Commit 659849cd authored by Bryan O'Donoghue's avatar Bryan O'Donoghue Committed by Greg Kroah-Hartman
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staging: greybus/timesync: avoid divide by zero on X86 Qemu 



A system configured without CONFIG_CPUFREQ will return 0 for cpufreq_get().
greybus-timesync can subsequently then do a divide-by-zero as result. This
patch fixes by checking for a zero return value from cpufreq_get() and
setting to a default value of 19.2MHz.

Reported-by: default avatarRui Miguel Silva <rmfrfs@gmail.com>
Signed-off-by: default avatarBryan O'Donoghue <pure.logic@nexus-software.ie>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 3d7f3588

drivers/staging/greybus/timesync_platform.c

+7 −2
Original line number Original line Diff line number Diff line
@@ -20,6 +20,8 @@ 
#include "greybus.h"

#include "greybus.h"

#include "arche_platform.h"

#include "arche_platform.h"





#define DEFAULT_FRAMETIME_CLOCK_HZ 19200000



static u32 gb_timesync_clock_frequency;

static u32 gb_timesync_clock_frequency;

int (*arche_platform_change_state_cb)(enum arche_platform_state state,

int (*arche_platform_change_state_cb)(enum arche_platform_state state,

				      struct gb_timesync_svc *pdata);

				      struct gb_timesync_svc *pdata);
@@ -32,8 +34,11 @@ u64 gb_timesync_platform_get_counter(void) 




u32 gb_timesync_platform_get_clock_rate(void)

u32 gb_timesync_platform_get_clock_rate(void)

{

{

	if (unlikely(!gb_timesync_clock_frequency))

	if (unlikely(!gb_timesync_clock_frequency)) {

		return cpufreq_get(0);

		gb_timesync_clock_frequency = cpufreq_get(0);

		if (!gb_timesync_clock_frequency)

			gb_timesync_clock_frequency = DEFAULT_FRAMETIME_CLOCK_HZ;

	}





	return gb_timesync_clock_frequency;

	return gb_timesync_clock_frequency;

}

}