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pinctrl: add some error checking for user interfaces 

This patch can avoid kernel oops in case the mux or config
function is not supported by driver.

Acked-by: Stephen Warren <swarren@wwwdotorg.org>
Signed-off-by: Dong Aisheng <dong.aisheng@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
hifive-unleashed-5.1
Dong Aisheng 2012-04-10 12:41:34 +08:00 committed by Linus Walleij
parent a1d31f71e6
commit ad8bb720c2
2 changed files with 17 additions and 2 deletions
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4
drivers/pinctrl/pinconf.c
View File

@ -448,8 +448,12 @@ static void pinconf_dump_pin(struct pinctrl_dev *pctldev,
static int pinconf_pins_show(struct seq_file *s, void *what)
{
struct pinctrl_dev *pctldev = s->private;
const struct pinconf_ops *ops = pctldev->desc->confops;
unsigned i, pin;
if (!ops || !ops->pin_config_get)
return 0;
seq_puts(s, "Pin config settings per pin\n");
seq_puts(s, "Format: pin (name): pinmux setting array\n");

15
drivers/pinctrl/pinmux.c
View File

@ -323,6 +323,11 @@ int pinmux_map_to_setting(struct pinctrl_map const *map,
const unsigned *pins;
unsigned num_pins;
if (!pmxops) {
dev_err(pctldev->dev, "does not support mux function\n");
return -EINVAL;
}
setting->data.mux.func =
pinmux_func_name_to_selector(pctldev, map->data.mux.function);
if (setting->data.mux.func < 0)
@ -481,11 +486,14 @@ static int pinmux_functions_show(struct seq_file *s, void *what)
{
struct pinctrl_dev *pctldev = s->private;
const struct pinmux_ops *pmxops = pctldev->desc->pmxops;
unsigned nfuncs = pmxops->get_functions_count(pctldev);
unsigned nfuncs;
unsigned func_selector = 0;
mutex_lock(&pinctrl_mutex);
if (!pmxops)
return 0;
mutex_lock(&pinctrl_mutex);
nfuncs = pmxops->get_functions_count(pctldev);
while (func_selector < nfuncs) {
const char *func = pmxops->get_function_name(pctldev,
func_selector);
@ -520,6 +528,9 @@ static int pinmux_pins_show(struct seq_file *s, void *what)
const struct pinmux_ops *pmxops = pctldev->desc->pmxops;
unsigned i, pin;
if (!pmxops)
return 0;
seq_puts(s, "Pinmux settings per pin\n");
seq_puts(s, "Format: pin (name): mux_owner gpio_owner hog?\n");