1 files changed, 22 insertions, 1 deletions

diff --git a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c
index e077d2508727..6af310195bae 100644
--- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c
+++ b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c
@@ -9122,13 +9122,34 @@ static int __devinit bnx2x_prev_unload_common(struct bnx2x *bp)
         return bnx2x_prev_mcp_done(bp);
 }
 
+/* previous driver DMAE transaction may have occurred when pre-boot stage ended
+ * and boot began, or when kdump kernel was loaded. Either case would invalidate
+ * the addresses of the transaction, resulting in was-error bit set in the pci
+ * causing all hw-to-host pcie transactions to timeout. If this happened we want
+ * to clear the interrupt which detected this from the pglueb and the was done
+ * bit
+ */
+static void __devinit bnx2x_prev_interrupted_dmae(struct bnx2x *bp)
+{
+        u32 val = REG_RD(bp, PGLUE_B_REG_PGLUE_B_INT_STS);
+        if (val & PGLUE_B_PGLUE_B_INT_STS_REG_WAS_ERROR_ATTN) {
+                BNX2X_ERR("was error bit was found to be set in pglueb upon startup. Clearing");
+                REG_WR(bp, PGLUE_B_REG_WAS_ERROR_PF_7_0_CLR, 1 << BP_FUNC(bp));
+        }
+}
+
 static int __devinit bnx2x_prev_unload(struct bnx2x *bp)
 {
         int time_counter = 10;
         u32 rc, fw, hw_lock_reg, hw_lock_val;
         BNX2X_DEV_INFO("Entering Previous Unload Flow\n");
 
-       /* Release previously held locks */
+        /* clear hw from errors which may have resulted from an interrupted
+         * dmae transaction.
+         */
+        bnx2x_prev_interrupted_dmae(bp);
+
+        /* Release previously held locks */
         hw_lock_reg = (BP_FUNC(bp) <= 5) ?
                       (MISC_REG_DRIVER_CONTROL_1 + BP_FUNC(bp) * 8) :
                       (MISC_REG_DRIVER_CONTROL_7 + (BP_FUNC(bp) - 6) * 8);