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@xxxxxxxxxxxxxxx> know about it.
>From foo@baz Thu Jun 15 15:00:53 CEST 2017
From: hayeswang <hayeswang@xxxxxxxxxxx>
Date: Thu, 26 Jan 2017 09:38:31 +0800
Subject: r8152: avoid start_xmit to call napi_schedule during autosuspend
From: hayeswang <hayeswang@xxxxxxxxxxx>
[ 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@xxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
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@xxxxxxxxxxx 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