summaryrefslogtreecommitdiffstats
path: root/drivers/infiniband/hw/qib/qib_sysfs.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/infiniband/hw/qib/qib_sysfs.c')
-rw-r--r--drivers/infiniband/hw/qib/qib_sysfs.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/drivers/infiniband/hw/qib/qib_sysfs.c b/drivers/infiniband/hw/qib/qib_sysfs.c
index dae51604cfcd..dd9cd49d0979 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,