cxgb4: Mask out interrupts that are not enabled.

There are rare cases where a PL_INT_CAUSE bit may end up getting
set when the corresponding PL_INT_ENABLE bit isn't set.

Signed-off-by: Vishal Kulkarni <vishal@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/chelsio/cxgb4/t4_hw.c b/drivers/net/ethernet/chelsio/cxgb4/t4_hw.c
index 27af347..49e4374 100644 (file)
--- a/drivers/net/ethernet/chelsio/cxgb4/t4_hw.c
+++ b/drivers/net/ethernet/chelsio/cxgb4/t4_hw.c
@@ -4962,7 +4962,13 @@ static void pl_intr_handler(struct adapter *adap)
  */
 int t4_slow_intr_handler(struct adapter *adapter)
 {
-       u32 cause = t4_read_reg(adapter, PL_INT_CAUSE_A);
+       /* There are rare cases where a PL_INT_CAUSE bit may end up getting
+        * set when the corresponding PL_INT_ENABLE bit isn't set.  It's
+        * easiest just to mask that case here.
+        */
+       u32 raw_cause = t4_read_reg(adapter, PL_INT_CAUSE_A);
+       u32 enable = t4_read_reg(adapter, PL_INT_ENABLE_A);
+       u32 cause = raw_cause & enable;
 
        if (!(cause & GLBL_INTR_MASK))
                return 0;
@@ -5014,7 +5020,7 @@ int t4_slow_intr_handler(struct adapter *adapter)
                ulptx_intr_handler(adapter);
 
        /* Clear the interrupts just processed for which we are the master. */
-       t4_write_reg(adapter, PL_INT_CAUSE_A, cause & GLBL_INTR_MASK);
+       t4_write_reg(adapter, PL_INT_CAUSE_A, raw_cause & GLBL_INTR_MASK);
        (void)t4_read_reg(adapter, PL_INT_CAUSE_A); /* flush */
        return 1;
 }