Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753673AbcDUSXA (ORCPT ); Thu, 21 Apr 2016 14:23:00 -0400 Received: from mga14.intel.com ([192.55.52.115]:21993 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752795AbcDUSPv (ORCPT ); Thu, 21 Apr 2016 14:15:51 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.24,513,1455004800"; d="scan'208";a="960003093" From: Andy Shevchenko To: Tejun Heo , linux-ide@vger.kernel.org, Rob Herring , linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, Christian Lamparter , =?UTF-8?q?M=C3=A5ns=20Rullg=C3=A5rd?= , Julian Margetson Subject: [PATCH v1 02/23] ata: sata_dwc_460ex: fix crash on offline links without an attached drive Date: Thu, 21 Apr 2016 21:15:23 +0300 Message-Id: <1461262544-115408-3-git-send-email-andriy.shevchenko@linux.intel.com> X-Mailer: git-send-email 2.8.0.rc3 In-Reply-To: <1461262544-115408-1-git-send-email-andriy.shevchenko@linux.intel.com> References: <1461262544-115408-1-git-send-email-andriy.shevchenko@linux.intel.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1731 Lines: 55 From: Christian Lamparter This patch fixes Machine Check "Data Write PLB Error" which happens when libata-sff's ata_sff_dev_select is trying to write into the device_addr in order to select a drive. However, SATA has no master or slave devices like the old ATA Bus, therefore selecting a different drive is kind of pointless. Data Write PLB Error Oops: Machine check, sig: 7 [#1] PowerPC 44x Platform Modules linked in: CPU: 0 PID: 508 Comm: scsi_eh_0 Not tainted 4.6.0-rc3-next-20160412+ #10 [...] NIP [c027e820] ata_sff_dev_select+0x3c/0x44 LR [c027e810] ata_sff_dev_select+0x2c/0x44 Call Trace: [cec31cd0] [c027da00] ata_sff_postreset+0x40/0xb4 (unreliable) [cec31ce0] [c027a03c] ata_eh_reset+0x5cc/0x928 [cec31d60] [c027a840] ata_eh_recover+0x330/0x10bc [cec31df0] [c027bae0] ata_do_eh+0x4c/0xa4 [...] Signed-off-by: Christian Lamparter --- drivers/ata/sata_dwc_460ex.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/ata/sata_dwc_460ex.c b/drivers/ata/sata_dwc_460ex.c index 5213e22..7f95389 100644 --- a/drivers/ata/sata_dwc_460ex.c +++ b/drivers/ata/sata_dwc_460ex.c @@ -1134,6 +1134,11 @@ static int sata_dwc_hardreset(struct ata_link *link, unsigned int *class, return ret; } +static void sata_dwc_dev_select(struct ata_port *ap, unsigned int device) +{ + /* SATA DWC is master only */ +} + /* * scsi mid-layer and libata interface structures */ @@ -1164,6 +1169,8 @@ static struct ata_port_operations sata_dwc_ops = { .port_start = sata_dwc_port_start, .port_stop = sata_dwc_port_stop, + .sff_dev_select = sata_dwc_dev_select, + .bmdma_setup = sata_dwc_bmdma_setup, .bmdma_start = sata_dwc_bmdma_start, }; -- 2.8.0.rc3