r8169: reset IntrStatus after chip reset

Original comment (Karsten):
On a MSI MS-6702E mainboard, when in rtl8169_init_one() for the first time
after BIOS has run, IntrStatus reads 5 after chip has been reset.
IntrStatus should equal 0 there, so patch changes IntrStatus reset to happen
after chip reset instead of before.

Remark (Francois):
Assuming that the loglevel of the driver is increased above NETIF_MSG_INTR,
the bug reveals itself with a typical "interrupt 0025 in poll" message
at startup. In retrospect, the message should had been read as an hint of
an unexpected hardware state several months ago :o(

Fixes (at least part of) https://bugzilla.redhat.com/show_bug.cgi?id=460747

Signed-off-by: Karsten Wiese <fzu@wemgehoertderstaat.de>
Signed-off-by: Francois Romieu <romieu@fr.zoreil.com>
Tested-by: Josep <josep.puigdemont@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 3 insertions, 2 deletions

diff --git a/drivers/net/r8169.c b/drivers/net/r8169.c
index 06c53522266..e1a638a05f8 100644
--- a/drivers/net/r8169.c
+++ b/drivers/net/r8169.c
@@ -2075,8 +2075,7 @@ rtl8169_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
         if (!tp->pcie_cap && netif_msg_probe(tp))
                 dev_info(&pdev->dev, "no PCI Express capability\n");
 
-        /* Unneeded ? Don't mess with Mrs. Murphy. */
-        rtl8169_irq_mask_and_ack(ioaddr);
+        RTL_W16(IntrMask, 0x0000);
 
         /* Soft reset the chip. */
         RTL_W8(ChipCmd, CmdReset);
@@ -2088,6 +2087,8 @@ rtl8169_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
                 msleep_interruptible(1);
         }
 
+        RTL_W16(IntrStatus, 0xffff);
+
         /* Identify chip attached to board */
         rtl8169_get_mac_version(tp, ioaddr);