Patch "pinctrl: avoid reload of p state in list iteration" has been added to the 5.4-stable tree

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This is a note to let you know that I've just added the patch titled

    pinctrl: avoid reload of p state in list iteration

to the 5.4-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     pinctrl-avoid-reload-of-p-state-in-list-iteration.patch
and it can be found in the queue-5.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From 4198a9b571065978632276264e01d71d68000ac5 Mon Sep 17 00:00:00 2001
From: Maria Yu <quic_aiquny@xxxxxxxxxxx>
Date: Wed, 15 Nov 2023 18:28:24 +0800
Subject: pinctrl: avoid reload of p state in list iteration

From: Maria Yu <quic_aiquny@xxxxxxxxxxx>

commit 4198a9b571065978632276264e01d71d68000ac5 upstream.

When in the list_for_each_entry iteration, reload of p->state->settings
with a local setting from old_state will turn the list iteration into an
infinite loop.

The typical symptom when the issue happens, will be a printk message like:

  "not freeing pin xx (xxx) as part of deactivating group xxx - it is
already used for some other setting".

This is a compiler-dependent problem, one instance occurred using Clang
version 10.0 on the arm64 architecture with linux version 4.19.

Fixes: 6e5e959dde0d ("pinctrl: API changes to support multiple states per device")
Signed-off-by: Maria Yu <quic_aiquny@xxxxxxxxxxx>
Cc:  <stable@xxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20231115102824.23727-1-quic_aiquny@xxxxxxxxxxx
Signed-off-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/pinctrl/core.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

--- a/drivers/pinctrl/core.c
+++ b/drivers/pinctrl/core.c
@@ -1237,17 +1237,17 @@ static void pinctrl_link_add(struct pinc
 static int pinctrl_commit_state(struct pinctrl *p, struct pinctrl_state *state)
 {
 	struct pinctrl_setting *setting, *setting2;
-	struct pinctrl_state *old_state = p->state;
+	struct pinctrl_state *old_state = READ_ONCE(p->state);
 	int ret;
 
-	if (p->state) {
+	if (old_state) {
 		/*
 		 * For each pinmux setting in the old state, forget SW's record
 		 * of mux owner for that pingroup. Any pingroups which are
 		 * still owned by the new state will be re-acquired by the call
 		 * to pinmux_enable_setting() in the loop below.
 		 */
-		list_for_each_entry(setting, &p->state->settings, node) {
+		list_for_each_entry(setting, &old_state->settings, node) {
 			if (setting->type != PIN_MAP_TYPE_MUX_GROUP)
 				continue;
 			pinmux_disable_setting(setting);


Patches currently in stable-queue which might be from quic_aiquny@xxxxxxxxxxx are

queue-5.4/pinctrl-avoid-reload-of-p-state-in-list-iteration.patch



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