Patch "bnxt_en: Fix RTNL lock usage on bnxt_get_port_module_status()." has been added to the 4.9-stable tree

[<gregkh@linuxfoundation.org>]

This is a note to let you know that I've just added the patch titled

    bnxt_en: Fix RTNL lock usage on bnxt_get_port_module_status().

to the 4.9-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     bnxt_en-fix-rtnl-lock-usage-on-bnxt_get_port_module_status.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From foo@baz Thu Jun 15 16:23:30 CEST 2017
From: Michael Chan <michael.chan@broadcom.com>
Date: Wed, 25 Jan 2017 02:55:09 -0500
Subject: bnxt_en: Fix RTNL lock usage on bnxt_get_port_module_status().

From: Michael Chan <michael.chan@broadcom.com>


[ Upstream commit 90c694bb71819fb5bd3501ac397307d7e41ddeca ]

bnxt_get_port_module_status() calls bnxt_update_link() which expects
RTNL to be held.  In bnxt_sp_task() that does not hold RTNL, we need to
call it with a prior call to bnxt_rtnl_lock_sp() and the call needs to
be moved to the end of bnxt_sp_task().

Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/net/ethernet/broadcom/bnxt/bnxt.c |    9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
@@ -6158,9 +6158,6 @@ static void bnxt_sp_task(struct work_str
 		bnxt_hwrm_tunnel_dst_port_free(
 			bp, TUNNEL_DST_PORT_FREE_REQ_TUNNEL_TYPE_GENEVE);
 	}
-	if (test_and_clear_bit(BNXT_HWRM_PORT_MODULE_SP_EVENT, &bp->sp_event))
-		bnxt_get_port_module_status(bp);
-
 	if (test_and_clear_bit(BNXT_PERIODIC_STATS_SP_EVENT, &bp->sp_event))
 		bnxt_hwrm_port_qstats(bp);
 
@@ -6182,6 +6179,12 @@ static void bnxt_sp_task(struct work_str
 			netdev_err(bp->dev, "SP task can't update link (rc: %x)\n",
 				   rc);
 	}
+	if (test_and_clear_bit(BNXT_HWRM_PORT_MODULE_SP_EVENT, &bp->sp_event)) {
+		bnxt_rtnl_lock_sp(bp);
+		if (test_bit(BNXT_STATE_OPEN, &bp->state))
+			bnxt_get_port_module_status(bp);
+		bnxt_rtnl_unlock_sp(bp);
+	}
 	if (test_and_clear_bit(BNXT_RESET_TASK_SP_EVENT, &bp->sp_event))
 		bnxt_reset(bp, false);
 


Patches currently in stable-queue which might be from michael.chan@broadcom.com are

queue-4.9/bnxt_en-fix-bnxt_reset-in-the-slow-path-task.patch
queue-4.9/bnxt_en-enhance-autoneg-support.patch
queue-4.9/bnxt_en-fix-rtnl-lock-usage-on-bnxt_update_link.patch
queue-4.9/bnxt_en-fix-rtnl-lock-usage-on-bnxt_get_port_module_status.patch