[B] [PATCH 1/1] r8169: don't use MSI before RTL8168d

[Kai-Heng Feng]

From: Heiner Kallweit <hkallweit1 at gmail.com>

BugLink: https://bugs.launchpad.net/bugs/1838477

It was reported that after resuming from suspend network fails with
error "do_IRQ: 3.38 No irq handler for vector", see [0]. Enabling WoL
can work around the issue, but the only actual fix is to disable MSI.
So let's mimic the behavior of the vendor driver and disable MSI on
all chip versions before RTL8168d.

[0] https://bugzilla.kernel.org/show_bug.cgi?id=204079

Fixes: 6c6aa15fdea5 ("r8169: improve interrupt handling")
Reported-by: Dušan Dragić <dragic.dusan at gmail.com>
Tested-by: Dušan Dragić <dragic.dusan at gmail.com>
Signed-off-by: Heiner Kallweit <hkallweit1 at gmail.com>
Signed-off-by: David S. Miller <davem at davemloft.net>
(backported from commit 003bd5b4a7b4a94b501e3a1e2e7c9df6b2a94ed4)
Signed-off-by: Kai-Heng Feng <kai.heng.feng at canonical.com>
---
 drivers/net/ethernet/realtek/r8169.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/realtek/r8169.c b/drivers/net/ethernet/realtek/r8169.c
index f0f768a0fd8d..f3a143a0eec1 100644
--- a/drivers/net/ethernet/realtek/r8169.c
+++ b/drivers/net/ethernet/realtek/r8169.c
@@ -8304,13 +8304,18 @@ static int rtl_alloc_irq(struct rtl8169_private *tp)
 	void __iomem *ioaddr = tp->mmio_addr;
 	unsigned int flags;
 
-	if (tp->mac_version <= RTL_GIGA_MAC_VER_06) {
+	switch (tp->mac_version) {
+	case RTL_GIGA_MAC_VER_02 ... RTL_GIGA_MAC_VER_06:
 		RTL_W8(Cfg9346, Cfg9346_Unlock);
 		RTL_W8(Config2, RTL_R8(Config2) & ~MSIEnable);
 		RTL_W8(Cfg9346, Cfg9346_Lock);
+		/* fall through */
+	case RTL_GIGA_MAC_VER_07 ... RTL_GIGA_MAC_VER_24:
 		flags = PCI_IRQ_LEGACY;
-	} else {
+		break;
+	default:
 		flags = PCI_IRQ_ALL_TYPES;
+		break;
 	}
 
 	return pci_alloc_irq_vectors(tp->pci_dev, 1, 1, flags);
-- 
2.17.1