1 files changed, 5 insertions, 4 deletions

diff --git a/drivers/serial/mux.c b/drivers/serial/mux.c
index f5b17f5333fb..ea9cbda77965 100644
--- a/drivers/serial/mux.c
+++ b/drivers/serial/mux.c
@@ -83,19 +83,20 @@ static struct timer_list mux_timer;
  */
 static int __init get_mux_port_count(struct parisc_device *dev)
 {
+        int status;
         u8 iodc_data[32];
         unsigned long bytecnt;
 
-        int status = pdc_iodc_read(&bytecnt, dev->hpa.start, 0, iodc_data, 32);
-        BUG_ON(status != PDC_OK);
-
         /* If this is the built-in Mux for the K-Class (Eole CAP/MUX),
          * we only need to allocate resources for 1 port since the
          * other 7 ports are not connected.
          */
-        if(((iodc_data[0] << 4) | ((iodc_data[1] & 0xf0) >> 4)) == 0x15)
+        if(dev->id.hversion == 0x15)
                 return 1;
 
+        status = pdc_iodc_read(&bytecnt, dev->hpa.start, 0, iodc_data, 32);
+        BUG_ON(status != PDC_OK);
+
         /* Return the number of ports specified in the iodc data. */
         return ((((iodc_data)[4] & 0xf0) >> 4) * 8) + 8;
 }