linux-kernel - [PATCH 2.6.28 1/1] cxgb3

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Message-ID: <20080926000528.11959.63712.stgit@speedy5>
Date:	Thu, 25 Sep 2008 17:05:28 -0700
From:	Divy Le Ray <divy@...lsio.com>
To:	jeff@...zik.org
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	swise@...ngridcomputing.com
Subject: [PATCH 2.6.28 1/1] cxgb3 - fix race in EEH

From: Divy Le Ray <divy@...lsio.com>

A SGE queue set timer might access registers while in EEH recovery,
triggering an EEH error loop. Stop all timers early in EEH process.

Signed-off-by: Divy Le Ray <divy@...lsio.com>
---

 drivers/net/cxgb3/adapter.h    |    1 +
 drivers/net/cxgb3/cxgb3_main.c |    5 +++++
 drivers/net/cxgb3/sge.c        |   21 ++++++++++++++++++---
 3 files changed, 24 insertions(+), 3 deletions(-)

diff --git a/drivers/net/cxgb3/adapter.h b/drivers/net/cxgb3/adapter.h
index 2711404..b1a694b 100644
--- a/drivers/net/cxgb3/adapter.h
+++ b/drivers/net/cxgb3/adapter.h
@@ -285,6 +285,7 @@ void t3_os_link_changed(struct adapter *adapter, int port_id, int link_status,
 
 void t3_sge_start(struct adapter *adap);
 void t3_sge_stop(struct adapter *adap);
+void t3_stop_sge_timers(struct adapter *adap);
 void t3_free_sge_resources(struct adapter *adap);
 void t3_sge_err_intr_handler(struct adapter *adapter);
 irq_handler_t t3_intr_handler(struct adapter *adap, int polling);
diff --git a/drivers/net/cxgb3/cxgb3_main.c b/drivers/net/cxgb3/cxgb3_main.c
index 5447f3e..d355c82 100644
--- a/drivers/net/cxgb3/cxgb3_main.c
+++ b/drivers/net/cxgb3/cxgb3_main.c
@@ -479,6 +479,7 @@ static int setup_sge_qsets(struct adapter *adap)
 							     irq_idx,
 				&adap->params.sge.qset[qset_idx], ntxq, dev);
 			if (err) {
+				t3_stop_sge_timers(adap);
 				t3_free_sge_resources(adap);
 				return err;
 			}
@@ -2449,6 +2450,9 @@ static pci_ers_result_t t3_io_error_detected(struct pci_dev *pdev,
 	    test_bit(OFFLOAD_DEVMAP_BIT, &adapter->open_device_map))
 		offload_close(&adapter->tdev);
 
+	/* Stop SGE timers */
+	t3_stop_sge_timers(adapter);
+
 	adapter->flags &= ~FULL_INIT_DONE;
 
 	pci_disable_device(pdev);
@@ -2801,6 +2805,7 @@ static void __devexit remove_one(struct pci_dev *pdev)
 		    if (test_bit(i, &adapter->registered_device_map))
 			unregister_netdev(adapter->port[i]);
 
+		t3_stop_sge_timers(adapter);
 		t3_free_sge_resources(adapter);
 		cxgb_disable_msi(adapter);
 
diff --git a/drivers/net/cxgb3/sge.c b/drivers/net/cxgb3/sge.c
index f78a42c..52f4138 100644
--- a/drivers/net/cxgb3/sge.c
+++ b/drivers/net/cxgb3/sge.c
@@ -603,9 +603,6 @@ static void t3_free_qset(struct adapter *adapter, struct sge_qset *q)
 	int i;
 	struct pci_dev *pdev = adapter->pdev;
 
-	if (q->tx_reclaim_timer.function)
-		del_timer_sync(&q->tx_reclaim_timer);
-
 	for (i = 0; i < SGE_RXQ_PER_SET; ++i)
 		if (q->fl[i].desc) {
 			spin_lock_irq(&adapter->sge.reg_lock);
@@ -3008,6 +3005,24 @@ err:
 }
 
 /**
+ *	t3_stop_sge_timers - stop SGE timer call backs
+ *	@adap: the adapter
+ *
+ *	Stops each SGE queue set's timer call back
+ */
+void t3_stop_sge_timers(struct adapter *adap)
+{
+	int i;
+
+	for (i = 0; i < SGE_QSETS; ++i) {
+		struct sge_qset *q = &adap->sge.qs[i];
+
+		if (q->tx_reclaim_timer.function)
+			del_timer_sync(&q->tx_reclaim_timer);
+	}
+}
+
+/**
  *	t3_free_sge_resources - free SGE resources
  *	@adap: the adapter
  *

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