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authorJesse Brandeburg <jesse.brandeburg@intel.com>2008-10-02 16:33:25 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-10-02 18:28:12 -0700
commita8f88ff5a5abc2ce9f7d7d2694178b2c617d713a (patch)
treeeb621b61dc32327b52f80911b73956c7515df7ae
parent37f40239f49fbc0b489d0327a700fee5b3898ac2 (diff)
e1000e: do not ever sleep in interrupt context
e1000e was apparently calling two functions that attempted to reserve the SWFLAG bit for exclusive (to hardware and firmware) access to the PHY and NVM (aka eeprom). These accesses could possibly call msleep to wait for the resource which is not allowed from interrupt context. Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com> Acked-by: Thomas Gleixner <tglx@linutronix.de> Tested-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--drivers/net/e1000e/e1000.h2
-rw-r--r--drivers/net/e1000e/netdev.c31
2 files changed, 30 insertions, 3 deletions
diff --git a/drivers/net/e1000e/e1000.h b/drivers/net/e1000e/e1000.h
index f0c48a2a679..8087bda9721 100644
--- a/drivers/net/e1000e/e1000.h
+++ b/drivers/net/e1000e/e1000.h
@@ -284,6 +284,8 @@ struct e1000_adapter {
unsigned long led_status;
unsigned int flags;
+ struct work_struct downshift_task;
+ struct work_struct update_phy_task;
};
struct e1000_info {
diff --git a/drivers/net/e1000e/netdev.c b/drivers/net/e1000e/netdev.c
index 1f767feda9a..803545b2fc8 100644
--- a/drivers/net/e1000e/netdev.c
+++ b/drivers/net/e1000e/netdev.c
@@ -1115,6 +1115,14 @@ static void e1000_clean_rx_ring(struct e1000_adapter *adapter)
writel(0, adapter->hw.hw_addr + rx_ring->tail);
}
+static void e1000e_downshift_workaround(struct work_struct *work)
+{
+ struct e1000_adapter *adapter = container_of(work,
+ struct e1000_adapter, downshift_task);
+
+ e1000e_gig_downshift_workaround_ich8lan(&adapter->hw);
+}
+
/**
* e1000_intr_msi - Interrupt Handler
* @irq: interrupt number
@@ -1139,7 +1147,7 @@ static irqreturn_t e1000_intr_msi(int irq, void *data)
*/
if ((adapter->flags & FLAG_LSC_GIG_SPEED_DROP) &&
(!(er32(STATUS) & E1000_STATUS_LU)))
- e1000e_gig_downshift_workaround_ich8lan(hw);
+ schedule_work(&adapter->downshift_task);
/*
* 80003ES2LAN workaround-- For packet buffer work-around on
@@ -1205,7 +1213,7 @@ static irqreturn_t e1000_intr(int irq, void *data)
*/
if ((adapter->flags & FLAG_LSC_GIG_SPEED_DROP) &&
(!(er32(STATUS) & E1000_STATUS_LU)))
- e1000e_gig_downshift_workaround_ich8lan(hw);
+ schedule_work(&adapter->downshift_task);
/*
* 80003ES2LAN workaround--
@@ -2912,6 +2920,21 @@ static int e1000_set_mac(struct net_device *netdev, void *p)
return 0;
}
+/**
+ * e1000e_update_phy_task - work thread to update phy
+ * @work: pointer to our work struct
+ *
+ * this worker thread exists because we must acquire a
+ * semaphore to read the phy, which we could msleep while
+ * waiting for it, and we can't msleep in a timer.
+ **/
+static void e1000e_update_phy_task(struct work_struct *work)
+{
+ struct e1000_adapter *adapter = container_of(work,
+ struct e1000_adapter, update_phy_task);
+ e1000_get_phy_info(&adapter->hw);
+}
+
/*
* Need to wait a few seconds after link up to get diagnostic information from
* the phy
@@ -2919,7 +2942,7 @@ static int e1000_set_mac(struct net_device *netdev, void *p)
static void e1000_update_phy_info(unsigned long data)
{
struct e1000_adapter *adapter = (struct e1000_adapter *) data;
- e1000_get_phy_info(&adapter->hw);
+ schedule_work(&adapter->update_phy_task);
}
/**
@@ -4578,6 +4601,8 @@ static int __devinit e1000_probe(struct pci_dev *pdev,
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);
/* Initialize link parameters. User can change them with ethtool */
adapter->hw.mac.autoneg = 1;