IB/ipath: Test interrupts at driver startup

All too often, interrupts do not get enabled for our card due to BIOS
misconfiguration and other issues.  This patch checks for that
condition on startup and warns the user.  This patch is based on work
(check LID availability) by Robert Walsh.

Signed-off-by: Arthur Jones <arthur.jones@qlogic.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/infiniband/hw/ipath/ipath_intr.c b/drivers/infiniband/hw/ipath/ipath_intr.c
index ce490235c24..47aa43428fb 100644
--- a/drivers/infiniband/hw/ipath/ipath_intr.c
+++ b/drivers/infiniband/hw/ipath/ipath_intr.c
@@ -1009,6 +1009,9 @@ irqreturn_t ipath_intr(int irq, void *data)
 
         ipath_stats.sps_ints++;
 
+        if (dd->ipath_int_counter != (u32) -1)
+                dd->ipath_int_counter++;
+
         if (!(dd->ipath_flags & IPATH_PRESENT)) {
                 /*
                  * This return value is not great, but we do not want the