IB/ipath: Fix check for no interrupts to reliably fallback to INTx

[mv-sheeva.git] / drivers / infiniband / hw / ipath / ipath_init_chip.c

diff --git a/drivers/infiniband/hw/ipath/ipath_init_chip.c b/drivers/infiniband/hw/ipath/ipath_init_chip.c
index 1adafa97e0825f28339baaf121deb3f9ad1f7ea2..0db19c1b45c3e2e638f74e956d1e299b8f8e64aa 100644 (file)
--- a/drivers/infiniband/hw/ipath/ipath_init_chip.c
+++ b/drivers/infiniband/hw/ipath/ipath_init_chip.c
@@ -665,6 +665,28 @@ done:
        return ret;
 }
 
+static void verify_interrupt(unsigned long opaque)
+{
+       struct ipath_devdata *dd = (struct ipath_devdata *) opaque;
+
+       if (!dd)
+               return; /* being torn down */
+
+       /*
+        * If we don't have any interrupts, let the user know and
+        * don't bother checking again.
+        */
+       if (dd->ipath_int_counter == 0) {
+               if (!dd->ipath_f_intr_fallback(dd))
+                       dev_err(&dd->pcidev->dev, "No interrupts detected, "
+                               "not usable.\n");
+               else /* re-arm the timer to see if fallback works */
+                       mod_timer(&dd->ipath_intrchk_timer, jiffies + HZ/2);
+       } else
+               ipath_cdbg(VERBOSE, "%u interrupts at timer check\n",
+                       dd->ipath_int_counter);
+}
+
 /**
  * ipath_init_chip - do the actual initialization sequence on the chip
  * @dd: the infinipath device
@@ -968,6 +990,20 @@ done:
                                         0ULL);
                        /* chip is usable; mark it as initialized */
                        *dd->ipath_statusp |= IPATH_STATUS_INITTED;
+
+                       /*
+                        * setup to verify we get an interrupt, and fallback
+                        * to an alternate if necessary and possible
+                        */
+                       if (!reinit) {
+                               init_timer(&dd->ipath_intrchk_timer);
+                               dd->ipath_intrchk_timer.function =
+                                       verify_interrupt;
+                               dd->ipath_intrchk_timer.data =
+                                       (unsigned long) dd;
+                       }
+                       dd->ipath_intrchk_timer.expires = jiffies + HZ/2;
+                       add_timer(&dd->ipath_intrchk_timer);
                } else
                        ipath_dev_err(dd, "No interrupts enabled, couldn't "
                                      "setup interrupt address\n");