linux-kernel - [PATCH v2] scsi: megaraid_sas: Fix debugfs error checking

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Message-ID: <20251120032048.572-1-vulab@iscas.ac.cn>
Date: Thu, 20 Nov 2025 11:20:47 +0800
From: Haotian Zhang <vulab@...as.ac.cn>
To: martin.petersen@...cle.com
Cc: kashyap.desai@...adcom.com,
	sumit.saxena@...adcom.com,
	shivasharan.srikanteshwara@...adcom.com,
	chandrakanth.patil@...adcom.com,
	James.Bottomley@...senPartnership.com,
	megaraidlinux.pdl@...adcom.com,
	linux-scsi@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Haotian Zhang <vulab@...as.ac.cn>
Subject: [PATCH v2] scsi: megaraid_sas: Fix debugfs error checking

The debugfs_create_dir() and debugfs_create_file() functions return
ERR_PTR() on error, not NULL. The current null-checks fail to detect
errors because ERR_PTR() encodes error codes as non-null pointer values.

Replace the null-checks with IS_ERR() for debugfs_create_dir() and
debugfs_create_file() calls to properly handle errors.

Fixes: ba53572bf02d ("scsi: megaraid_sas: Export RAID map through debugfs")
Signed-off-by: Haotian Zhang <vulab@...as.ac.cn>
---
Changes in v2:
  -Also fix the check in megasas_init_debugfs().
---
 drivers/scsi/megaraid/megaraid_sas_debugfs.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/scsi/megaraid/megaraid_sas_debugfs.c b/drivers/scsi/megaraid/megaraid_sas_debugfs.c
index c69760775efa..e2ed771df549 100644
--- a/drivers/scsi/megaraid/megaraid_sas_debugfs.c
+++ b/drivers/scsi/megaraid/megaraid_sas_debugfs.c
@@ -102,7 +102,7 @@ static const struct file_operations megasas_debugfs_raidmap_fops = {
 void megasas_init_debugfs(void)
 {
 	megasas_debugfs_root = debugfs_create_dir("megaraid_sas", NULL);
-	if (!megasas_debugfs_root)
+	if (IS_ERR(megasas_debugfs_root))
 		pr_info("Cannot create debugfs root\n");
 }
 
@@ -132,7 +132,7 @@ megasas_setup_debugfs(struct megasas_instance *instance)
 		if (!instance->debugfs_root) {
 			instance->debugfs_root =
 				debugfs_create_dir(name, megasas_debugfs_root);
-			if (!instance->debugfs_root) {
+			if (IS_ERR(instance->debugfs_root)) {
 				dev_err(&instance->pdev->dev,
 					"Cannot create per adapter debugfs directory\n");
 				return;
@@ -144,7 +144,7 @@ megasas_setup_debugfs(struct megasas_instance *instance)
 			debugfs_create_file(name, S_IRUGO,
 					    instance->debugfs_root, instance,
 					    &megasas_debugfs_raidmap_fops);
-		if (!instance->raidmap_dump) {
+		if (IS_ERR(instance->raidmap_dump)) {
 			dev_err(&instance->pdev->dev,
 				"Cannot create raidmap debugfs file\n");
 			debugfs_remove(instance->debugfs_root);
-- 
2.50.1.windows.1