x86/mce: Make timer handling more robust

Erik reported that on a preproduction hardware a CMCI storm triggers the
BUG_ON in add_timer_on(). The reason is that the per CPU MCE timer is
started by the CMCI logic before the MCE CPU hotplug callback starts the
timer with add_timer_on(). So the timer is already queued which triggers
the BUG.

Using add_timer_on() is pretty pointless in this code because the timer is
strictlty per CPU, initialized as pinned and all operations which arm the
timer happen on the CPU to which the timer belongs.

Simplify the whole machinery by using mod_timer() instead of add_timer_on()
which avoids the problem because mod_timer() can handle already queued
timers. Use __start_timer() everywhere so the earliest armed expiry time is
preserved.

Reported-by: Erik Veijola <erik.veijola@intel.com>
Tested-by: Borislav Petkov <bp@alien8.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Borislav Petkov <bp@alien8.de>
Cc: Tony Luck <tony.luck@intel.com>
Link: http://lkml.kernel.org/r/alpine.DEB.2.20.1701310936080.3457@nanos
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

path: root/sound/pci/ctxfi/cttimer.h

/*
 * Timer handling
 */

#ifndef __CTTIMER_H
#define __CTTIMER_H

#include <linux/spinlock.h>
#include <linux/timer.h>
#include <linux/list.h>

struct snd_pcm_substream;
struct ct_atc;
struct ct_atc_pcm;

struct ct_timer;
struct ct_timer_instance;

struct ct_timer *ct_timer_new(struct ct_atc *atc);
void ct_timer_free(struct ct_timer *atimer);

struct ct_timer_instance *
ct_timer_instance_new(struct ct_timer *atimer, struct ct_atc_pcm *apcm);
void ct_timer_instance_free(struct ct_timer_instance *ti);
void ct_timer_start(struct ct_timer_instance *ti);
void ct_timer_stop(struct ct_timer_instance *ti);
void ct_timer_prepare(struct ct_timer_instance *ti);

#endif /* __CTTIMER_H */