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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: Rui Miguel Silva <rmfrfs@gmail.com>
Signed-off-by: Bryan O'Donoghue <pure.logic@nexus-software.ie>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Bryan O'Donoghue 2016-09-26 18:01:23 +01:00 committed by Greg Kroah-Hartman
parent 3d7f358855
commit 659849cdc0
1 changed files with 7 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
drivers/staging/greybus/timesync_platform.c
View File

@ -20,6 +20,8 @@
#include "greybus.h"
#include "arche_platform.h"
#define DEFAULT_FRAMETIME_CLOCK_HZ 19200000
static u32 gb_timesync_clock_frequency;
int (*arche_platform_change_state_cb)(enum arche_platform_state state,
struct gb_timesync_svc *pdata);
@ -32,8 +34,11 @@ u64 gb_timesync_platform_get_counter(void)
u32 gb_timesync_platform_get_clock_rate(void)
{
if (unlikely(!gb_timesync_clock_frequency))
return cpufreq_get(0);
if (unlikely(!gb_timesync_clock_frequency)) {
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;
}