x86/mce/AMD: Make the init code more robust

If mce_device_init() fails then the mce device pointer is NULL and the
AMD mce code happily dereferences it.

Add a sanity check.

Reported-by: Markus Trippelsdorf <markus@trippelsdorf.de>
Reported-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

path: root/irq.h

#ifndef IRQ_H
#define IRQ_H

extern int device_irq_number(const char *ifname);
extern void device_restore_irq_affinity_list(void);
extern int device_set_irq_affinity_list(int irq, unsigned long from,
					unsigned long to);
extern int device_set_irq_affinity(int irq, unsigned long cpu);

#endif /* IRQ_H */