This is a note to let you know that I've just added the patch titled
pinctrl: renesas: rzg2l: Fix locking in rzg2l_dt_subnode_to_map()
to the 6.8-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-renesas-rzg2l-fix-locking-in-rzg2l_dt_subnod.patch
and it can be found in the queue-6.8 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 21cd10c7378ee17f8ec3b93b37e27b5949d3a7e2
Author: Claudiu Beznea <claudiu.beznea.uj@xxxxxxxxxxxxxx>
Date: Mon Jan 15 17:34:53 2024 +0200
pinctrl: renesas: rzg2l: Fix locking in rzg2l_dt_subnode_to_map()
[ Upstream commit bd433c25ca81b2ac6dca7ea288a8474eea4fb8a0 ]
Commit d3aaa7203a17 ("pinctrl: renesas: rzg2l: Add pin configuration
support for pinmux groups") introduced the possibility to parse pin
configuration for pinmux groups. It did that by calling
rzg2l_map_add_config() at the end of rzg2l_dt_subnode_to_map() and
jumping to the remove_group label in case rzg2l_map_add_config() failed.
But if that happens, the mutex will already be unlocked, thus this it will
lead to double mutex unlock operation. To fix this move the
rzg2l_map_add_config() call just after all the name argument is ready and
before the mutex is locked. There is no harm in doing this, as this only
parses the data from device tree that will be further processed by
pinctrl core code.
Fixes: d3aaa7203a17 ("pinctrl: renesas: rzg2l: Add pin configuration support for pinmux groups")
Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Closes: https://lore.kernel.org/all/f8c3a3a0-7c48-4e40-8af0-ed4e9d9b049f@moroto.mountain
Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@xxxxxxxxxxxxxx>
Reviewed-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
Link: https://lore.kernel.org/r/20240115153453.99226-1-claudiu.beznea.uj@xxxxxxxxxxxxxx
Signed-off-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/pinctrl/renesas/pinctrl-rzg2l.c b/drivers/pinctrl/renesas/pinctrl-rzg2l.c
index 80fb5011c7bbc..01ef6921cb35c 100644
--- a/drivers/pinctrl/renesas/pinctrl-rzg2l.c
+++ b/drivers/pinctrl/renesas/pinctrl-rzg2l.c
@@ -447,6 +447,16 @@ static int rzg2l_dt_subnode_to_map(struct pinctrl_dev *pctldev,
name = np->name;
}
+ if (num_configs) {
+ ret = rzg2l_map_add_config(&maps[idx], name,
+ PIN_MAP_TYPE_CONFIGS_GROUP,
+ configs, num_configs);
+ if (ret < 0)
+ goto done;
+
+ idx++;
+ }
+
mutex_lock(&pctrl->mutex);
/* Register a single pin group listing all the pins we read from DT */
@@ -474,16 +484,6 @@ static int rzg2l_dt_subnode_to_map(struct pinctrl_dev *pctldev,
maps[idx].data.mux.function = name;
idx++;
- if (num_configs) {
- ret = rzg2l_map_add_config(&maps[idx], name,
- PIN_MAP_TYPE_CONFIGS_GROUP,
- configs, num_configs);
- if (ret < 0)
- goto remove_group;
-
- idx++;
- }
-
dev_dbg(pctrl->dev, "Parsed %pOF with %d pins\n", np, num_pinmux);
ret = 0;
goto done;
