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pinctrl: fix pinmux_hog_maps when ctrl_dev_name is not set

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The ctrl_dev_name is optional for struct pinmux_map assuming
that ctrl_dev is set. Without this patch we can get:

Unable to handle kernel NULL pointer dereference at virtual
address 00000000
...
(pinmux_hog_maps+0xa4/0x20c)
(pinctrl_register+0x2a4/0x378)
...

Fix this by adding adding a test for map->ctrl_dev.
Additionally move the test for map->ctrl_dev earlier
to optimize out the loop a bit.

Signed-off-by: Tony Lindgren <tony@atomide.com>
Acked-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Tony Lindgren 2012-01-20 07:43:53 -08:00 committed by Linus Walleij
parent de849eecd0
commit 9e2551e10b
1 changed files with 6 additions and 3 deletions
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9
drivers/pinctrl/pinmux.c
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@ -978,9 +978,12 @@ int pinmux_hog_maps(struct pinctrl_dev *pctldev)
for (i = 0; i < pinmux_maps_num; i++) {
struct pinmux_map const *map = &pinmux_maps[i];
if (((map->ctrl_dev == dev) ||
!strcmp(map->ctrl_dev_name, devname)) &&
map->hog_on_boot) {
if (!map->hog_on_boot)
continue;
if ((map->ctrl_dev == dev) ||
(map->ctrl_dev_name &&
!strcmp(map->ctrl_dev_name, devname))) {
/* OK time to hog! */
ret = pinmux_hog_map(pctldev, map);
if (ret)