dynamic debug: move ddebug_remove_module() down into free_module()
Jason Baron [Tue, 27 Jul 2010 20:18:01 +0000 (13:18 -0700)]
The command

echo "file ec.c +p" >/sys/kernel/debug/dynamic_debug/control

causes an oops.

Move the call to ddebug_remove_module() down into free_module().  In this
way it should be called from all error paths.  Currently, we are missing
the remove if the module init routine fails.

Signed-off-by: Jason Baron <jbaron@redhat.com>
Reported-by: Thomas Renninger <trenn@suse.de>
Tested-by: Thomas Renninger <trenn@suse.de>
Cc: <stable@kernel.org> [2.6.32+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

kernel/module.c

index 5d2d281..6c56282 100644 (file)
@@ -787,7 +787,6 @@ SYSCALL_DEFINE2(delete_module, const char __user *, name_user,
 
        /* Store the name of the last unloaded module for diagnostic purposes */
        strlcpy(last_unloaded_module, mod->name, sizeof(last_unloaded_module));
-       ddebug_remove_module(mod->name);
 
        free_module(mod);
        return 0;
@@ -1550,6 +1549,9 @@ static void free_module(struct module *mod)
        remove_sect_attrs(mod);
        mod_kobject_remove(mod);
 
+       /* Remove dynamic debug info */
+       ddebug_remove_module(mod->name);
+
        /* Arch-specific cleanup. */
        module_arch_cleanup(mod);