linux-kernel - [PATCH 4.20 02/65] scsi: lpfc: do not set queue->page_count to 0 if pc_sli4

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Date:   Fri, 11 Jan 2019 15:14:48 +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, "Ewan D. Milne" <emilne@...hat.com>,
        Laurence Oberman <loberman@...hat.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>
Subject: [PATCH 4.20 02/65] scsi: lpfc: do not set queue->page_count to 0 if pc_sli4_params.wqpcnt is invalid

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

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

From: Ewan D. Milne <emilne@...hat.com>

commit 4e87eb2f46ea547d12a276b2e696ab934d16cfb6 upstream.

Certain older adapters such as the OneConnect OCe10100 may not have a valid
wqpcnt value.  In this case, do not set queue->page_count to 0 in
lpfc_sli4_queue_alloc() as this will prevent the driver from initializing.

Fixes: 895427bd01 ("scsi: lpfc: NVME Initiator: Base modifications")
Cc: stable@...r.kernel.org # 4.11+
Signed-off-by: Ewan D. Milne <emilne@...hat.com>
Reviewed-by: Laurence Oberman <loberman@...hat.com>
Tested-by:   Laurence Oberman <loberman@...hat.com>
Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/scsi/lpfc/lpfc_sli.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/scsi/lpfc/lpfc_sli.c
+++ b/drivers/scsi/lpfc/lpfc_sli.c
@@ -14501,7 +14501,8 @@ lpfc_sli4_queue_alloc(struct lpfc_hba *p
 			hw_page_size))/hw_page_size;

 	/* If needed, Adjust page count to match the max the adapter supports */
-	if (queue->page_count > phba->sli4_hba.pc_sli4_params.wqpcnt)
+	if (phba->sli4_hba.pc_sli4_params.wqpcnt &&
+	    (queue->page_count > phba->sli4_hba.pc_sli4_params.wqpcnt))
 		queue->page_count = phba->sli4_hba.pc_sli4_params.wqpcnt;

 	INIT_LIST_HEAD(&queue->list);