From: Michael Chan <mchan@broadcom.com>
Date: Thu, 10 Dec 2015 00:35:44 +0000 (-0500)
Subject: bnxt_en: Implement missing tx timeout reset logic.
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=028de140ffdf481d4948de663b33dae78e1e9cc8;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git

bnxt_en: Implement missing tx timeout reset logic.

The reset logic calls bnxt_close_nic() and bnxt_open_nic() under rtnl_lock
from bnxt_sp_task.  BNXT_STATE_IN_SP_TASK must be cleared before calling
bnxt_close_nic() to avoid deadlock.

v2: Fixed white space error.  Thanks Dave.

Signed-off-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
index f5f448959ee2..07f5f239cb65 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
@@ -5031,8 +5031,10 @@ static void bnxt_dbg_dump_states(struct bnxt *bp)
 static void bnxt_reset_task(struct bnxt *bp)
 {
 	bnxt_dbg_dump_states(bp);
-	if (netif_running(bp->dev))
-		bnxt_tx_disable(bp); /* prevent tx timout again */
+	if (netif_running(bp->dev)) {
+		bnxt_close_nic(bp, false, false);
+		bnxt_open_nic(bp, false, false);
+	}
 }
 
 static void bnxt_tx_timeout(struct net_device *dev)
@@ -5111,8 +5113,16 @@ static void bnxt_sp_task(struct work_struct *work)
 		bnxt_hwrm_tunnel_dst_port_free(
 			bp, TUNNEL_DST_PORT_FREE_REQ_TUNNEL_TYPE_VXLAN);
 	}
-	if (test_and_clear_bit(BNXT_RESET_TASK_SP_EVENT, &bp->sp_event))
+	if (test_and_clear_bit(BNXT_RESET_TASK_SP_EVENT, &bp->sp_event)) {
+		/* bnxt_reset_task() calls bnxt_close_nic() which waits
+		 * for BNXT_STATE_IN_SP_TASK to clear.
+		 */
+		clear_bit(BNXT_STATE_IN_SP_TASK, &bp->state);
+		rtnl_lock();
 		bnxt_reset_task(bp);
+		set_bit(BNXT_STATE_IN_SP_TASK, &bp->state);
+		rtnl_unlock();
+	}
 
 	smp_mb__before_atomic();
 	clear_bit(BNXT_STATE_IN_SP_TASK, &bp->state);