From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Woodhouse Subject: [PATCH 2/7] 8139cp: Do not re-enable RX interrupts in cp_tx_timeout() Date: Mon, 21 Sep 2015 15:02:07 +0100 Message-ID: <1442844127.7367.11.camel@infradead.org> References: <1442843991.7367.4.camel@infradead.org> Mime-Version: 1.0 Content-Type: multipart/signed; micalg="sha-1"; protocol="application/x-pkcs7-signature"; boundary="=-BRg+wPE5arB+cWBsVeY0" Cc: romieu@fr.zoreil.com To: netdev@vger.kernel.org Return-path: Received: from bombadil.infradead.org ([198.137.202.9]:44100 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932077AbbIUOCL (ORCPT ); Mon, 21 Sep 2015 10:02:11 -0400 In-Reply-To: <1442843991.7367.4.camel@infradead.org> Sender: netdev-owner@vger.kernel.org List-ID: --=-BRg+wPE5arB+cWBsVeY0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable From: David Woodhouse If an RX interrupt was already received but NAPI has not yet run when the RX timeout happens, we end up in cp_tx_timeout() with RX interrupts already disabled. Blindly re-enabling them will cause an IRQ storm. This is somewhat less painful than it was a few minutes ago before I fixed the return value from cp_interrupt(), but still suboptimal. Unconditionally leave RX interrupts disabled after the reset, and schedule NAPI to check the receive ring and re-enable them. Signed-off-by: David Woodhouse --- drivers/net/ethernet/realtek/8139cp.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/net/ethernet/realtek/8139cp.c b/drivers/net/ethernet/r= ealtek/8139cp.c index f1054ad..d12fc50 100644 --- a/drivers/net/ethernet/realtek/8139cp.c +++ b/drivers/net/ethernet/realtek/8139cp.c @@ -1269,9 +1269,10 @@ static void cp_tx_timeout(struct net_device *dev) rc =3D cp_init_rings(cp); cp_start_hw(cp); __cp_set_rx_mode(dev); - cp_enable_irq(cp); + cpw16_f(IntrMask, cp_norx_intr_mask); =20 netif_wake_queue(dev); + napi_schedule_irqoff(&cp->napi); =20 spin_unlock_irqrestore(&cp->lock, flags); } --=20 2.4.3 --=20 David Woodhouse Open Source Technology Centre David.Woodhouse@intel.com Intel Corporation --=-BRg+wPE5arB+cWBsVeY0 Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 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