From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tony Lindgren Subject: [PATCH 4/5] pinctrl: rza1: Fix selector use for groups and functions Date: Fri, 15 Jun 2018 04:11:40 -0700 Message-ID: <20180615111141.37184-5-tony@atomide.com> References: <20180615111141.37184-1-tony@atomide.com> Return-path: In-Reply-To: <20180615111141.37184-1-tony@atomide.com> Sender: linux-kernel-owner@vger.kernel.org To: Linus Walleij Cc: linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org, Haojian Zhuang , Jacopo Mondi , Paul Cercueil , Sean Wang List-Id: linux-gpio@vger.kernel.org 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 Cc: Haojian Zhuang Cc: Jacopo Mondi Cc: Paul Cercueil Cc: Sean Wang Signed-off-by: Tony Lindgren --- drivers/pinctrl/pinctrl-rza1.c | 25 +++++++++++++------------ 1 file changed, 13 insertions(+), 12 deletions(-) diff --git a/drivers/pinctrl/pinctrl-rza1.c b/drivers/pinctrl/pinctrl-rza1.c --- a/drivers/pinctrl/pinctrl-rza1.c +++ b/drivers/pinctrl/pinctrl-rza1.c @@ -1005,7 +1005,7 @@ static int rza1_dt_node_to_map(struct pinctrl_dev *pctldev, struct device_node *child; const char *grpname; const char **fngrps; - int ret, npins; + int ret, npins, gsel, fsel; npins = rza1_dt_node_pin_count(np); if (npins < 0) { @@ -1055,18 +1055,19 @@ 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); @@ -1083,15 +1084,15 @@ 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