From e663d2d8708cd77be1c03983c82474b0ea3a3114 Mon Sep 17 00:00:00 2001
From: xiaoguang_ma <xiaoguang_ma@zuiki.co.jp>
Date: Wed, 2 Nov 2022 15:27:41 +0900
Subject: [PATCH] bugfix: remove sdcard block dev may cause a constant loop.

---
 components/drivers/sdio/block_dev.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/components/drivers/sdio/block_dev.c b/components/drivers/sdio/block_dev.c
index c8bb2f7c68..522fa753db 100644
--- a/components/drivers/sdio/block_dev.c
+++ b/components/drivers/sdio/block_dev.c
@@ -505,6 +505,18 @@ void rt_mmcsd_blk_remove(struct rt_mmcsd_card *card)
     rt_list_t *l, *n;
     struct mmcsd_blk_device *blk_dev;
 
+    if(card == RT_NULL)
+    {
+        LOG_E("card is null!");
+        return;
+    }
+
+    if(rt_list_isempty(&card->blk_devices))
+    {
+        LOG_E("card blk_devices is empty!");
+        return;
+    }
+
     for (l = (&card->blk_devices)->next, n = l->next; l != &card->blk_devices; l = n, n=n->next)
     {
         blk_dev = (struct mmcsd_blk_device *)rt_list_entry(l, struct mmcsd_blk_device, list);
-- 
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