pinctrl: tegra: Duplicate pinmux functions table

The function table is filled with group information based on other
instance-specific data at runtime. However, the function table can be
shared between multiple instances, causing the ->probe() function for
one instance to overwrite the table of a previously probed instance.

Fix this by sharing only the function names and allocating a separate
function table for each instance.

Fixes: 5a00473607 ("pinctrl: tegra: Separate Tegra194 instances")
Signed-off-by: Thierry Reding <treding@nvidia.com>
Link: https://lore.kernel.org/r/20230530105308.1292852-1-thierry.reding@gmail.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/tegra/pinctrl-tegra.c

@@ -232,7 +232,7 @@ static const char *tegra_pinctrl_get_func_name(struct pinctrl_dev *pctldev,
 {
 	struct tegra_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
 
-	return pmx->soc->functions[function].name;
+	return pmx->functions[function].name;
 }
 
 static int tegra_pinctrl_get_func_groups(struct pinctrl_dev *pctldev,
@@ -242,8 +242,8 @@ static int tegra_pinctrl_get_func_groups(struct pinctrl_dev *pctldev,
 {
 	struct tegra_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
 
-	*groups = pmx->soc->functions[function].groups;
-	*num_groups = pmx->soc->functions[function].ngroups;
+	*groups = pmx->functions[function].groups;
+	*num_groups = pmx->functions[function].ngroups;
 
 	return 0;
 }
@@ -795,10 +795,17 @@ int tegra_pinctrl_probe(struct platform_device *pdev,
 	if (!pmx->group_pins)
 		return -ENOMEM;
 
-	group_pins = pmx->group_pins;
-	for (fn = 0; fn < soc_data->nfunctions; fn++) {
-		struct tegra_function *func = &soc_data->functions[fn];
+	pmx->functions = devm_kcalloc(&pdev->dev, pmx->soc->nfunctions,
+				      sizeof(*pmx->functions), GFP_KERNEL);
+	if (!pmx->functions)
+		return -ENOMEM;
 
+	group_pins = pmx->group_pins;
+
+	for (fn = 0; fn < soc_data->nfunctions; fn++) {
+		struct tegra_function *func = &pmx->functions[fn];
+
+		func->name = pmx->soc->functions[fn];
 		func->groups = group_pins;
 
 		for (gn = 0; gn < soc_data->ngroups; gn++) {

drivers/pinctrl/tegra/pinctrl-tegra.h

@@ -13,6 +13,7 @@ struct tegra_pmx {
 	struct pinctrl_dev *pctl;
 
 	const struct tegra_pinctrl_soc_data *soc;
+	struct tegra_function *functions;
 	const char **group_pins;
 
 	struct pinctrl_gpio_range gpio_range;
@@ -191,7 +192,7 @@ struct tegra_pinctrl_soc_data {
 	const char *gpio_compatible;
 	const struct pinctrl_pin_desc *pins;
 	unsigned npins;
-	struct tegra_function *functions;
+	const char * const *functions;
 	unsigned nfunctions;
 	const struct tegra_pingroup *groups;
 	unsigned ngroups;

drivers/pinctrl/tegra/pinctrl-tegra114.c

@@ -1452,12 +1452,9 @@ enum tegra_mux {
 	TEGRA_MUX_VI_ALT3,
 };
 
-#define FUNCTION(fname)					\
-	{						\
-		.name = #fname,				\
-	}
+#define FUNCTION(fname) #fname
 
-static struct tegra_function tegra114_functions[] = {
+static const char * const tegra114_functions[] = {
 	FUNCTION(blink),
 	FUNCTION(cec),
 	FUNCTION(cldvfs),

drivers/pinctrl/tegra/pinctrl-tegra124.c

@@ -1611,12 +1611,9 @@ enum tegra_mux {
 	TEGRA_MUX_VIMCLK2_ALT,
 };
 
-#define FUNCTION(fname)					\
-	{						\
-		.name = #fname,				\
-	}
+#define FUNCTION(fname) #fname
 
-static struct tegra_function tegra124_functions[] = {
+static const char * const tegra124_functions[] = {
 	FUNCTION(blink),
 	FUNCTION(ccla),
 	FUNCTION(cec),

drivers/pinctrl/tegra/pinctrl-tegra194.c

@@ -1189,12 +1189,9 @@ enum tegra_mux_dt {
 };
 
 /* Make list of each function name */
-#define TEGRA_PIN_FUNCTION(lid)			\
-	{					\
-		.name = #lid,			\
-	}
+#define TEGRA_PIN_FUNCTION(lid) #lid
 
-static struct tegra_function tegra194_functions[] = {
+static const char * const tegra194_functions[] = {
 	TEGRA_PIN_FUNCTION(rsvd0),
 	TEGRA_PIN_FUNCTION(rsvd1),
 	TEGRA_PIN_FUNCTION(rsvd2),

drivers/pinctrl/tegra/pinctrl-tegra20.c

@@ -1889,12 +1889,9 @@ enum tegra_mux {
 	TEGRA_MUX_XIO,
 };
 
-#define FUNCTION(fname)					\
-	{						\
-		.name = #fname,				\
-	}
+#define FUNCTION(fname) #fname
 
-static struct tegra_function tegra20_functions[] = {
+static const char * const tegra20_functions[] = {
 	FUNCTION(ahb_clk),
 	FUNCTION(apb_clk),
 	FUNCTION(audio_sync),

drivers/pinctrl/tegra/pinctrl-tegra210.c

@@ -1185,12 +1185,9 @@ enum tegra_mux {
 	TEGRA_MUX_VIMCLK2,
 };
 
-#define FUNCTION(fname)					\
-	{						\
-		.name = #fname,				\
-	}
+#define FUNCTION(fname) #fname
 
-static struct tegra_function tegra210_functions[] = {
+static const char * const tegra210_functions[] = {
 	FUNCTION(aud),
 	FUNCTION(bcl),
 	FUNCTION(blink),

drivers/pinctrl/tegra/pinctrl-tegra30.c

@@ -2010,12 +2010,9 @@ enum tegra_mux {
 	TEGRA_MUX_VI_ALT3,
 };
 
-#define FUNCTION(fname)					\
-	{						\
-		.name = #fname,				\
-	}
+#define FUNCTION(fname) #fname
 
-static struct tegra_function tegra30_functions[] = {
+static const char * const tegra30_functions[] = {
 	FUNCTION(blink),
 	FUNCTION(cec),
 	FUNCTION(clk_12m_out),