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, 53 insertions, 0 deletions

diff --git a/target/linux/generic/backport-5.4/723-v5.5-net-sfp-handle-module-remove-outside-state-machine.patch b/target/linux/generic/backport-5.4/723-v5.5-net-sfp-handle-module-remove-outside-state-machine.patch
new file mode 100644
index 0000000000..542aeaea77
--- /dev/null
+++ b/target/linux/generic/backport-5.4/723-v5.5-net-sfp-handle-module-remove-outside-state-machine.patch
@@ -0,0 +1,53 @@
+From d2591ea5520e2ee8fa557f96bb64c23cafac4b20 Mon Sep 17 00:00:00 2001
+From: Russell King <rmk+kernel@armlinux.org.uk>
+Date: Tue, 15 Oct 2019 10:33:13 +0100
+Subject: [PATCH 621/660] net: sfp: handle module remove outside state machine
+
+Removing a module resets the module state machine back to its initial
+state.  Rather than explicitly handling this in every state, handle it
+early on outside of the state machine.
+
+Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
+---
+ drivers/net/phy/sfp.c | 16 +++++++++-------
+ 1 file changed, 9 insertions(+), 7 deletions(-)
+
+--- a/drivers/net/phy/sfp.c
++++ b/drivers/net/phy/sfp.c
+@@ -1500,6 +1500,14 @@ static void sfp_sm_device(struct sfp *sf
+  */
+ static void sfp_sm_module(struct sfp *sfp, unsigned int event)
+ {
++	/* Handle remove event globally, it resets this state machine */
++	if (event == SFP_E_REMOVE) {
++		if (sfp->sm_mod_state > SFP_MOD_PROBE)
++			sfp_sm_mod_remove(sfp);
++		sfp_sm_mod_next(sfp, SFP_MOD_EMPTY, 0);
++		return;
++	}
++
+ 	switch (sfp->sm_mod_state) {
+ 	default:
+ 		if (event == SFP_E_INSERT && sfp->attached) {
+@@ -1509,9 +1517,7 @@ static void sfp_sm_module(struct sfp *sf
+ 		break;
+ 
+ 	case SFP_MOD_PROBE:
+-		if (event == SFP_E_REMOVE) {
+-			sfp_sm_mod_next(sfp, SFP_MOD_EMPTY, 0);
+-		} else if (event == SFP_E_TIMEOUT) {
++		if (event == SFP_E_TIMEOUT) {
+ 			int val = sfp_sm_mod_probe(sfp);
+ 
+ 			if (val == 0)
+@@ -1533,10 +1539,6 @@ static void sfp_sm_module(struct sfp *sf
+ 		/* fallthrough */
+ 	case SFP_MOD_PRESENT:
+ 	case SFP_MOD_ERROR:
+-		if (event == SFP_E_REMOVE) {
+-			sfp_sm_mod_remove(sfp);
+-			sfp_sm_mod_next(sfp, SFP_MOD_EMPTY, 0);
+-		}
+ 		break;
+ 	}
+ }