pinctrl: msm: Check for ngpios > MAX_NR_GPIO

Fail the probe and print a warning if SoC specific drivers have
more GPIOs than there can be accounted for in the static bitmaps.
This should avoid silent corruption/failures in the future.

Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Acked-by: Bjorn Andersson <bjorn.andersson@sonymobile.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

1 files changed, 5 insertions, 1 deletions

diff --git a/drivers/pinctrl/pinctrl-msm.c b/drivers/pinctrl/pinctrl-msm.c
index 2df3a48974f3..e563bbc5cefc 100644
--- a/drivers/pinctrl/pinctrl-msm.c
+++ b/drivers/pinctrl/pinctrl-msm.c
@@ -897,10 +897,14 @@ static int msm_gpio_init(struct msm_pinctrl *pctrl)
         int ret;
         int i;
         int r;
+        unsigned ngpio = pctrl->soc->ngpios;
+
+        if (WARN_ON(ngpio > MAX_NR_GPIO))
+                return -EINVAL;
 
         chip = &pctrl->chip;
         chip->base = 0;
-        chip->ngpio = pctrl->soc->ngpios;
+        chip->ngpio = ngpio;
         chip->label = dev_name(pctrl->dev);
         chip->dev = pctrl->dev;
         chip->owner = THIS_MODULE;