Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/drivers/dma/bcm-sba-raid.c b/drivers/dma/bcm-sba-raid.c
index 72878ac..275e90f 100644
--- a/drivers/dma/bcm-sba-raid.c
+++ b/drivers/dma/bcm-sba-raid.c
@@ -164,7 +164,6 @@
 	struct list_head reqs_free_list;
 	/* DebugFS directory entries */
 	struct dentry *root;
-	struct dentry *stats;
 };
 
 /* ====== Command helper routines ===== */
@@ -1459,8 +1458,7 @@
 
 static int sba_debugfs_stats_show(struct seq_file *file, void *offset)
 {
-	struct platform_device *pdev = to_platform_device(file->private);
-	struct sba_device *sba = platform_get_drvdata(pdev);
+	struct sba_device *sba = dev_get_drvdata(file->private);
 
 	/* Write stats in file */
 	sba_write_stats_in_seqfile(sba, file);
@@ -1717,17 +1715,11 @@
 
 	/* Create debugfs root entry */
 	sba->root = debugfs_create_dir(dev_name(sba->dev), NULL);
-	if (IS_ERR_OR_NULL(sba->root)) {
-		dev_err(sba->dev, "failed to create debugfs root entry\n");
-		sba->root = NULL;
-		goto skip_debugfs;
-	}
 
 	/* Create debugfs stats entry */
-	sba->stats = debugfs_create_devm_seqfile(sba->dev, "stats", sba->root,
-						 sba_debugfs_stats_show);
-	if (IS_ERR_OR_NULL(sba->stats))
-		dev_err(sba->dev, "failed to create debugfs stats file\n");
+	debugfs_create_devm_seqfile(sba->dev, "stats", sba->root,
+				    sba_debugfs_stats_show);
+
 skip_debugfs:
 
 	/* Register DMA device with Linux async framework */