module: allow multiple calls to MODULE_DEVICE_TABLE() per module

Commit 78551277e4df5: "Input: i8042 - add PNP modaliases" had a bug, where the
second call to MODULE_DEVICE_TABLE() overrode the first resulting in not all
the modaliases being exposed.

This fixes the problem by including the name of the device_id table in the
__mod_*_device_table alias, allowing us to export several device_id tables
per module.

Suggested-by: Kay Sievers <kay@vrfy.org>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Tom Gundersen <teg@jklm.no>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

diff --git a/include/linux/module.h b/include/linux/module.h
index eaf60ff..ad18f60 100644 (file)
--- a/include/linux/module.h
+++ b/include/linux/module.h
@@ -142,7 +142,7 @@ extern const struct gtype##_id __mod_##gtype##_table                \
 #define MODULE_DESCRIPTION(_description) MODULE_INFO(description, _description)
 
 #define MODULE_DEVICE_TABLE(type, name)                \
-  MODULE_GENERIC_TABLE(type##_device, name)
+  MODULE_GENERIC_TABLE(type##__##name##_device, name)
 
 /* Version of form [<epoch>:]<version>[-<extra-version>].
  * Or for CVS/RCS ID version, everything but the number is stripped.

diff --git a/scripts/mod/file2alias.c b/scripts/mod/file2alias.c
index 25e5cb0..ce16404 100644 (file)
--- a/scripts/mod/file2alias.c
+++ b/scripts/mod/file2alias.c
@@ -42,7 +42,7 @@ typedef unsigned char __u8;
 
 /* This array collects all instances that use the generic do_table */
 struct devtable {
-       const char *device_id; /* name of table, __mod_<name>_device_table. */
+       const char *device_id; /* name of table, __mod_<name>__*_device_table. */
        unsigned long id_size;
        void *function;
 };
@@ -146,7 +146,8 @@ static void device_id_check(const char *modname, const char *device_id,
 
        if (size % id_size || size < id_size) {
                fatal("%s: sizeof(struct %s_device_id)=%lu is not a modulo "
-                     "of the size of section __mod_%s_device_table=%lu.\n"
+                     "of the size of "
+                     "section __mod_%s__<identifier>_device_table=%lu.\n"
                      "Fix definition of struct %s_device_id "
                      "in mod_devicetable.h\n",
                      modname, device_id, id_size, device_id, size, device_id);
@@ -1206,7 +1207,7 @@ void handle_moddevtable(struct module *mod, struct elf_info *info,
 {
        void *symval;
        char *zeros = NULL;
-       const char *name;
+       const char *name, *identifier;
        unsigned int namelen;
 
        /* We're looking for a section relative symbol */
@@ -1217,7 +1218,7 @@ void handle_moddevtable(struct module *mod, struct elf_info *info,
        if (ELF_ST_TYPE(sym->st_info) != STT_OBJECT)
                return;
 
-       /* All our symbols are of form <prefix>__mod_XXX_device_table. */
+       /* All our symbols are of form <prefix>__mod_<name>__<identifier>_device_table. */
        name = strstr(symname, "__mod_");
        if (!name)
                return;
@@ -1227,7 +1228,10 @@ void handle_moddevtable(struct module *mod, struct elf_info *info,
                return;
        if (strcmp(name + namelen - strlen("_device_table"), "_device_table"))
                return;
-       namelen -= strlen("_device_table");
+       identifier = strstr(name, "__");
+       if (!identifier)
+               return;
+       namelen = identifier - name;
 
        /* Handle all-NULL symbols allocated into .bss */
        if (info->sechdrs[get_secindex(info, sym)].sh_type & SHT_NOBITS) {