[PATCH] tg3: Disable tg3 device on system reboot to avoid triggering AER

Commit d60cd06331a3 ("PM: ACPI: reboot: Use S5 for reboot") caused a
reboot hang on one Dell servers so the commit was reverted.

Someone managed to collect the AER log and it's caused by MSI:
[ 148.762067] ACPI: Preparing to enter system sleep state S5
[ 148.794638] {1}[Hardware Error]: Hardware error from APEI Generic Hardware Error Source: 5
[ 148.803731] {1}[Hardware Error]: event severity: recoverable
[ 148.810191] {1}[Hardware Error]: Error 0, type: fatal
[ 148.816088] {1}[Hardware Error]: section_type: PCIe error
[ 148.822391] {1}[Hardware Error]: port_type: 0, PCIe end point
[ 148.829026] {1}[Hardware Error]: version: 3.0
[ 148.834266] {1}[Hardware Error]: command: 0x0006, status: 0x0010
[ 148.841140] {1}[Hardware Error]: device_id: 0000:04:00.0
[ 148.847309] {1}[Hardware Error]: slot: 0
[ 148.852077] {1}[Hardware Error]: secondary_bus: 0x00
[ 148.857876] {1}[Hardware Error]: vendor_id: 0x14e4, device_id: 0x165f
[ 148.865145] {1}[Hardware Error]: class_code: 020000
[ 148.870845] {1}[Hardware Error]: aer_uncor_status: 0x00100000, aer_uncor_mask: 0x00010000
[ 148.879842] {1}[Hardware Error]: aer_uncor_severity: 0x000ef030
[ 148.886575] {1}[Hardware Error]: TLP Header: 40000001 0000030f 90028090 00000000
[ 148.894823] tg3 0000:04:00.0: AER: aer_status: 0x00100000, aer_mask: 0x00010000
[ 148.902795] tg3 0000:04:00.0: AER: [20] UnsupReq (First)
[ 148.910234] tg3 0000:04:00.0: AER: aer_layer=Transaction Layer, aer_agent=Requester ID
[ 148.918806] tg3 0000:04:00.0: AER: aer_uncor_severity: 0x000ef030
[ 148.925558] tg3 0000:04:00.0: AER: TLP Header: 40000001 0000030f 90028090 00000000

The MSI is probably raised by incoming packets, so power down the device
and disable bus mastering to stop the traffic, as user confirmed this
approach works.

In addition to that, be extra safe and cancel reset task if it's running.

Cc: Josef Bacik <josef@toxicpanda.com>
Link: https://lore.kernel.org/all/b8db79e6857c41dab4ef08bdf826ea7c47e3bafc.1615947283.git.josef@toxicpanda.com/
BugLink: https://bugs.launchpad.net/bugs/1917471
Signed-off-by: Kai-Heng Feng <redacted>
---
 drivers/net/ethernet/broadcom/tg3.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/broadcom/tg3.c b/drivers/net/ethernet/broadcom/tg3.c
index db1e9d810b416..4fe9e2539eac1 100644
--- a/drivers/net/ethernet/broadcom/tg3.c
+++ b/drivers/net/ethernet/broadcom/tg3.c

@@ -18077,15 +18077,18 @@ static void tg3_shutdown(struct pci_dev *pdev)
 	struct tg3 *tp = netdev_priv(dev);
 
 	rtnl_lock();
+
+	tg3_reset_task_cancel(tp);
 	netif_device_detach(dev);
 
 	if (netif_running(dev))
 		dev_close(dev);
 
-	if (system_state == SYSTEM_POWER_OFF)
-		tg3_power_down(tp);
+	tg3_power_down(tp);
 
 	rtnl_unlock();
+
+	pci_disable_device(pdev);
 }
 
 /**

-- 
2.36.1

Hi Josef,

On Thu, Aug 25, 2022 at 2:39 PM Kai-Heng Feng
[off-list ref] wrote:

Commit d60cd06331a3 ("PM: ACPI: reboot: Use S5 for reboot") caused a
reboot hang on one Dell servers so the commit was reverted.

Can you please re-apply commit d60cd06331a3 and give this patch a try? Thanks!

Kai-Heng

On Thu, 25 Aug 2022 14:38:52 +0800 Kai-Heng Feng wrote:

 	rtnl_lock();
+
+	tg3_reset_task_cancel(tp);

Doesn't this "task" take rtnl_lock()? Looks deadlocky.

On Fri, Aug 26, 2022 at 1:44 AM Jakub Kicinski [off-list ref] wrote:

On Thu, 25 Aug 2022 14:38:52 +0800 Kai-Heng Feng wrote:

quoted

      rtnl_lock();
+
+     tg3_reset_task_cancel(tp);

Doesn't this "task" take rtnl_lock()? Looks deadlocky.

Thanks for the review. I sent v2 to address it.

Kai-Heng