diff --git a/drivers/infiniband/hw/qib/qib_init.c b/drivers/infiniband/hw/qib/qib_init.c
index cf0cd30adc8d07667956eb1244cd2b06f9e00cf1..dc14e100a7f1a560a86ea82ab38929eadccd3cc4 100644
--- a/drivers/infiniband/hw/qib/qib_init.c
+++ b/drivers/infiniband/hw/qib/qib_init.c
@@ -102,6 +102,8 @@ void qib_set_ctxtcnt(struct qib_devdata *dd)
 		dd->cfgctxts = qib_cfgctxts;
 	else
 		dd->cfgctxts = dd->ctxtcnt;
+	dd->freectxts = (dd->first_user_ctxt > dd->cfgctxts) ? 0 :
+		dd->cfgctxts - dd->first_user_ctxt;
 }
 
 /*
@@ -402,7 +404,6 @@ static void enable_chip(struct qib_devdata *dd)
 		if (rcd)
 			dd->f_rcvctrl(rcd->ppd, rcvmask, i);
 	}
-	dd->freectxts = dd->cfgctxts - dd->first_user_ctxt;
 }
 
 static void verify_interrupt(unsigned long opaque)
diff --git a/drivers/infiniband/hw/qib/qib_sysfs.c b/drivers/infiniband/hw/qib/qib_sysfs.c
index dae51604cfcd24f287790467892d9960884905e0..dd9cd49d097927bf8816c5aedc836c3f31e4b5ea 100644
--- a/drivers/infiniband/hw/qib/qib_sysfs.c
+++ b/drivers/infiniband/hw/qib/qib_sysfs.c
@@ -503,8 +503,11 @@ static ssize_t show_nctxts(struct device *device,
 	struct qib_devdata *dd = dd_from_dev(dev);
 
 	/* Return the number of user ports (contexts) available. */
-	return scnprintf(buf, PAGE_SIZE, "%u\n", dd->cfgctxts -
-		dd->first_user_ctxt);
+	/* The calculation below deals with a special case where
+	 * cfgctxts is set to 1 on a single-port board. */
+	return scnprintf(buf, PAGE_SIZE, "%u\n",
+			(dd->first_user_ctxt > dd->cfgctxts) ? 0 :
+			(dd->cfgctxts - dd->first_user_ctxt));
 }
 
 static ssize_t show_nfreectxts(struct device *device,