Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754012AbaANA24 (ORCPT ); Mon, 13 Jan 2014 19:28:56 -0500 Received: from mail.linuxfoundation.org ([140.211.169.12]:54422 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753942AbaANA2o (ORCPT ); Mon, 13 Jan 2014 19:28:44 -0500 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Nat Gurumoorthy , Michael Chan , "David S. Miller" Subject: [PATCH 3.12 18/77] tg3: Initialize REG_BASE_ADDR at PCI config offset 120 to 0 Date: Mon, 13 Jan 2014 16:27:39 -0800 Message-Id: <20140114002753.020523421@linuxfoundation.org> X-Mailer: git-send-email 1.8.5.1.163.gd7aced9 In-Reply-To: <20140114002752.497010554@linuxfoundation.org> References: <20140114002752.497010554@linuxfoundation.org> User-Agent: quilt/0.61-1 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 3.12-stable review patch. If anyone has any objections, please let me know. ------------------ From: Nat Gurumoorthy [ Upstream commit 388d3335575f4c056dcf7138a30f1454e2145cd8 ] The new tg3 driver leaves REG_BASE_ADDR (PCI config offset 120) uninitialized. From power on reset this register may have garbage in it. The Register Base Address register defines the device local address of a register. The data pointed to by this location is read or written using the Register Data register (PCI config offset 128). When REG_BASE_ADDR has garbage any read or write of Register Data Register (PCI 128) will cause the PCI bus to lock up. The TCO watchdog will fire and bring down the system. Signed-off-by: Nat Gurumoorthy Acked-by: Michael Chan Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- drivers/net/ethernet/broadcom/tg3.c | 3 +++ 1 file changed, 3 insertions(+) --- a/drivers/net/ethernet/broadcom/tg3.c +++ b/drivers/net/ethernet/broadcom/tg3.c @@ -16485,6 +16485,9 @@ static int tg3_get_invariants(struct tg3 /* Clear this out for sanity. */ tw32(TG3PCI_MEM_WIN_BASE_ADDR, 0); + /* Clear TG3PCI_REG_BASE_ADDR to prevent hangs. */ + tw32(TG3PCI_REG_BASE_ADDR, 0); + pci_read_config_dword(tp->pdev, TG3PCI_PCISTATE, &pci_state_reg); if ((pci_state_reg & PCISTATE_CONV_PCI_MODE) == 0 && -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/