I took some time to make a light kvm guest and "inject" errors. It seems to
work fine (after solving a deadlock issue :) ).
Mathieu S.
Le 03/05/2014 23:03, Mathieu Souchaud a écrit :
Check return code of every function called by mcheck_init_device().
Signed-off-by: Mathieu Souchaud <[email protected]>
---
arch/x86/kernel/cpu/mcheck/mce.c | 49 +++++++++++++++++++++++++++++++-------
1 file changed, 41 insertions(+), 8 deletions(-)
diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c
index 68317c8..284cfad 100644
--- a/arch/x86/kernel/cpu/mcheck/mce.c
+++ b/arch/x86/kernel/cpu/mcheck/mce.c
@@ -2437,32 +2437,65 @@ static __init int mcheck_init_device(void)
int err;
int i = 0;
- if (!mce_available(&boot_cpu_data))
- return -EIO;
+ if (!mce_available(&boot_cpu_data)) {
+ err = -EIO;
+ goto err_out;
+ }
- zalloc_cpumask_var(&mce_device_initialized, GFP_KERNEL);
+ if (!zalloc_cpumask_var(&mce_device_initialized, GFP_KERNEL)) {
+ err = -ENOMEM;
+ goto err_out;
+ }
mce_init_banks();
err = subsys_system_register(&mce_subsys, NULL);
if (err)
- return err;
+ goto err_out_mem;
cpu_notifier_register_begin();
for_each_online_cpu(i) {
err = mce_device_create(i);
if (err) {
- cpu_notifier_register_done();
- return err;
+ goto err_device_create;
}
}
register_syscore_ops(&mce_syscore_ops);
- __register_hotcpu_notifier(&mce_cpu_notifier);
+ err = __register_hotcpu_notifier(&mce_cpu_notifier);
+ if (err)
+ goto err_reg_hotcpu;
cpu_notifier_register_done();
/* register character device /dev/mcelog */
- misc_register(&mce_chrdev_device);
+ err = misc_register(&mce_chrdev_device);
+ if (err)
+ goto err_register;
+
+ return 0;
+
+
+err_register:
+ cpu_notifier_register_begin();
+ __unregister_hotcpu_notifier(&mce_cpu_notifier);
+
+err_reg_hotcpu:
+ unregister_syscore_ops(&mce_syscore_ops);
+
+err_device_create:
+ /*
+ * mce_device_remove behave properly if mce_device_create was not
+ * called on that device.
+ */
+ for_each_possible_cpu(i)
+ mce_device_remove(i);
+ cpu_notifier_register_done();
+
+err_out_mem:
+ free_cpumask_var(mce_device_initialized);
+
+err_out:
+ pr_err("Unable to init device /dev/mcelog (rc: %d)\n", err);
return err;
}
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