riscv64/uart/sifive: If we get an invalid clock, skip setting baud

* Prevents us breaking a potentially working serial uart. Change-Id: I57bed42cfa571d3d961ee07f380c96b62c7f34d6 Reviewed-on: https://review.haiku-os.org/c/haiku/+/8798 Reviewed-by: waddlesplash <[email protected]>
2025-01-09 02:50:32 +00:00
parent 1a6cfd7849
commit bba724134f
1 changed files with 7 additions and 1 deletions
@@ -37,7 +37,13 @@ ArchUARTSifive::Init()
 void
 ArchUARTSifive::InitPort(uint32 baud)
 {
-	uint64 quotient = (Clock() + baud - 1) / baud;
+	int64 clock = Clock();
+
+	// if we get an invalid clock for some reason, just accept the currently set baud.
+	if (clock < 0)
+		return;
+
+	uint64 quotient = (clock + baud - 1) / baud;

 	if (quotient == 0)
 		Regs()->div = 0;