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x86/mce: Improve mcheck_init_device() error handling

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Check return code of every function called by mcheck_init_device().

Signed-off-by: Mathieu Souchaud <mattieu.souchaud@free.fr>
Link: http://lkml.kernel.org/r/1399151031-19905-1-git-send-email-mattieu.souchaud@free.fr
Signed-off-by: Borislav Petkov <bp@suse.de>
This commit is contained in:
Mathieu Souchaud 2014-05-28 09:12:37 +02:00 committed by Borislav Petkov
parent c7208164e6
commit 9c15a24b03
1 changed files with 40 additions and 7 deletions
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47
arch/x86/kernel/cpu/mcheck/mce.c
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@ -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);
cpu_notifier_register_done();
register_syscore_ops(&mce_syscore_ops);
/* 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:
unregister_syscore_ops(&mce_syscore_ops);
cpu_notifier_register_begin();
__unregister_hotcpu_notifier(&mce_cpu_notifier);
cpu_notifier_register_done();
err_device_create:
/*
* We didn't keep track of which devices were created above, but
* even if we had, the set of online cpus might have changed.
* Play safe and remove for every possible cpu, since
* mce_device_remove() will do the right thing.
*/
for_each_possible_cpu(i)
mce_device_remove(i);
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;
}