* Some events are global */
+ 	if (sfp->sm_state != SFP_S_DOWN &&
+ 	    (sfp->sm_mod_state != SFP_MOD_PRESENT ||
+@@ -1562,7 +1560,6 @@ static void sfp_sm_event(struct sfp *sfp
+ 		if (sfp->mod_phy)
+ 			sfp_sm_phy_detach(sfp);
+ 		sfp_sm_next(sfp, SFP_S_DOWN, 0);
+-		mutex_unlock(&sfp->sm_mutex);
+ 		return;
+ 	}
+ 
+@@ -1617,6 +1614,21 @@ static void sfp_sm_event(struct sfp *sfp
+ 	case SFP_S_TX_DISABLE:
+ 		break;
+ 	}
++}
++
++static void sfp_sm_event(struct sfp *sfp, unsigned int event)
++{
++	mutex_lock(&sfp->sm_mutex);
++
++	dev_dbg(sfp->dev, "SM: enter %s:%s:%s event %s\n",
++		mod_state_to_str(sfp->sm_mod_state),
++		dev_state_to_str(sfp->sm_dev_state),
++		sm_state_to_str(sfp->sm_state),
++		event_to_str(event));
++
++	sfp_sm_module(sfp, event);
++	sfp_sm_device(sfp, event);
++	sfp_sm_main(sfp, event);
+ 
+ 	dev_dbg(sfp->dev, "SM: exit %s:%s:%s\n",
+ 		mod_state_to_str(sfp->sm_mod_state),