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authorJessica Yu <jeyu@redhat.com>2016-03-16 20:55:38 -0400
committerJiri Kosina <jkosina@suse.cz>2016-03-17 09:45:09 +0100
commit4c973d1620ae08f5cbe27644c5f5b974c8f594ec (patch)
tree7c7be4f090f2da5084774aab39475e89234f9e4c /kernel/module.c
parent06e1c170c332dca755f389a99671912ff405698c (diff)
downloadlinux-4c973d1620ae08f5cbe27644c5f5b974c8f594ec.tar.bz2
modules: split part of complete_formation() into prepare_coming_module()
Put all actions in complete_formation() that are performed after module->state is set to MODULE_STATE_COMING into a separate function prepare_coming_module(). This split prepares for the removal of the livepatch module notifiers in favor of hard-coding function calls to klp_module_{coming,going} in the module loader. The complete_formation -> prepare_coming_module split will also make error handling easier since we can jump to the appropriate error label to do any module GOING cleanup after all the COMING-actions have completed. Signed-off-by: Jessica Yu <jeyu@redhat.com> Reviewed-by: Josh Poimboeuf <jpoimboe@redhat.com> Reviewed-by: Petr Mladek <pmladek@suse.cz> Acked-by: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Diffstat (limited to 'kernel/module.c')
-rw-r--r--kernel/module.c26
1 files changed, 18 insertions, 8 deletions
diff --git a/kernel/module.c b/kernel/module.c
index 794ebe8e878d..6dbfad415d51 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -3392,9 +3392,6 @@ static int complete_formation(struct module *mod, struct load_info *info)
mod->state = MODULE_STATE_COMING;
mutex_unlock(&module_mutex);
- ftrace_module_enable(mod);
- blocking_notifier_call_chain(&module_notify_list,
- MODULE_STATE_COMING, mod);
return 0;
out:
@@ -3402,6 +3399,14 @@ out:
return err;
}
+static int prepare_coming_module(struct module *mod)
+{
+ ftrace_module_enable(mod);
+ blocking_notifier_call_chain(&module_notify_list,
+ MODULE_STATE_COMING, mod);
+ return 0;
+}
+
static int unknown_module_param_cb(char *param, char *val, const char *modname,
void *arg)
{
@@ -3516,13 +3521,17 @@ static int load_module(struct load_info *info, const char __user *uargs,
if (err)
goto ddebug_cleanup;
+ err = prepare_coming_module(mod);
+ if (err)
+ goto bug_cleanup;
+
/* Module is ready to execute: parsing args may do that. */
after_dashes = parse_args(mod->name, mod->args, mod->kp, mod->num_kp,
-32768, 32767, mod,
unknown_module_param_cb);
if (IS_ERR(after_dashes)) {
err = PTR_ERR(after_dashes);
- goto bug_cleanup;
+ goto coming_cleanup;
} else if (after_dashes) {
pr_warn("%s: parameters '%s' after `--' ignored\n",
mod->name, after_dashes);
@@ -3531,7 +3540,7 @@ static int load_module(struct load_info *info, const char __user *uargs,
/* Link in to syfs. */
err = mod_sysfs_setup(mod, info, mod->kp, mod->num_kp);
if (err < 0)
- goto bug_cleanup;
+ goto coming_cleanup;
/* Get rid of temporary copy. */
free_copy(info);
@@ -3541,15 +3550,16 @@ static int load_module(struct load_info *info, const char __user *uargs,
return do_init_module(mod);
+ coming_cleanup:
+ blocking_notifier_call_chain(&module_notify_list,
+ MODULE_STATE_GOING, mod);
+
bug_cleanup:
/* module_bug_cleanup needs module_mutex protection */
mutex_lock(&module_mutex);
module_bug_cleanup(mod);
mutex_unlock(&module_mutex);
- blocking_notifier_call_chain(&module_notify_list,
- MODULE_STATE_GOING, mod);
-
/* we can't deallocate the module until we clear memory protection */
module_disable_ro(mod);
module_disable_nx(mod);