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-rw-r--r--include/asm-mips/delay.h9
1 files changed, 9 insertions, 0 deletions
diff --git a/include/asm-mips/delay.h b/include/asm-mips/delay.h
index 85435a8..48d00cc 100644
--- a/include/asm-mips/delay.h
+++ b/include/asm-mips/delay.h
@@ -84,4 +84,13 @@ static inline void __udelay(unsigned long usecs, unsigned long lpj)
#define udelay(usecs) __udelay((usecs),__udelay_val)
+/* make sure "usecs *= ..." in udelay do not overflow. */
+#if HZ >= 1000
+#define MAX_UDELAY_MS 1
+#elif HZ <= 200
+#define MAX_UDELAY_MS 5
+#else
+#define MAX_UDELAY_MS (1000 / HZ)
+#endif
+
#endif /* _ASM_DELAY_H */