Commit a8f88ff5 authored by Jesse Brandeburg's avatar Jesse Brandeburg Committed by Linus Torvalds
Browse files

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: default avatarJesse Brandeburg <jesse.brandeburg@intel.com>
Acked-by: default avatarThomas Gleixner <tglx@linutronix.de>
Tested-by: default avatarThomas Gleixner <tglx@linutronix.de>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 37f40239

drivers/net/e1000e/e1000.h

+2 −0
Original line number Diff line number Diff line
@@ -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 {

drivers/net/e1000e/netdev.c

+28 −3
Original line number Diff line number Diff line
@@ -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;

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