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Subject[PATCH 4/8] pinctrl: implement pinctrl_check_ops
Date
Most code assumes that the pinctrl ops are present. Validate this when
registering a pinctrl driver. Remove the one place in the code that
was checking whether one of these non-optional ops was present.

Signed-off-by: Stephen Warren <swarren@wwwdotorg.org>
---
drivers/pinctrl/core.c | 25 +++++++++++++++++++++----
1 files changed, 21 insertions(+), 4 deletions(-)
diff --git a/drivers/pinctrl/core.c b/drivers/pinctrl/core.c
index ec3b8cc..df6296c 100644
--- a/drivers/pinctrl/core.c
+++ b/drivers/pinctrl/core.c
@@ -908,10 +908,6 @@ static int pinctrl_groups_show(struct seq_file *s, void *what)
const struct pinctrl_ops *ops = pctldev->desc->pctlops;
unsigned selector = 0;

- /* No grouping */
- if (!ops)
- return 0;
-
mutex_lock(&pinctrl_mutex);

seq_puts(s, "registered pin groups:\n");
@@ -1225,6 +1221,19 @@ static void pinctrl_remove_device_debugfs(struct pinctrl_dev *pctldev)

#endif

+static int pinctrl_check_ops(struct pinctrl_dev *pctldev)
+{
+ const struct pinctrl_ops *ops = pctldev->desc->pctlops;
+
+ if (!ops ||
+ !ops->list_groups ||
+ !ops->get_group_name ||
+ !ops->get_group_pins)
+ return -EINVAL;
+
+ return 0;
+}
+
/**
* pinctrl_register() - register a pin controller device
* @pctldesc: descriptor for this pin controller
@@ -1256,6 +1265,14 @@ struct pinctrl_dev *pinctrl_register(struct pinctrl_desc *pctldesc,
INIT_LIST_HEAD(&pctldev->gpio_ranges);
pctldev->dev = dev;

+ /* check core ops for sanity */
+ ret = pinctrl_check_ops(pctldev);
+ if (ret) {
+ pr_err("%s pinctrl ops lacks necessary functions\n",
+ pctldesc->name);
+ goto out_err;
+ }
+
/* If we're implementing pinmuxing, check the ops for sanity */
if (pctldesc->pmxops) {
ret = pinmux_check_ops(pctldev);
--
1.7.0.4


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