[PATCH 5.4 07/90] e1000e: Revert "e1000e: Make watchdog use delayed work"

Greg Kroah-Hartman
2020-02-03T16:34:31Z

From: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

[ Upstream commit d5ad7a6a7f3c87b278d7e4973b65682be4e588dd ]

This reverts commit 59653e6497d16f7ac1d9db088f3959f57ee8c3db.

This is due to this commit causing driver crashes and connections to
reset unexpectedly.

Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/net/ethernet/intel/e1000e/e1000.h | 5 +-
drivers/net/ethernet/intel/e1000e/netdev.c | 54 ++++++++++------------
2 files changed, 27 insertions(+), 32 deletions(-)

diff --git a/drivers/net/ethernet/intel/e1000e/e1000.h b/drivers/net/ethernet/intel/e1000e/e1000.h
index 6c51b1bad8c42..37a2314d3e6b1 100644
--- a/drivers/net/ethernet/intel/e1000e/e1000.h
+++ b/drivers/net/ethernet/intel/e1000e/e1000.h
@@ -185,13 +185,12 @@ struct e1000_phy_regs {

/* board specific private data structure */
struct e1000_adapter {
+ struct timer_list watchdog_timer;
struct timer_list phy_info_timer;
struct timer_list blink_timer;

struct work_struct reset_task;
- struct delayed_work watchdog_task;
-
- struct workqueue_struct *e1000_workqueue;
+ struct work_struct watchdog_task;

const struct e1000_info *ei;

diff --git a/drivers/net/ethernet/intel/e1000e/netdev.c b/drivers/net/ethernet/intel/e1000e/netdev.c
index aa9fdda839148..c27ed7363768c 100644
--- a/drivers/net/ethernet/intel/e1000e/netdev.c
+++ b/drivers/net/ethernet/intel/e1000e/netdev.c
@@ -1780,8 +1780,7 @@ static irqreturn_t e1000_intr_msi(int __always_unused irq, void *data)
}
/* guard against interrupt when we're going down */
if (!test_bit(__E1000_DOWN, &adapter->state))
- mod_delayed_work(adapter->e1000_workqueue,
- &adapter->watchdog_task, HZ);
+ mod_timer(&adapter->watchdog_timer, jiffies + 1);
}

/* Reset on uncorrectable ECC error */
@@ -1861,8 +1860,7 @@ static irqreturn_t e1000_intr(int __always_unused irq, void *data)
}
/* guard against interrupt when we're going down */
if (!test_bit(__E1000_DOWN, &adapter->state))
- mod_delayed_work(adapter->e1000_workqueue,
- &adapter->watchdog_task, HZ);
+ mod_timer(&adapter->watchdog_timer, jiffies + 1);
}

/* Reset on uncorrectable ECC error */
@@ -1907,8 +1905,7 @@ static irqreturn_t e1000_msix_other(int __always_unused irq, void *data)
hw->mac.get_link_status = true;
/* guard against interrupt when we're going down */
if (!test_bit(__E1000_DOWN, &adapter->state))
- mod_delayed_work(adapter->e1000_workqueue,
- &adapter->watchdog_task, HZ);
+ mod_timer(&adapter->watchdog_timer, jiffies + 1);
}

if (!test_bit(__E1000_DOWN, &adapter->state))
@@ -4281,6 +4278,7 @@ void e1000e_down(struct e1000_adapter *adapter, bool reset)

napi_synchronize(&adapter->napi);

+ del_timer_sync(&adapter->watchdog_timer);
del_timer_sync(&adapter->phy_info_timer);

spin_lock(&adapter->stats64_lock);
@@ -5152,11 +5150,25 @@ static void e1000e_check_82574_phy_workaround(struct e1000_adapter *adapter)
}
}

+/**
+ * e1000_watchdog - Timer Call-back
+ * @data: pointer to adapter cast into an unsigned long
+ **/
+static void e1000_watchdog(struct timer_list *t)
+{
+ struct e1000_adapter *adapter = from_timer(adapter, t, watchdog_timer);
+
+ /* Do the rest outside of interrupt context */
+ schedule_work(&adapter->watchdog_task);
+
+ /* TODO: make this use queue_delayed_work() */
+}
+
static void e1000_watchdog_task(struct work_struct *work)
{
struct e1000_adapter *adapter = container_of(work,
struct e1000_adapter,
- watchdog_task.work);
+ watchdog_task);
struct net_device *netdev = adapter->netdev;
struct e1000_mac_info *mac = &adapter->hw.mac;
struct e1000_phy_info *phy = &adapter->hw.phy;
@@ -5404,9 +5416,8 @@ static void e1000_watchdog_task(struct work_struct *work)

/* Reset the timer */
if (!test_bit(__E1000_DOWN, &adapter->state))
- queue_delayed_work(adapter->e1000_workqueue,
- &adapter->watchdog_task,
- round_jiffies(2 * HZ));
+ mod_timer(&adapter->watchdog_timer,
+ round_jiffies(jiffies + 2 * HZ));
}

#define E1000_TX_FLAGS_CSUM 0x00000001
@@ -7259,21 +7270,11 @@ static int e1000_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
goto err_eeprom;
}

- adapter->e1000_workqueue = alloc_workqueue("%s", WQ_MEM_RECLAIM, 0,
- e1000e_driver_name);
-
- if (!adapter->e1000_workqueue) {
- err = -ENOMEM;
- goto err_workqueue;
- }
-
- INIT_DELAYED_WORK(&adapter->watchdog_task, e1000_watchdog_task);
- queue_delayed_work(adapter->e1000_workqueue, &adapter->watchdog_task,
- 0);
-
+ timer_setup(&adapter->watchdog_timer, e1000_watchdog, 0);
timer_setup(&adapter->phy_info_timer, e1000_update_phy_info, 0);

INIT_WORK(&adapter->reset_task, e1000_reset_task);
+ INIT_WORK(&adapter->watchdog_task, e1000_watchdog_task);
INIT_WORK(&adapter->downshift_task, e1000e_downshift_workaround);
INIT_WORK(&adapter->update_phy_task, e1000e_update_phy_task);
INIT_WORK(&adapter->print_hang_task, e1000_print_hw_hang);
@@ -7367,9 +7368,6 @@ static int e1000_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
return 0;

err_register:
- flush_workqueue(adapter->e1000_workqueue);
- destroy_workqueue(adapter->e1000_workqueue);
-err_workqueue:
if (!(adapter->flags & FLAG_HAS_AMT))
e1000e_release_hw_control(adapter);
err_eeprom:
@@ -7414,17 +7412,15 @@ static void e1000_remove(struct pci_dev *pdev)
* from being rescheduled.
*/
set_bit(__E1000_DOWN, &adapter->state);
+ del_timer_sync(&adapter->watchdog_timer);
del_timer_sync(&adapter->phy_info_timer);

cancel_work_sync(&adapter->reset_task);
+ cancel_work_sync(&adapter->watchdog_task);
cancel_work_sync(&adapter->downshift_task);
cancel_work_sync(&adapter->update_phy_task);
cancel_work_sync(&adapter->print_hang_task);

- cancel_delayed_work(&adapter->watchdog_task);
- flush_workqueue(adapter->e1000_workqueue);
- destroy_workqueue(adapter->e1000_workqueue);
-
if (adapter->flags & FLAG_HAS_HW_TIMESTAMP) {
cancel_work_sync(&adapter->tx_hwtstamp_work);
if (adapter->tx_hwtstamp_skb) {
--
2.20.1