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-rw-r--r--payloads/libpayload/drivers/usb/xhci.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/payloads/libpayload/drivers/usb/xhci.c b/payloads/libpayload/drivers/usb/xhci.c
index 07d5b16486..749ff0a066 100644
--- a/payloads/libpayload/drivers/usb/xhci.c
+++ b/payloads/libpayload/drivers/usb/xhci.c
@@ -129,7 +129,12 @@ xhci_switchback_ppt_ports(pcidev_t addr)
static long
xhci_handshake(volatile u32 *const reg, u32 mask, u32 wait_for, long timeout_us)
{
- while ((*reg & mask) != wait_for && timeout_us--) udelay(1);
+ if (timeout_us <= 0)
+ return 0;
+ while ((*reg & mask) != wait_for && timeout_us != 0) {
+ --timeout_us;
+ udelay(1);
+ }
return timeout_us;
}