FAILED: patch "[PATCH] scsi: qla2xxx: Fix missed DMA unmap for NVMe ls requests" failed to apply to 4.19-stable tree

[<gregkh@linuxfoundation.org>]

The patch below does not apply to the 4.19-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@vger.kernel.org>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From c85ab7d9e27a80e48d5b7d7fb2fe2b0fdb2de523 Mon Sep 17 00:00:00 2001
From: Arun Easi <aeasi@marvell.com>
Date: Thu, 10 Mar 2022 01:25:55 -0800
Subject: [PATCH] scsi: qla2xxx: Fix missed DMA unmap for NVMe ls requests

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@vger.kernel.org
Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>
Signed-off-by: Arun Easi <aeasi@marvell.com>
Signed-off-by: Nilesh Javali <njavali@marvell.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

diff --git a/drivers/scsi/qla2xxx/qla_nvme.c b/drivers/scsi/qla2xxx/qla_nvme.c
index 3bf5cbd754a7..794a95b2e3b4 100644
--- a/drivers/scsi/qla2xxx/qla_nvme.c
+++ b/drivers/scsi/qla2xxx/qla_nvme.c
@@ -175,6 +175,18 @@ static void qla_nvme_release_fcp_cmd_kref(struct kref *kref)
 	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);
@@ -191,6 +203,8 @@ static void qla_nvme_release_ls_cmd_kref(struct kref *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);
@@ -361,6 +375,8 @@ static int qla_nvme_ls_req(struct nvme_fc_local_port *lport,
 	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,
@@ -368,6 +384,7 @@ static int qla_nvme_ls_req(struct nvme_fc_local_port *lport,
 		wake_up(&sp->nvme_ls_waitq);
 		sp->priv = NULL;
 		priv->sp = NULL;
+		qla_nvme_ls_unmap(sp, fd);
 		qla2x00_rel_sp(sp);
 		return rval;
 	}