Revert "kconfig: tristate choices with mixed tristate and boolean values"

This reverts commit a5bf3d89.

David Brownell notes that this causes a regression visible in the
drivers/usb/gadget Kconfig file:

  "That Kconfig hasn't changed (other than adding new drivers), and it's
   worked that way for several years now ...  so the issue seems to be
   changes in menuconfig/kconfig/etc semantics.

   The issue is that when USB_GADGET=m, it's no longer possible to
   configure peripheral controller drivers as modules ...  the
   controller drivers can now only be configured for static linkage.

   It should be making a choice of one of the controller drivers which
   could work on the target system, and allow that driver to be linked
   either as a module (ok iff USB_GADGET=m) or statically."

Reverting this commit resolves the problem, and also fixes a second
problem that David noticed: various dependent options couldn't be enabled.
Tested-and-reported-by: David Brownell <david-b@pacbell.net>
Cc: Randy Dunlap <rdunlap@xenotime.net>
Cc: Jan Beulich <jbeulich@novell.com>,
Cc: Andrew Morton <akpm@linux-foundation.org>,
Cc: Sam Ravnborg <sam@ravnborg.org>,
Cc: Roman Zippel <zippel@linux-m68k.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

scripts/kconfig/menu.c

@@ -235,23 +235,16 @@ void menu_finalize(struct menu *parent)
 	sym = parent->sym;
 	if (parent->list) {
 		if (sym && sym_is_choice(sym)) {
-			/* find out choice type */
-			enum symbol_type type = S_UNKNOWN;
-
+			/* find the first choice value and find out choice type */
 			for (menu = parent->list; menu; menu = menu->next) {
-				if (menu->sym && menu->sym->type != S_UNKNOWN) {
-					if (type == S_UNKNOWN)
-						type = menu->sym->type;
-					if (type != S_BOOLEAN)
-						break;
-					if (menu->sym->type == S_TRISTATE) {
-						type = S_TRISTATE;
+				if (menu->sym) {
+					current_entry = parent;
+					menu_set_type(menu->sym->type);
+					current_entry = menu;
+					menu_set_type(sym->type);
 					break;
 				}
 			}
-			}
-			current_entry = parent;
-			menu_set_type(type);
 			parentdep = expr_alloc_symbol(sym);
 		} else if (parent->prompt)
 			parentdep = parent->prompt->visible.expr;
@@ -260,16 +253,7 @@ void menu_finalize(struct menu *parent)
 
 		for (menu = parent->list; menu; menu = menu->next) {
 			basedep = expr_transform(menu->dep);
-			dep = parentdep;
-			if (sym && sym_is_choice(sym) && menu->sym) {
-				enum symbol_type type = menu->sym->type;
-
-				if (type == S_UNKNOWN)
-					type = sym->type;
-			     if (type != S_TRISTATE)
-					dep = expr_alloc_comp(E_EQUAL, sym, &symbol_yes);
-			}
-			basedep = expr_alloc_and(expr_copy(dep), basedep);
+			basedep = expr_alloc_and(expr_copy(parentdep), basedep);
 			basedep = expr_eliminate_dups(basedep);
 			menu->dep = basedep;
 			if (menu->sym)
@@ -342,7 +326,6 @@ void menu_finalize(struct menu *parent)
 					    "values not supported");
 			}
 			current_entry = menu;
-			if (menu->sym->type == S_UNKNOWN)
 			menu_set_type(sym->type);
 			menu_add_symbol(P_CHOICE, sym, NULL);
 			prop = sym_get_choice_prop(sym);