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Message-ID: <20180915013223.179909-15-alexander.levin@microsoft.com>
Date: Sat, 15 Sep 2018 01:32:38 +0000
From: Sasha Levin <Alexander.Levin@...rosoft.com>
To: "stable@...r.kernel.org" <stable@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC: Tony Lindgren <tony@...mide.com>,
Christ van Willegen <cvwillegen@...il.com>,
Haojian Zhuang <haojian.zhuang@...aro.org>,
Paul Cercueil <paul@...pouillou.net>,
Sean Wang <sean.wang@...iatek.com>,
Linus Walleij <linus.walleij@...aro.org>,
Sasha Levin <Alexander.Levin@...rosoft.com>
Subject: [PATCH AUTOSEL 4.14 15/57] pinctrl: rza1: Fix selector use for groups
and functions
From: Tony Lindgren <tony@...mide.com>
[ Upstream commit dc4003d260594aa300028c3c5d040c5719abd19b ]
We must use a mutex around the generic_add functions and save the
function and group selector in case we need to remove them. Otherwise
the selector use will be racy for deferred probe at least.
Fixes: 5a49b644b307 ("pinctrl: Renesas RZ/A1 pin and gpio controller")
Reported-by: H. Nikolaus Schaller <hns@...delico.com>
Cc: Christ van Willegen <cvwillegen@...il.com>
Cc: Haojian Zhuang <haojian.zhuang@...aro.org>
Cc: Paul Cercueil <paul@...pouillou.net>
Cc: Sean Wang <sean.wang@...iatek.com>
Acked-by: Jacopo Mondi <jacopo@...ndi.org>
Signed-off-by: Tony Lindgren <tony@...mide.com>
Tested-By: H. Nikolaus Schaller <hns@...delico.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>
Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
---
drivers/pinctrl/pinctrl-rza1.c | 24 +++++++++++++-----------
1 file changed, 13 insertions(+), 11 deletions(-)
diff --git a/drivers/pinctrl/pinctrl-rza1.c b/drivers/pinctrl/pinctrl-rza1.c
index 04d058706b80..a865dc56a491 100644
--- a/drivers/pinctrl/pinctrl-rza1.c
+++ b/drivers/pinctrl/pinctrl-rza1.c
@@ -878,6 +878,7 @@ static int rza1_dt_node_to_map(struct pinctrl_dev *pctldev,
const char *grpname;
const char **fngrps;
int ret, npins;
+ int gsel, fsel;
npins = rza1_dt_node_pin_count(np);
if (npins < 0) {
@@ -927,18 +928,19 @@ static int rza1_dt_node_to_map(struct pinctrl_dev *pctldev,
fngrps[0] = grpname;
mutex_lock(&rza1_pctl->mutex);
- ret = pinctrl_generic_add_group(pctldev, grpname, grpins, npins,
- NULL);
- if (ret) {
+ gsel = pinctrl_generic_add_group(pctldev, grpname, grpins, npins,
+ NULL);
+ if (gsel < 0) {
mutex_unlock(&rza1_pctl->mutex);
- return ret;
+ return gsel;
}
- ret = pinmux_generic_add_function(pctldev, grpname, fngrps, 1,
- mux_confs);
- if (ret)
+ fsel = pinmux_generic_add_function(pctldev, grpname, fngrps, 1,
+ mux_confs);
+ if (fsel < 0) {
+ ret = fsel;
goto remove_group;
- mutex_unlock(&rza1_pctl->mutex);
+ }
dev_info(rza1_pctl->dev, "Parsed function and group %s with %d pins\n",
grpname, npins);
@@ -955,15 +957,15 @@ static int rza1_dt_node_to_map(struct pinctrl_dev *pctldev,
(*map)->data.mux.group = np->name;
(*map)->data.mux.function = np->name;
*num_maps = 1;
+ mutex_unlock(&rza1_pctl->mutex);
return 0;
remove_function:
- mutex_lock(&rza1_pctl->mutex);
- pinmux_generic_remove_last_function(pctldev);
+ pinmux_generic_remove_function(pctldev, fsel);
remove_group:
- pinctrl_generic_remove_last_group(pctldev);
+ pinctrl_generic_remove_group(pctldev, gsel);
mutex_unlock(&rza1_pctl->mutex);
dev_info(rza1_pctl->dev, "Unable to parse function and group %s\n",
--
2.17.1
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