diff --git a/drivers/scsi/stex.c b/drivers/scsi/stex.c
index 96dcbac..81dd3b7 100644
--- a/drivers/scsi/stex.c
+++ b/drivers/scsi/stex.c
@@ -1041,7 +1041,12 @@
 	pci_read_config_byte(bus->self, PCI_BRIDGE_CONTROL, &pci_bctl);
 	pci_bctl |= PCI_BRIDGE_CTL_BUS_RESET;
 	pci_write_config_byte(bus->self, PCI_BRIDGE_CONTROL, pci_bctl);
-	msleep(1);
+
+	/*
+	 * 1 ms may be enough for 8-port controllers. But 16-port controllers
+	 * require more time to finish bus reset. Use 100 ms here for safety
+	 */
+	msleep(100);
 	pci_bctl &= ~PCI_BRIDGE_CTL_BUS_RESET;
 	pci_write_config_byte(bus->self, PCI_BRIDGE_CONTROL, pci_bctl);