extcon: Fix hang and extcon_get/set_cable_state().

Users of find_cable_index_by_name() will cause a kernel hang
as the while loop counter is never incremented and end condition
is never reached.

extcon_get_cable_state() and extcon_set_cable_state() are broken
because they use cable index instead of cable id. This causes
the first cable state (cable.0) to be always invalid in sysfs
or extcon_get_cable_state() users.

Introduce a new function find_cable_id_by_name() that fixes
both of the above issues.

Fixes: commit 73b6ecdb93e8 ("extcon: Redefine the unique id of supported external connectors without 'enum extcon' type")
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Roger Quadros <rogerq@ti.com>
Tested-by: Ivan T. Ivanov <ivan.ivanov@linaro.org>
[cw00.choi: Fix minor coding style]
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>

diff --git a/drivers/extcon/extcon.c b/drivers/extcon/extcon.c
index 76157ab..0e2af17 100644 (file)
--- a/drivers/extcon/extcon.c
+++ b/drivers/extcon/extcon.c
@@ -124,25 +124,35 @@ static int find_cable_index_by_id(struct extcon_dev *edev, const unsigned int id
        return -EINVAL;
 }
 
-static int find_cable_index_by_name(struct extcon_dev *edev, const char *name)
+static int find_cable_id_by_name(struct extcon_dev *edev, const char *name)
 {
-       unsigned int id = EXTCON_NONE;
+       unsigned int id = -EINVAL;
        int i = 0;
 
-       if (edev->max_supported == 0)
-               return -EINVAL;
-
-       /* Find the the number of extcon cable */
+       /* Find the id of extcon cable */
        while (extcon_name[i]) {
                if (!strncmp(extcon_name[i], name, CABLE_NAME_MAX)) {
                        id = i;
                        break;
                }
+               i++;
        }
 
-       if (id == EXTCON_NONE)
+       return id;
+}
+
+static int find_cable_index_by_name(struct extcon_dev *edev, const char *name)
+{
+       unsigned int id;
+
+       if (edev->max_supported == 0)
                return -EINVAL;
 
+       /* Find the the number of extcon cable */
+       id = find_cable_id_by_name(edev, name);
+       if (id < 0)
+               return id;
+
        return find_cable_index_by_id(edev, id);
 }
 
@@ -228,9 +238,11 @@ static ssize_t cable_state_show(struct device *dev,
        struct extcon_cable *cable = container_of(attr, struct extcon_cable,
                                                  attr_state);
 
+       int i = cable->cable_index;
+
        return sprintf(buf, "%d\n",
                       extcon_get_cable_state_(cable->edev,
-                                              cable->cable_index));
+                                              cable->edev->supported_cable[i]));
 }
 
 /**
@@ -361,8 +373,13 @@ EXPORT_SYMBOL_GPL(extcon_get_cable_state_);
  */
 int extcon_get_cable_state(struct extcon_dev *edev, const char *cable_name)
 {
-       return extcon_get_cable_state_(edev, find_cable_index_by_name
-                                               (edev, cable_name));
+       unsigned int id;
+
+       id = find_cable_id_by_name(edev, cable_name);
+       if (id < 0)
+               return id;
+
+       return extcon_get_cable_state_(edev, id);
 }
 EXPORT_SYMBOL_GPL(extcon_get_cable_state);
 
@@ -404,8 +421,13 @@ EXPORT_SYMBOL_GPL(extcon_set_cable_state_);
 int extcon_set_cable_state(struct extcon_dev *edev,
                        const char *cable_name, bool cable_state)
 {
-       return extcon_set_cable_state_(edev, find_cable_index_by_name
-                                       (edev, cable_name), cable_state);
+       unsigned int id;
+
+       id = find_cable_id_by_name(edev, cable_name);
+       if (id < 0)
+               return id;
+
+       return extcon_set_cable_state_(edev, id, cable_state);
 }
 EXPORT_SYMBOL_GPL(extcon_set_cable_state);