module_kallsyms_lookup_name() has several exit conditions but
can't return immediately due to preempt_disable().
Refactor module_kallsyms_lookup_name() to allow returning from
anywhere, and reduce depth.
Signed-off-by: Christophe Leroy <christophe.leroy@xxxxxxxxxx>
---
kernel/module/kallsyms.c | 38 ++++++++++++++++++++++++--------------
1 file changed, 24 insertions(+), 14 deletions(-)
diff --git a/kernel/module/kallsyms.c b/kernel/module/kallsyms.c
index fe3636bde605..df0150c467d4 100644
--- a/kernel/module/kallsyms.c
+++ b/kernel/module/kallsyms.c
@@ -448,29 +448,39 @@ unsigned long find_kallsyms_symbol_value(struct module *mod, const char *name)
return 0;
}
-/* Look for this name: can be of form module:name. */
-unsigned long module_kallsyms_lookup_name(const char *name)
+static unsigned long __module_kallsyms_lookup_name(const char *name)
{
struct module *mod;
char *colon;
- unsigned long ret = 0;
- /* Don't lock: we're in enough trouble already. */
- preempt_disable();
colon = strnchr(name, MODULE_NAME_LEN, ':');
if (colon) {
mod = find_module_all(name, colon - name, false);
if (mod)
- ret = find_kallsyms_symbol_value(mod, colon + 1);
- } else {
- list_for_each_entry_rcu(mod, &modules, list) {
- if (mod->state == MODULE_STATE_UNFORMED)
- continue;
- ret = find_kallsyms_symbol_value(mod, name);
- if (ret)
- break;
- }
+ return find_kallsyms_symbol_value(mod, colon + 1);
+ return 0;
}
+
+ list_for_each_entry_rcu(mod, &modules, list) {
+ unsigned long ret;
+
+ if (mod->state == MODULE_STATE_UNFORMED)
+ continue;
+ ret = find_kallsyms_symbol_value(mod, name);
+ if (ret)
+ return ret;
+ }
+ return 0;
+}
+
+/* Look for this name: can be of form module:name. */
+unsigned long module_kallsyms_lookup_name(const char *name)
+{
+ unsigned long ret;
+
+ /* Don't lock: we're in enough trouble already. */
+ preempt_disable();
+ ret = __module_kallsyms_lookup_name(name);
preempt_enable();
return ret;
}
--
2.35.3
