macintosh: Use kmemdup rather than duplicating its implementation

kmemdup is introduced to duplicate a region of memory in a neat way.
Rather than kmalloc/kzalloc + memcpy, which the programmer needs to
write the size twice (sometimes lead to mistakes), kmemdup improves
readability, leads to smaller code and also reduce the chances of mistakes.
Suggestion to use kmemdup rather than using kmalloc/kzalloc + memcpy.

Signed-off-by: Fuqian Huang <huangfq.daxian@gmail.com>
[chleroy: Fixed parenthesis alignment]
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20190703162821.32322-1-huangfq.daxian@gmail.com

diff --git a/drivers/macintosh/adbhid.c b/drivers/macintosh/adbhid.c
index 994ba5cb367898060076cdd52a47d043f9380a00..1d355aa9a1ddd74fd3b71c2b2c56434a6f5e1777 100644 (file)
--- a/drivers/macintosh/adbhid.c
+++ b/drivers/macintosh/adbhid.c
@@ -789,7 +789,8 @@ adbhid_input_register(int id, int default_id, int original_handler_id,
 
        switch (default_id) {
        case ADB_KEYBOARD:
-               hid->keycode = kmalloc(sizeof(adb_to_linux_keycodes), GFP_KERNEL);
+               hid->keycode = kmemdup(adb_to_linux_keycodes,
+                                      sizeof(adb_to_linux_keycodes), GFP_KERNEL);
                if (!hid->keycode) {
                        err = -ENOMEM;
                        goto fail;
@@ -797,8 +798,6 @@ adbhid_input_register(int id, int default_id, int original_handler_id,
 
                sprintf(hid->name, "ADB keyboard");
 
-               memcpy(hid->keycode, adb_to_linux_keycodes, sizeof(adb_to_linux_keycodes));
-
                switch (original_handler_id) {
                default:
                        keyboard_type = "<unknown>";