extcon: return error code on failure

Function get_zeroed_page() returns a NULL pointer if there is no enough
memory. In function extcon_sync(), it returns 0 if the call to
get_zeroed_page() fails. The return value 0 indicates success in the
context, which is incosistent with the execution status. This patch
fixes the bug by returning -ENOMEM.

Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=188611

Signed-off-by: Pan Bian <bianpan2016@163.com>
Fixes: a580982f0836e
Cc: stable <stable@vger.kernel.org>
Acked-by: Chanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/extcon/extcon.c b/drivers/extcon/extcon.c
index 78298460d1686a79864c57d228ac6af5e114acf9..7c1e3a7b14e0c1f540a0bbe7d6b924b124561729 100644 (file)
--- a/drivers/extcon/extcon.c
+++ b/drivers/extcon/extcon.c
@@ -453,7 +453,7 @@ int extcon_sync(struct extcon_dev *edev, unsigned int id)
                dev_err(&edev->dev, "out of memory in extcon_set_state\n");
                kobject_uevent(&edev->dev.kobj, KOBJ_CHANGE);
 
-               return 0;
+               return -ENOMEM;
        }
 
        length = name_show(&edev->dev, NULL, prop_buf);