6.6-stable review patch. If anyone has any objections, please let me know.
------------------
From: Karl Mehltretter <redacted>
[ Upstream commit cb7643b78d35392f0f434774d78b4c77b80f677f ]
On QEMU rtl8139 model, frames that arrive while the interface is
suspended still end up in the stack after resume. With pm_test=devices,
which keeps devices suspended for 5s, 200 frames sent to interface
during that time and 50 frames after resume, eth0 reports 113
received frames.
cp_suspend() is supposed to stop receiver and the transmitter, but
the mask is wrong: (~RxOn | ~TxOn) is ~0, nothing is cleared and Cmd
still reads 0x0d when cp_suspend() returns.
Use ~(RxOn | TxOn) so both bits are actually cleared.
Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Karl Mehltretter <redacted>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Link: https://patch.msgid.link/20260817043057.20099-1-kmehltretter@gmail.com (local)
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/net/ethernet/realtek/8139cp.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/net/ethernet/realtek/8139cp.c b/drivers/net/ethernet/realtek/8139cp.c
index f5786d78ed230..4091762275d6a 100644
--- a/drivers/net/ethernet/realtek/8139cp.c
+++ b/drivers/net/ethernet/realtek/8139cp.c
@@ -2066,7 +2066,7 @@ static int __maybe_unused cp_suspend(struct device *device)
/* Disable Rx and Tx */
cpw16 (IntrMask, 0);
- cpw8 (Cmd, cpr8 (Cmd) & (~RxOn | ~TxOn));
+ cpw8 (Cmd, cpr8 (Cmd) & ~(RxOn | TxOn));
spin_unlock_irqrestore (&cp->lock, flags);
--
2.53.0