linux-kernel - [PATCH 5.16 0893/1017] scsi: qla2xxx: Fix missed DMA unmap for NVMe ls requests

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Date:   Tue,  5 Apr 2022 09:30:06 +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,
        Himanshu Madhani <himanshu.madhani@...cle.com>,
        Arun Easi <aeasi@...vell.com>,
        Nilesh Javali <njavali@...vell.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>
Subject: [PATCH 5.16 0893/1017] scsi: qla2xxx: Fix missed DMA unmap for NVMe ls requests

From: Arun Easi <aeasi@...vell.com>

commit c85ab7d9e27a80e48d5b7d7fb2fe2b0fdb2de523 upstream.

At NVMe ELS request time, request structure is DMA mapped and never
unmapped. Fix this by calling the unmap on ELS completion.

Link: https://lore.kernel.org/r/20220310092604.22950-5-njavali@marvell.com
Fixes: e84067d74301 ("scsi: qla2xxx: Add FC-NVMe F/W initialization and transport registration")
Cc: stable@...r.kernel.org
Reviewed-by: Himanshu Madhani <himanshu.madhani@...cle.com>
Signed-off-by: Arun Easi <aeasi@...vell.com>
Signed-off-by: Nilesh Javali <njavali@...vell.com>
Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/scsi/qla2xxx/qla_nvme.c |   17 +++++++++++++++++
 1 file changed, 17 insertions(+)

--- a/drivers/scsi/qla2xxx/qla_nvme.c
+++ b/drivers/scsi/qla2xxx/qla_nvme.c
@@ -172,6 +172,18 @@ out:
 	qla2xxx_rel_qpair_sp(sp->qpair, sp);
 }
 
+static void qla_nvme_ls_unmap(struct srb *sp, struct nvmefc_ls_req *fd)
+{
+	if (sp->flags & SRB_DMA_VALID) {
+		struct srb_iocb *nvme = &sp->u.iocb_cmd;
+		struct qla_hw_data *ha = sp->fcport->vha->hw;
+
+		dma_unmap_single(&ha->pdev->dev, nvme->u.nvme.cmd_dma,
+				 fd->rqstlen, DMA_TO_DEVICE);
+		sp->flags &= ~SRB_DMA_VALID;
+	}
+}
+
 static void qla_nvme_release_ls_cmd_kref(struct kref *kref)
 {
 	struct srb *sp = container_of(kref, struct srb, cmd_kref);
@@ -188,6 +200,8 @@ static void qla_nvme_release_ls_cmd_kref
 	spin_unlock_irqrestore(&priv->cmd_lock, flags);
 
 	fd = priv->fd;
+
+	qla_nvme_ls_unmap(sp, fd);
 	fd->done(fd, priv->comp_status);
 out:
 	qla2x00_rel_sp(sp);
@@ -358,6 +372,8 @@ static int qla_nvme_ls_req(struct nvme_f
 	dma_sync_single_for_device(&ha->pdev->dev, nvme->u.nvme.cmd_dma,
 	    fd->rqstlen, DMA_TO_DEVICE);
 
+	sp->flags |= SRB_DMA_VALID;
+
 	rval = qla2x00_start_sp(sp);
 	if (rval != QLA_SUCCESS) {
 		ql_log(ql_log_warn, vha, 0x700e,
@@ -365,6 +381,7 @@ static int qla_nvme_ls_req(struct nvme_f
 		wake_up(&sp->nvme_ls_waitq);
 		sp->priv = NULL;
 		priv->sp = NULL;
+		qla_nvme_ls_unmap(sp, fd);
 		qla2x00_rel_sp(sp);
 		return rval;
 	}