Input: elants_i2c - detect enum overflow

If an enum value were to get added without updating this switch
statement, the unreachable() annotation would trigger undefined
behavior, causing execution to fall through the end of the function,
into the next one.

Make the error handling more robust for an unexpected enum value, by
doing BUG() instead of unreachable().

Fixes the following objtool warning:

  drivers/input/touchscreen/elants_i2c.o: warning: objtool: elants_i2c_initialize() falls through to next function elants_i2c_resume()

Reported-by: Randy Dunlap <rdunlap@infradead.org>
Acked-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Reviewed-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Link: https://lore.kernel.org/r/59e2e82d1e40df11ab38874c03556a31c6b2f484.1612974132.git.jpoimboe@redhat.com
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

diff --git a/drivers/input/touchscreen/elants_i2c.c b/drivers/input/touchscreen/elants_i2c.c
index 6f57ec579f006dfeae2163e0a602e2f3f5057c96..4c2b579f6c8bf35a07a22ca0d95db620defff79a 100644 (file)
--- a/drivers/input/touchscreen/elants_i2c.c
+++ b/drivers/input/touchscreen/elants_i2c.c
@@ -656,8 +656,7 @@ static int elants_i2c_initialize(struct elants_data *ts)
                        error = elants_i2c_query_ts_info_ektf(ts);
                break;
        default:
-               unreachable();
-               break;
+               BUG();
        }
 
        if (error)