linux-kernel - [PATCH] mmc: Fix error checking

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Date:   Thu, 18 May 2023 00:46:28 +0800
From:   Yeqi Fu <asuk4.q@...il.com>
To:     ulf.hansson@...aro.org, CLoehle@...erstone.com
Cc:     Yeqi Fu <asuk4.q@...il.com>, linux-mmc@...r.kernel.org,
        linux-kernel@...r.kernel.org, Ivan Orlov <ivan.orlov0322@...il.com>
Subject: [PATCH] mmc: Fix error checking

The functions debugfs_create_dir and debugfs_create_file_unsafe return
ERR_PTR if an error occurs, and the appropriate way to verify for errors
is to use the inline function IS_ERR. The patch will substitute the
null-comparison with IS_ERR.

Signed-off-by: Yeqi Fu <asuk4.q@...il.com>
Suggested-by: Ivan Orlov <ivan.orlov0322@...il.com>
---
 drivers/mmc/core/block.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/mmc/core/block.c b/drivers/mmc/core/block.c
index 00c33edb9fb9..507bebc22636 100644
--- a/drivers/mmc/core/block.c
+++ b/drivers/mmc/core/block.c
@@ -2908,7 +2908,7 @@ static int mmc_blk_add_debugfs(struct mmc_card *card, struct mmc_blk_data *md)
 			debugfs_create_file_unsafe("status", 0400, root,
 						   card,
 						   &mmc_dbg_card_status_fops);
-		if (!md->status_dentry)
+		if (IS_ERR(md->status_dentry))
 			return -EIO;
 	}
 
@@ -2916,7 +2916,7 @@ static int mmc_blk_add_debugfs(struct mmc_card *card, struct mmc_blk_data *md)
 		md->ext_csd_dentry =
 			debugfs_create_file("ext_csd", S_IRUSR, root, card,
 					    &mmc_dbg_ext_csd_fops);
-		if (!md->ext_csd_dentry)
+		if (IS_ERR(md->ext_csd_dentry))
 			return -EIO;
 	}
 
-- 
2.37.2