summaryrefslogtreecommitdiff
path: root/arch/mips/kernel/csrc-ioasic.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/mips/kernel/csrc-ioasic.c')
-rw-r--r--arch/mips/kernel/csrc-ioasic.c8
1 files changed, 7 insertions, 1 deletions
diff --git a/arch/mips/kernel/csrc-ioasic.c b/arch/mips/kernel/csrc-ioasic.c
index 87e88feb4a25..6cbbf6e106b9 100644
--- a/arch/mips/kernel/csrc-ioasic.c
+++ b/arch/mips/kernel/csrc-ioasic.c
@@ -37,7 +37,7 @@ static struct clocksource clocksource_dec = {
.flags = CLOCK_SOURCE_IS_CONTINUOUS,
};
-void __init dec_ioasic_clocksource_init(void)
+int __init dec_ioasic_clocksource_init(void)
{
unsigned int freq;
u32 start, end;
@@ -56,8 +56,14 @@ void __init dec_ioasic_clocksource_init(void)
end = dec_ioasic_hpt_read(&clocksource_dec);
freq = (end - start) * 8;
+
+ /* An early revision of the I/O ASIC didn't have the counter. */
+ if (!freq)
+ return -ENXIO;
+
printk(KERN_INFO "I/O ASIC clock frequency %dHz\n", freq);
clocksource_dec.rating = 200 + freq / 10000000;
clocksource_register_hz(&clocksource_dec, freq);
+ return 0;
}