From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Matthew R. Ochs" Subject: [PATCH v4 05/32] cxlflash: Fix data corruption when vLUN used over multiple cards Date: Fri, 25 Sep 2015 18:13:56 -0500 Message-ID: <1443222836-9110-1-git-send-email-mrochs@linux.vnet.ibm.com> References: <1443222593-8828-1-git-send-email-mrochs@linux.vnet.ibm.com> Return-path: Received: from e32.co.us.ibm.com ([32.97.110.150]:42433 "EHLO e32.co.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754526AbbIYXOh (ORCPT ); Fri, 25 Sep 2015 19:14:37 -0400 Received: from localhost by e32.co.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Fri, 25 Sep 2015 17:14:37 -0600 Received: from b03cxnp08028.gho.boulder.ibm.com (b03cxnp08028.gho.boulder.ibm.com [9.17.130.20]) by d03dlp02.boulder.ibm.com (Postfix) with ESMTP id 9D0643E40030 for ; Fri, 25 Sep 2015 17:14:35 -0600 (MDT) Received: from d03av03.boulder.ibm.com (d03av03.boulder.ibm.com [9.17.195.169]) by b03cxnp08028.gho.boulder.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id t8PNDPBH10093006 for ; Fri, 25 Sep 2015 16:13:25 -0700 Received: from d03av03.boulder.ibm.com (localhost [127.0.0.1]) by d03av03.boulder.ibm.com (8.14.4/8.14.4/NCO v10.0 AVout) with ESMTP id t8PNEXrW012355 for ; Fri, 25 Sep 2015 17:14:35 -0600 In-Reply-To: <1443222593-8828-1-git-send-email-mrochs@linux.vnet.ibm.com> Sender: linux-scsi-owner@vger.kernel.org List-Id: linux-scsi@vger.kernel.org To: linux-scsi@vger.kernel.org, James Bottomley , "Nicholas A. Bellinger" , Brian King , Ian Munsie , Daniel Axtens , Andrew Donnellan , Tomas Henzl , David Laight Cc: Michael Neuling , linuxppc-dev@lists.ozlabs.org, "Manoj N. Kumar" If the same virtual LUN is accessed over multiple cards, only accesses made over the first card will be valid. Accesses made over the second card will go to the wrong LUN causing data corruption. This is because the global LUN's mode word was being used to determine whether the LUN table for that card needs to be programmed. The mode word would be setup by the first card, causing the LUN table for the second card to not be programmed. By unconditionally initializing the LUN table (not depending on the mode word), the problem is avoided. Signed-off-by: Matthew R. Ochs Signed-off-by: Manoj N. Kumar Reviewed-by: Brian King --- drivers/scsi/cxlflash/vlun.c | 16 ++++++++-------- 1 file changed, 8 insertions(+), 8 deletions(-) diff --git a/drivers/scsi/cxlflash/vlun.c b/drivers/scsi/cxlflash/vlun.c index 68994c4..96b074f 100644 --- a/drivers/scsi/cxlflash/vlun.c +++ b/drivers/scsi/cxlflash/vlun.c @@ -915,16 +915,9 @@ int cxlflash_disk_virtual_open(struct scsi_device *sdev, void *arg) pr_debug("%s: ctxid=%llu ls=0x%llx\n", __func__, ctxid, lun_size); + /* Setup the LUNs block allocator on first call */ mutex_lock(&gli->mutex); if (gli->mode == MODE_NONE) { - /* Setup the LUN table and block allocator on first call */ - rc = init_luntable(cfg, lli); - if (rc) { - dev_err(dev, "%s: call to init_luntable failed " - "rc=%d!\n", __func__, rc); - goto err0; - } - rc = init_vlun(lli); if (rc) { dev_err(dev, "%s: call to init_vlun failed rc=%d!\n", @@ -942,6 +935,13 @@ int cxlflash_disk_virtual_open(struct scsi_device *sdev, void *arg) } mutex_unlock(&gli->mutex); + rc = init_luntable(cfg, lli); + if (rc) { + dev_err(dev, "%s: call to init_luntable failed rc=%d!\n", + __func__, rc); + goto err1; + } + ctxi = get_context(cfg, rctxid, lli, 0); if (unlikely(!ctxi)) { dev_err(dev, "%s: Bad context! (%llu)\n", __func__, ctxid); -- 2.1.0