linux-kernel - [ 13/37] e1000: add dropped DMA receive enable back in for WoL

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Message-Id: <20120817030245.769285357@decadent.org.uk>
Date:	Fri, 17 Aug 2012 04:02:56 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Dean Nelson <dnelson@...hat.com>,
	Tobias Klausmann <klausman@...warzvogel.de>,
	Aaron Brown <aaron.f.brown@...el.com>,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Subject: [ 13/37] e1000: add dropped DMA receive enable back in for WoL

3.2-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Dean Nelson <dnelson@...hat.com>

commit b868179c47e9e8eadcd04c1f3105998e528988a3 upstream.

Commit d5bc77a223b0e9b9dfb002048d2b34a79e7d0b48 broke Wake-on-LAN by
inadvertently dropping the enabling of DMA receives.

Restore the enabling of DMA receives for WoL.

This is applicable to 3.1+ stable trees.

Reported-by: Tobias Klausmann <klausman@...warzvogel.de>
Signed-off-by: Dean Nelson <dnelson@...hat.com>
Tested-by: Tobias Klausmann <klausman@...warzvogel.de>
Tested-by: Aaron Brown <aaron.f.brown@...el.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/net/ethernet/intel/e1000/e1000_main.c |   10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/intel/e1000/e1000_main.c b/drivers/net/ethernet/intel/e1000/e1000_main.c
index 669ca38..d94d64b 100644
--- a/drivers/net/ethernet/intel/e1000/e1000_main.c
+++ b/drivers/net/ethernet/intel/e1000/e1000_main.c
@@ -4740,12 +4740,14 @@ static int __e1000_shutdown(struct pci_dev *pdev, bool *enable_wake)
 		e1000_setup_rctl(adapter);
 		e1000_set_rx_mode(netdev);
 
+		rctl = er32(RCTL);
+
 		/* turn on all-multi mode if wake on multicast is enabled */
-		if (wufc & E1000_WUFC_MC) {
-			rctl = er32(RCTL);
+		if (wufc & E1000_WUFC_MC)
 			rctl |= E1000_RCTL_MPE;
-			ew32(RCTL, rctl);
-		}
+
+		/* enable receives in the hardware */
+		ew32(RCTL, rctl | E1000_RCTL_EN);
 
 		if (hw->mac_type >= e1000_82540) {
 			ctrl = er32(CTRL);


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