linux-kernel - [PATCH 4.19 30/41] scsi: lpfc: fix block guard enablement on SLI3 adapters

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Date:   Thu,  6 Dec 2018 15:39:10 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, David Bond <dbond@...e.com>,
        Martin Wilck <mwilck@...e.com>,
        Hannes Reinecke <hare@...e.com>,
        James Smart <jsmart2021@...il.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>
Subject: [PATCH 4.19 30/41] scsi: lpfc: fix block guard enablement on SLI3 adapters

4.19-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Martin Wilck <mwilck@...e.com>

commit dfb7513374c1f8e7cd595106fbdba3fd07ebaf30 upstream.

Since f44ac12f1dcc, BG enablement is tracked with the LPFC_SLI3_BG_ENABLED
bit, which is set in lpfc_get_cfgparam before lpfc_sli_config_sli_port() is
called. The bit shouldn't be cleared before checking the feature.  Based on
problem analysis by David Bond.

Fixes: f44ac12f1dcc "scsi: lpfc: Memory allocation error during driver start-up on power8"
Tested-by: David Bond <dbond@...e.com>
Signed-off-by: Martin Wilck <mwilck@...e.com>
Cc: stable@...r.kernel.org # 4.17.x
Cc: stable@...r.kernel.org # 4.18.x
Cc: stable@...r.kernel.org # 4.19.x
Reviewed-by: Hannes Reinecke <hare@...e.com>
Acked-by: James Smart <jsmart2021@...il.com>
Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/scsi/lpfc/lpfc_init.c |    6 +++++-
 drivers/scsi/lpfc/lpfc_sli.c  |    1 -
 2 files changed, 5 insertions(+), 2 deletions(-)

--- a/drivers/scsi/lpfc/lpfc_init.c
+++ b/drivers/scsi/lpfc/lpfc_init.c
@@ -167,7 +167,11 @@ lpfc_config_port_prep(struct lpfc_hba *p
 		       sizeof(phba->wwpn));
 	}

-	phba->sli3_options = 0x0;
+	/*
+	 * Clear all option bits except LPFC_SLI3_BG_ENABLED,
+	 * which was already set in lpfc_get_cfgparam()
+	 */
+	phba->sli3_options &= (uint32_t)LPFC_SLI3_BG_ENABLED;

 	/* Setup and issue mailbox READ REV command */
 	lpfc_read_rev(phba, pmb);
--- a/drivers/scsi/lpfc/lpfc_sli.c
+++ b/drivers/scsi/lpfc/lpfc_sli.c
@@ -4969,7 +4969,6 @@ lpfc_sli_config_port(struct lpfc_hba *ph
 		phba->sli3_options &= ~(LPFC_SLI3_NPIV_ENABLED |
 					LPFC_SLI3_HBQ_ENABLED |
 					LPFC_SLI3_CRP_ENABLED |
-					LPFC_SLI3_BG_ENABLED |
 					LPFC_SLI3_DSS_ENABLED);
 		if (rc != MBX_SUCCESS) {
 			lpfc_printf_log(phba, KERN_ERR, LOG_INIT,