[Intel-wired-lan] [PATCH] e1000e: Fixed issue with LSC pending.

[andrew at daynix.com]

From: Andrew Melnychenko <andrew at daynix.com>

Bug: https://bugzilla.redhat.com/show_bug.cgi?id=1707441
The issue was detected with QEMU and doesn't reproduce on Windows guest.
CTRL_EXT.IAME is disabled by
rev 0a8047ac68e50e4ccbadcfc6b6b070805b976885:
"to avoid disruption from potential programs that access the registers
directly."
So let's leave it like that and add interrupt pending clearance
using write to ICR. It fixes the issue when removed cable can't be detected
by the driver.

Signed-off-by: Andrew Melnychenko <andrew at daynix.com>
---
 drivers/net/ethernet/intel/e1000e/netdev.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/ethernet/intel/e1000e/netdev.c b/drivers/net/ethernet/intel/e1000e/netdev.c
index 177c6da80c57..064bb4a47131 100644
--- a/drivers/net/ethernet/intel/e1000e/netdev.c
+++ b/drivers/net/ethernet/intel/e1000e/netdev.c
@@ -1898,6 +1898,9 @@ static irqreturn_t e1000_msix_other(int __always_unused irq, void *data)
 	struct e1000_hw *hw = &adapter->hw;
 	u32 icr = er32(ICR);
 
+	if (!(er32(CTRL_EXT) & E1000_CTRL_EXT_IAME))
+		ew32(ICR, icr & ~E1000_ICR_INT_ASSERTED);
+
 	if (icr & adapter->eiac_mask)
 		ew32(ICS, (icr & adapter->eiac_mask));
 
-- 
2.24.1