pinctrl: disallow map table entries with NULL dev_name field
Hog entries are mapping table entries with .ctrl_dev_name == .dev_name.
All other mapping table entries need .dev_name set so that they will
match some pinctrl_get() call. All extant PIN_MAP*() macros set
.dev_name.
So, there is no reason to allow mapping table entries without .dev_name
set. Update the code and documentation to disallow this.
Signed-off-by: Stephen Warren <swarren@nvidia.com>
Acked-by: Dong Aisheng <dong.aisheng@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
diff --git a/drivers/pinctrl/core.c b/drivers/pinctrl/core.c
index fb3fbb7..5411e32 100644
--- a/drivers/pinctrl/core.c
+++ b/drivers/pinctrl/core.c
@@ -479,24 +479,21 @@
static struct pinctrl *pinctrl_get_locked(struct device *dev, const char *name)
{
struct pinctrl_dev *pctldev = NULL;
- const char *devname = NULL;
+ const char *devname;
struct pinctrl *p;
- bool found_map;
unsigned num_maps = 0;
int ret = -ENODEV;
struct pinctrl_maps *maps_node;
int i;
struct pinctrl_map const *map;
- /* We must have dev or ID or both */
- if (!dev && !name)
+ /* We must have a dev name */
+ if (WARN_ON(!dev))
return ERR_PTR(-EINVAL);
- if (dev)
- devname = dev_name(dev);
+ devname = dev_name(dev);
- pr_debug("get pin control handle %s for device %s\n", name,
- devname ? devname : "(none)");
+ pr_debug("get pin control handle device %s state %s\n", devname, name);
/*
* create the state cookie holder struct pinctrl for each
@@ -511,8 +508,6 @@
/* Iterate over the pin control maps to locate the right ones */
for_each_maps(maps_node, i, map) {
- found_map = false;
-
/*
* First, try to find the pctldev given in the map
*/
@@ -529,6 +524,10 @@
pr_debug("in map, found pctldev %s to handle function %s",
dev_name(pctldev->dev), map->function);
+ /* Map must be for this device */
+ if (strcmp(map->dev_name, devname))
+ continue;
+
/*
* If we're looking for a specific named map, this must match,
* else we loop and look for the next.
@@ -540,30 +539,12 @@
continue;
}
- /*
- * This is for the case where no device name is given, we
- * already know that the function name matches from above
- * code.
- */
- if (!map->dev_name && (name != NULL))
- found_map = true;
-
- /* If the mapping has a device set up it must match */
- if (map->dev_name &&
- (!devname || !strcmp(map->dev_name, devname)))
- /* MATCH! */
- found_map = true;
-
- /* If this map is applicable, then apply it */
- if (found_map) {
- ret = pinmux_apply_muxmap(pctldev, p, dev,
- devname, map);
- if (ret) {
- kfree(p);
- return ERR_PTR(ret);
- }
- num_maps++;
+ ret = pinmux_apply_muxmap(pctldev, p, dev, devname, map);
+ if (ret) {
+ kfree(p);
+ return ERR_PTR(ret);
}
+ num_maps++;
}
/*
@@ -578,9 +559,7 @@
dev_info(dev, "zero maps found for mapping %s\n", name);
pr_debug("found %u mux maps for device %s, UD %s\n",
- num_maps,
- devname ? devname : "(anonymous)",
- name ? name : "(undefined)");
+ num_maps, devname, name ? name : "(undefined)");
/* Add the pinmux to the global list */
mutex_lock(&pinctrl_list_mutex);
@@ -707,14 +686,11 @@
return -EINVAL;
}
- if (!maps[i].dev_name)
- pr_debug("add system map %s function %s with no device\n",
- maps[i].name,
- maps[i].function);
- else
- pr_debug("register map %s, function %s\n",
- maps[i].name,
- maps[i].function);
+ if (!maps[i].dev_name) {
+ pr_err("failed to register map %s (%d): no device given\n",
+ maps[i].name, i);
+ return -EINVAL;
+ }
}
maps_node = kzalloc(sizeof(*maps_node), GFP_KERNEL);
@@ -938,13 +914,8 @@
mutex_lock(&pinctrl_maps_mutex);
for_each_maps(maps_node, i, map) {
seq_printf(s, "%s:\n", map->name);
- if (map->dev_name)
- seq_printf(s, " device: %s\n",
- map->dev_name);
- else
- seq_printf(s, " SYSTEM MUX\n");
- seq_printf(s, " controlling device %s\n",
- map->ctrl_dev_name);
+ seq_printf(s, " device: %s\n", map->dev_name);
+ seq_printf(s, " controlling device %s\n", map->ctrl_dev_name);
seq_printf(s, " function: %s\n", map->function);
seq_printf(s, " group: %s\n", map->group ? map->group :
"(default)");