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ixgbe: only process one ixgbe_watchdog_task at a time. 

Processing multiple ixgbe_watchdog_task calls may cause
the link_up variable and IXGBE_FLAG_NEED_LINK_UPDATE flag
to be set incorrectly.  In the worse case this is causing
the netif_carrier_off to be called inappropriately which
results in an interface that can't be brought up.

Although schedule_work() will only schedule the task if
it is not already on the work queue the WORK_STRUCT_PENDING
bits are cleared just before calling the work function.
This allows WORK_STRUCT_PENDING to be cleared, the work
function to start and meanwhile schedule another task.

This patch adds a mutex to the watchdog task. This bug is
actualized by changing DCB settings or doing extended
cable pull or reset tests.

Signed-off-by: John Fastabend <john.r.fastabend@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
John Fastabend 2010-02-03 14:23:32 +00:00 committed by David S. Miller
parent 9c119ba54c
commit 10eec95569
2 changed files with 17 additions and 13 deletions
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17
drivers/net/ixgbe/ixgbe.h
View File

@ -341,15 +341,14 @@ struct ixgbe_adapter {
#define IXGBE_FLAG_VMDQ_ENABLED (u32)(1 << 19)
#define IXGBE_FLAG_FAN_FAIL_CAPABLE (u32)(1 << 20)
#define IXGBE_FLAG_NEED_LINK_UPDATE (u32)(1 << 22)
#define IXGBE_FLAG_IN_WATCHDOG_TASK (u32)(1 << 23)
#define IXGBE_FLAG_IN_SFP_LINK_TASK (u32)(1 << 24)
#define IXGBE_FLAG_IN_SFP_MOD_TASK (u32)(1 << 25)
#define IXGBE_FLAG_FDIR_HASH_CAPABLE (u32)(1 << 26)
#define IXGBE_FLAG_FDIR_PERFECT_CAPABLE (u32)(1 << 27)
#define IXGBE_FLAG_FCOE_CAPABLE (u32)(1 << 28)
#define IXGBE_FLAG_FCOE_ENABLED (u32)(1 << 29)
#define IXGBE_FLAG_SRIOV_CAPABLE (u32)(1 << 30)
#define IXGBE_FLAG_SRIOV_ENABLED (u32)(1 << 31)
#define IXGBE_FLAG_IN_SFP_LINK_TASK (u32)(1 << 23)
#define IXGBE_FLAG_IN_SFP_MOD_TASK (u32)(1 << 24)
#define IXGBE_FLAG_FDIR_HASH_CAPABLE (u32)(1 << 25)
#define IXGBE_FLAG_FDIR_PERFECT_CAPABLE (u32)(1 << 26)
#define IXGBE_FLAG_FCOE_CAPABLE (u32)(1 << 27)
#define IXGBE_FLAG_FCOE_ENABLED (u32)(1 << 28)
#define IXGBE_FLAG_SRIOV_CAPABLE (u32)(1 << 29)
#define IXGBE_FLAG_SRIOV_ENABLED (u32)(1 << 30)
u32 flags2;
#define IXGBE_FLAG2_RSC_CAPABLE (u32)(1)

13
drivers/net/ixgbe/ixgbe_main.c
View File

@ -4996,6 +4996,8 @@ static void ixgbe_fdir_reinit_task(struct work_struct *work)
netif_tx_start_all_queues(adapter->netdev);
}
static DEFINE_MUTEX(ixgbe_watchdog_lock);
/**
* ixgbe_watchdog_task - worker thread to bring link up
* @work: pointer to work_struct containing our data
@ -5007,13 +5009,16 @@ static void ixgbe_watchdog_task(struct work_struct *work)
watchdog_task);
struct net_device *netdev = adapter->netdev;
struct ixgbe_hw *hw = &adapter->hw;
u32 link_speed = adapter->link_speed;
bool link_up = adapter->link_up;
u32 link_speed;
bool link_up;
int i;
struct ixgbe_ring *tx_ring;
int some_tx_pending = 0;
adapter->flags |= IXGBE_FLAG_IN_WATCHDOG_TASK;
mutex_lock(&ixgbe_watchdog_lock);
link_up = adapter->link_up;
link_speed = adapter->link_speed;
if (adapter->flags & IXGBE_FLAG_NEED_LINK_UPDATE) {
hw->mac.ops.check_link(hw, &link_speed, &link_up, false);
@ -5102,7 +5107,7 @@ static void ixgbe_watchdog_task(struct work_struct *work)
}
ixgbe_update_stats(adapter);
adapter->flags &= ~IXGBE_FLAG_IN_WATCHDOG_TASK;
mutex_unlock(&ixgbe_watchdog_lock);
}
static int ixgbe_tso(struct ixgbe_adapter *adapter,