From cb7643b78d35392f0f434774d78b4c77b80f677f Mon Sep 17 00:00:00 2001 From: Karl Mehltretter Date: Mon, 17 Aug 2026 06:30:57 +0200 Subject: [PATCH] 8139cp: fix Rx and Tx not being disabled in cp_suspend 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 Reviewed-by: Andrew Lunn Link: https://patch.msgid.link/20260817043057.20099-1-kmehltretter@gmail.com Signed-off-by: Paolo Abeni --- 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 5652da8a178c..9016527e229a 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);