Patch "r8152: avoid start_xmit to call napi_schedule during autosuspend" has been added to the 4.9-stable tree

Patch "r8152: avoid start_xmit to call napi_schedule during autosuspend" has been added to the 4.9-stable tree

[gregkh]

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

    r8152: avoid start_xmit to call napi_schedule during autosuspend

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:
     r8152-avoid-start_xmit-to-call-napi_schedule-during-autosuspend.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 15:00:53 CEST 2017
From: hayeswang <hayeswang@realtek.com>
Date: Thu, 26 Jan 2017 09:38:31 +0800
Subject: r8152: avoid start_xmit to call napi_schedule during autosuspend

From: hayeswang <hayeswang@realtek.com>


[ Upstream commit 26afec39306926654e9cd320f19bbf3685bb0997 ]

Adjust the setting of the flag of SELECTIVE_SUSPEND to prevent start_xmit()
from calling napi_schedule() directly during runtime suspend.

After calling napi_disable() or clearing the flag of WORK_ENABLE,
scheduling the napi is useless.

Signed-off-by: Hayes Wang <hayeswang@realtek.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/usb/r8152.c |   12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

--- a/drivers/net/usb/r8152.c
+++ b/drivers/net/usb/r8152.c
@@ -3583,10 +3583,15 @@ static int rtl8152_rumtime_suspend(struc
 	struct net_device *netdev = tp->netdev;
 	int ret = 0;
 
+	set_bit(SELECTIVE_SUSPEND, &tp->flags);
+	smp_mb__after_atomic();
+
 	if (netif_running(netdev) && test_bit(WORK_ENABLE, &tp->flags)) {
 		u32 rcr = 0;
 
 		if (delay_autosuspend(tp)) {
+			clear_bit(SELECTIVE_SUSPEND, &tp->flags);
+			smp_mb__after_atomic();
 			ret = -EBUSY;
 			goto out1;
 		}
@@ -3603,6 +3608,8 @@ static int rtl8152_rumtime_suspend(struc
 			if (!(ocp_data & RXFIFO_EMPTY)) {
 				rxdy_gated_en(tp, false);
 				ocp_write_dword(tp, MCU_TYPE_PLA, PLA_RCR, rcr);
+				clear_bit(SELECTIVE_SUSPEND, &tp->flags);
+				smp_mb__after_atomic();
 				ret = -EBUSY;
 				goto out1;
 			}
@@ -3622,8 +3629,6 @@ static int rtl8152_rumtime_suspend(struc
 		}
 	}
 
-	set_bit(SELECTIVE_SUSPEND, &tp->flags);
-
 out1:
 	return ret;
 }
@@ -3679,12 +3684,13 @@ static int rtl8152_resume(struct usb_int
 	if (netif_running(tp->netdev) && tp->netdev->flags & IFF_UP) {
 		if (test_bit(SELECTIVE_SUSPEND, &tp->flags)) {
 			tp->rtl_ops.autosuspend_en(tp, false);
-			clear_bit(SELECTIVE_SUSPEND, &tp->flags);
 			napi_disable(&tp->napi);
 			set_bit(WORK_ENABLE, &tp->flags);
 			if (netif_carrier_ok(tp->netdev))
 				rtl_start_rx(tp);
 			napi_enable(&tp->napi);
+			clear_bit(SELECTIVE_SUSPEND, &tp->flags);
+			smp_mb__after_atomic();
 		} else {
 			tp->rtl_ops.up(tp);
 			netif_carrier_off(tp->netdev);


Patches currently in stable-queue which might be from hayeswang@realtek.com are

queue-4.9/r8152-fix-rtl8152_post_reset-function.patch
queue-4.9/r8152-re-schedule-napi-for-tx.patch
queue-4.9/r8152-avoid-start_xmit-to-call-napi_schedule-during-autosuspend.patch
queue-4.9/r8152-check-rx-after-napi-is-enabled.patch