From 85a7254326c57d36ad27bf4f60dcde9ea026942f Mon Sep 17 00:00:00 2001
From: Benjamin Valentin <benpicco@googlemail.com>
Date: Sat, 2 May 2020 22:06:38 +0200
Subject: [PATCH] pkg/littlefs: init MTD device before accessing it's
 parameters

The parameters of the MTD device (`sector_count`, `page_size`)
are only known after the device has been initialized.

Init the device before using it to avoid reading all 0 on e.g. SD cards.
---
 pkg/littlefs/fs/littlefs_fs.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/pkg/littlefs/fs/littlefs_fs.c b/pkg/littlefs/fs/littlefs_fs.c
index 0d7d61294f..8738aa57ea 100644
--- a/pkg/littlefs/fs/littlefs_fs.c
+++ b/pkg/littlefs/fs/littlefs_fs.c
@@ -132,6 +132,12 @@ static int prepare(littlefs_desc_t *fs)
     mutex_init(&fs->lock);
     mutex_lock(&fs->lock);
 
+    int ret = mtd_init(fs->dev);
+
+    if (ret) {
+        return ret;
+    }
+
     memset(&fs->fs, 0, sizeof(fs->fs));
 
     if (!fs->config.block_count) {
@@ -163,7 +169,7 @@ static int prepare(littlefs_desc_t *fs)
     fs->config.prog_buffer = fs->prog_buf;
 #endif
 
-    return mtd_init(fs->dev);
+    return 0;
 }
 
 static int _format(vfs_mount_t *mountp)