linux-kernel - [PATCH 5.15 777/779] scsi: lpfc: Fix locking for lpfc_sli_iocbq

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Date:   Mon, 15 Aug 2022 20:07:01 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Dick Kennedy <dick.kennedy@...adcom.com>,
        James Smart <jsmart2021@...il.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>
Subject: [PATCH 5.15 777/779] scsi: lpfc: Fix locking for lpfc_sli_iocbq_lookup()

From: James Smart <jsmart2021@...il.com>

commit c26bd6602e1d348bfa754dc55e5608c922dd2801 upstream.

The rules changed for lpfc_sli_iocbq_lookup() vs locking. Prior, the
routine properly took out the lock. In newly refactored code, the locks
must be held when calling the routine.

Fix lpfc_sli_process_sol_iocb() to take the locks before calling the
routine.

Fix lpfc_sli_handle_fast_ring_event() to not release the locks to call the
routine.

Link: https://lore.kernel.org/r/20220323205545.81814-3-jsmart2021@gmail.com
Fixes: 1b64aa9eae28 ("scsi: lpfc: SLI path split: Refactor fast and slow paths to native SLI4")
Co-developed-by: Dick Kennedy <dick.kennedy@...adcom.com>
Signed-off-by: Dick Kennedy <dick.kennedy@...adcom.com>
Signed-off-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_sli.c |   10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

--- a/drivers/scsi/lpfc/lpfc_sli.c
+++ b/drivers/scsi/lpfc/lpfc_sli.c
@@ -3642,7 +3642,15 @@ lpfc_sli_process_sol_iocb(struct lpfc_hb
 	unsigned long iflag;
 	u32 ulp_command, ulp_status, ulp_word4, ulp_context, iotag;
 
+	if (phba->sli_rev == LPFC_SLI_REV4)
+		spin_lock_irqsave(&pring->ring_lock, iflag);
+	else
+		spin_lock_irqsave(&phba->hbalock, iflag);
 	cmdiocbp = lpfc_sli_iocbq_lookup(phba, pring, saveq);
+	if (phba->sli_rev == LPFC_SLI_REV4)
+		spin_unlock_irqrestore(&pring->ring_lock, iflag);
+	else
+		spin_unlock_irqrestore(&phba->hbalock, iflag);
 
 	ulp_command = get_job_cmnd(phba, saveq);
 	ulp_status = get_job_ulpstatus(phba, saveq);
@@ -3979,10 +3987,8 @@ lpfc_sli_handle_fast_ring_event(struct l
 				break;
 			}
 
-			spin_unlock_irqrestore(&phba->hbalock, iflag);
 			cmdiocbq = lpfc_sli_iocbq_lookup(phba, pring,
 							 &rspiocbq);
-			spin_lock_irqsave(&phba->hbalock, iflag);
 			if (unlikely(!cmdiocbq))
 				break;
 			if (cmdiocbq->cmd_flag & LPFC_DRIVER_ABORTED)