linux-kernel - [PATCH 5.1 364/405] scsi: lpfc: Fix io lost on host resets

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Message-Id: <20190530030559.015596636@linuxfoundation.org>
Date:   Wed, 29 May 2019 20:06:02 -0700
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>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.1 364/405] scsi: lpfc: Fix io lost on host resets

[ Upstream commit c66a91974634bfdf9d8e8736219d3b27621fa704 ]

If the driver undergoes repeated host resets it starts losing exchange
structures and eventually returns SCSI_MLQUEUE_HOST_BUSY and does not
recover. The offline path is not reclaiming the outstanding ios on the fcp
pring txcmplq before calling lpfc_destroy_multixripool, which causes the
txmcplq to be reinit and the resources lost.

Flush the fcp rings before destroying the multixripools.

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: Sasha Levin <sashal@...nel.org>
---
 drivers/scsi/lpfc/lpfc_init.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/scsi/lpfc/lpfc_init.c b/drivers/scsi/lpfc/lpfc_init.c
index 7fcdaed3fa945..89a0c2bdb6a15 100644
--- a/drivers/scsi/lpfc/lpfc_init.c
+++ b/drivers/scsi/lpfc/lpfc_init.c
@@ -3245,6 +3245,13 @@ void lpfc_destroy_multixri_pools(struct lpfc_hba *phba)
 	if (phba->cfg_enable_fc4_type & LPFC_ENABLE_NVME)
 		lpfc_destroy_expedite_pool(phba);
 
+	if (!(phba->pport->load_flag & FC_UNLOADING)) {
+		lpfc_sli_flush_fcp_rings(phba);
+
+		if (phba->cfg_enable_fc4_type & LPFC_ENABLE_NVME)
+			lpfc_sli_flush_nvme_rings(phba);
+	}
+
 	hwq_count = phba->cfg_hdw_queue;
 
 	for (i = 0; i < hwq_count; i++) {
-- 
2.20.1