[PATCH 2/4] HID: input: do not append a suffix if the name already has it

[Benjamin Tissoires]

Or it creates some weird input names like:
"MI Dongle MI Wireless Mouse Mouse"

Signed-off-by: Benjamin Tissoires <benjamin.tissoi...@redhat.com>
---
 drivers/hid/hid-input.c | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/drivers/hid/hid-input.c b/drivers/hid/hid-input.c
index ac201817a2dd..1e9ba8f7a16b 100644
--- a/drivers/hid/hid-input.c
+++ b/drivers/hid/hid-input.c
@@ -1516,6 +1516,7 @@ static struct hid_input *hidinput_allocate(struct 
hid_device *hid,
        struct hid_input *hidinput = kzalloc(sizeof(*hidinput), GFP_KERNEL);
        struct input_dev *input_dev = input_allocate_device();
        const char *suffix = NULL;
+       size_t suffix_len, name_len;
 
        if (!hidinput || !input_dev)
                goto fail;
@@ -1559,10 +1560,15 @@ static struct hid_input *hidinput_allocate(struct 
hid_device *hid,
        }
 
        if (suffix) {
-               hidinput->name = kasprintf(GFP_KERNEL, "%s %s",
-                                          hid->name, suffix);
-               if (!hidinput->name)
-                       goto fail;
+               name_len = strlen(hid->name);
+               suffix_len = strlen(suffix);
+               if ((name_len < suffix_len) ||
+                   strcmp(hid->name + name_len - suffix_len, suffix)) {
+                       hidinput->name = kasprintf(GFP_KERNEL, "%s %s",
+                                                  hid->name, suffix);
+                       if (!hidinput->name)
+                               goto fail;
+               }
        }
 
        input_set_drvdata(input_dev, hid);
-- 
2.14.3