From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx0a-001b2d01.pphosted.com (mx0a-001b2d01.pphosted.com [148.163.156.1]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 3sQrZZ35zFzDsN0 for ; Sat, 3 Sep 2016 06:39:18 +1000 (AEST) Received: from pps.filterd (m0098410.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.17/8.16.0.17) with SMTP id u82KXG7I143914 for ; Fri, 2 Sep 2016 16:39:16 -0400 Received: from e18.ny.us.ibm.com (e18.ny.us.ibm.com [129.33.205.208]) by mx0a-001b2d01.pphosted.com with ESMTP id 257639xqd3-1 (version=TLSv1.2 cipher=AES256-SHA bits=256 verify=NOT) for ; Fri, 02 Sep 2016 16:39:16 -0400 Received: from localhost by e18.ny.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Fri, 2 Sep 2016 16:39:15 -0400 From: Uma Krishnan To: linux-scsi@vger.kernel.org, James Bottomley , "Martin K. Petersen" , "Matthew R. Ochs" , "Manoj N. Kumar" Cc: Brian King , linuxppc-dev@lists.ozlabs.org, Ian Munsie , Andrew Donnellan , Frederic Barrat , Christophe Lombard Subject: [PATCH 1/6] cxlflash: Scan host only after the port is ready for I/O Date: Fri, 2 Sep 2016 15:38:48 -0500 In-Reply-To: <1472848612-64888-1-git-send-email-ukrishn@linux.vnet.ibm.com> References: <1472848612-64888-1-git-send-email-ukrishn@linux.vnet.ibm.com> Message-Id: <1472848728-64961-1-git-send-email-ukrishn@linux.vnet.ibm.com> List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , When a port link is established, the AFU sends a 'link up' interrupt. After the link is up, corresponding initialization steps are performed on the card. Following that, when the card is ready for I/O, the AFU sends 'login succeeded' interrupt. Today, cxlflash invokes scsi_scan_host() upon receipt of both interrupts. SCSI commands sent to the port prior to the 'login succeeded' interrupt will fail with 'port not available' error. This is not desirable. Moreover, when async_scan is active for the host, subsequent scan calls are terminated with error. Due to this, the scsi_scan_host() call performed after 'login succeeded' interrupt could portentially return error and the devices may not be scanned properly. To avoid this problem, scsi_scan_host() should be called only after the 'login succeeded' interrupt. Signed-off-by: Uma Krishnan --- drivers/scsi/cxlflash/main.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/scsi/cxlflash/main.c b/drivers/scsi/cxlflash/main.c index 661bb94..b063c41 100644 --- a/drivers/scsi/cxlflash/main.c +++ b/drivers/scsi/cxlflash/main.c @@ -1187,7 +1187,7 @@ static const struct asyc_intr_info ainfo[] = { {SISL_ASTATUS_FC0_LOGI_F, "login failed", 0, CLR_FC_ERROR}, {SISL_ASTATUS_FC0_LOGI_S, "login succeeded", 0, SCAN_HOST}, {SISL_ASTATUS_FC0_LINK_DN, "link down", 0, 0}, - {SISL_ASTATUS_FC0_LINK_UP, "link up", 0, SCAN_HOST}, + {SISL_ASTATUS_FC0_LINK_UP, "link up", 0, 0}, {SISL_ASTATUS_FC1_OTHER, "other error", 1, CLR_FC_ERROR | LINK_RESET}, {SISL_ASTATUS_FC1_LOGO, "target initiated LOGO", 1, 0}, {SISL_ASTATUS_FC1_CRC_T, "CRC threshold exceeded", 1, LINK_RESET}, @@ -1195,7 +1195,7 @@ static const struct asyc_intr_info ainfo[] = { {SISL_ASTATUS_FC1_LOGI_F, "login failed", 1, CLR_FC_ERROR}, {SISL_ASTATUS_FC1_LOGI_S, "login succeeded", 1, SCAN_HOST}, {SISL_ASTATUS_FC1_LINK_DN, "link down", 1, 0}, - {SISL_ASTATUS_FC1_LINK_UP, "link up", 1, SCAN_HOST}, + {SISL_ASTATUS_FC1_LINK_UP, "link up", 1, 0}, {0x0, "", 0, 0} /* terminator */ }; -- 2.1.0