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| author | Dong Aisheng <dong.aisheng@linaro.org> | 2012-04-10 12:41:34 +0800 |
|---|---|---|
| committer | Linus Walleij <linus.walleij@linaro.org> | 2012-04-18 13:53:11 +0200 |
| commit | ad8bb720c23a80233e45ed31d67458f5e5b7ab31 (patch) | |
| tree | 6b1da7d3dc99bacd03167a0235785e3f881b03b3 /drivers/pinctrl/pinconf.c | |
| parent | a1d31f71e6ed2f714830df8885ec07dfe1f6632e (diff) | |
| download | linux-ad8bb720c23a80233e45ed31d67458f5e5b7ab31.tar.gz linux-ad8bb720c23a80233e45ed31d67458f5e5b7ab31.tar.bz2 linux-ad8bb720c23a80233e45ed31d67458f5e5b7ab31.zip | |
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>
Diffstat (limited to 'drivers/pinctrl/pinconf.c')
| -rw-r--r-- | drivers/pinctrl/pinconf.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/pinctrl/pinconf.c b/drivers/pinctrl/pinconf.c index eb3a14f4b866..384dcc166e44 100644 --- a/drivers/pinctrl/pinconf.c +++ b/drivers/pinctrl/pinconf.c @@ -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"); |