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>
-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;
- 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;
}
while (extcon_name[i]) {
if (!strncmp(extcon_name[i], name, CABLE_NAME_MAX)) {
id = i;
break;
}
+ return id;
+}
+
+static int find_cable_index_by_name(struct extcon_dev *edev, const char *name)
+{
+ unsigned int id;
+
+ if (edev->max_supported == 0)
+ /* 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);
}
return find_cable_index_by_id(edev, id);
}
struct extcon_cable *cable = container_of(attr, struct extcon_cable,
attr_state);
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,
return sprintf(buf, "%d\n",
extcon_get_cable_state_(cable->edev,
+ cable->edev->supported_cable[i]));
*/
int extcon_get_cable_state(struct extcon_dev *edev, const char *cable_name)
{
*/
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);
}
EXPORT_SYMBOL_GPL(extcon_get_cable_state);
int extcon_set_cable_state(struct extcon_dev *edev,
const char *cable_name, bool 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);
}
EXPORT_SYMBOL_GPL(extcon_set_cable_state);