[D] r8169: don't use MSI before RTL8168d
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Message ID 20190827162938.9407-3-kai.heng.feng@canonical.com
State New
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  • [D] r8169: don't use MSI before RTL8168d
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Commit Message

Kai-Heng Feng Aug. 27, 2019, 4:29 p.m. UTC
From: Heiner Kallweit <hkallweit1@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@gmail.com>
Tested-by: Dušan Dragić <dragic.dusan@gmail.com>
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
(backported from commit 003bd5b4a7b4a94b501e3a1e2e7c9df6b2a94ed4)
Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
 drivers/net/ethernet/realtek/r8169.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

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diff --git a/drivers/net/ethernet/realtek/r8169.c b/drivers/net/ethernet/realtek/r8169.c
index cb65f6a48eba..02fd83ea8e54 100644
--- a/drivers/net/ethernet/realtek/r8169.c
+++ b/drivers/net/ethernet/realtek/r8169.c
@@ -7005,13 +7005,18 @@  static int rtl_alloc_irq(struct rtl8169_private *tp)
 	unsigned int flags;
-	if (tp->mac_version <= RTL_GIGA_MAC_VER_06) {
+	switch (tp->mac_version) {
 		RTL_W8(tp, Cfg9346, Cfg9346_Unlock);
 		RTL_W8(tp, Config2, RTL_R8(tp, Config2) & ~MSIEnable);
 		RTL_W8(tp, Cfg9346, Cfg9346_Lock);
+		/* fall through */
 		flags = PCI_IRQ_LEGACY;
-	} else {
+		break;
+	default:
 		flags = PCI_IRQ_ALL_TYPES;
+		break;
 	return pci_alloc_irq_vectors(tp->pci_dev, 1, 1, flags);