linux-kernel - [PATCH v4 12/24] powerpc/secvar: Don't print error on ENOENT when reading variables

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Date:   Fri, 20 Jan 2023 18:42:54 +1100
From:   Andrew Donnellan <ajd@...ux.ibm.com>
To:     linuxppc-dev@...ts.ozlabs.org, linux-integrity@...r.kernel.org
Cc:     gregkh@...uxfoundation.org, gcwilson@...ux.ibm.com,
        linux-kernel@...r.kernel.org, nayna@...ux.ibm.com,
        ruscur@...sell.cc, zohar@...ux.ibm.com, mpe@...erman.id.au,
        gjoyce@...ux.ibm.com, sudhakar@...ux.ibm.com, bgray@...ux.ibm.com,
        erichte@...ux.ibm.com, joel@....id.au
Subject: [PATCH v4 12/24] powerpc/secvar: Don't print error on ENOENT when reading variables

If attempting to read the size or data attributes of a  non-existent
variable (which will be possible after a later patch to expose the PLPKS
via the secvar interface), don't spam the kernel log with error messages.
Only print errors for return codes that aren't ENOENT.

Reported-by: Sudhakar Kuppusamy <sudhakar@...ux.ibm.com>
Signed-off-by: Andrew Donnellan <ajd@...ux.ibm.com>

---

v3: New patch
---
 arch/powerpc/kernel/secvar-sysfs.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/arch/powerpc/kernel/secvar-sysfs.c b/arch/powerpc/kernel/secvar-sysfs.c
index 6dd9b4f6f87c..33d1797851ba 100644
--- a/arch/powerpc/kernel/secvar-sysfs.c
+++ b/arch/powerpc/kernel/secvar-sysfs.c
@@ -43,8 +43,8 @@ static ssize_t size_show(struct kobject *kobj, struct kobj_attribute *attr,
 
 	rc = secvar_ops->get(kobj->name, strlen(kobj->name) + 1, NULL, &dsize);
 	if (rc) {
-		pr_err("Error retrieving %s variable size %d\n", kobj->name,
-		       rc);
+		if (rc != -ENOENT)
+			pr_err("Error retrieving %s variable size %d\n", kobj->name, rc);
 		return rc;
 	}
 
@@ -61,7 +61,8 @@ static ssize_t data_read(struct file *filep, struct kobject *kobj,
 
 	rc = secvar_ops->get(kobj->name, strlen(kobj->name) + 1, NULL, &dsize);
 	if (rc) {
-		pr_err("Error getting %s variable size %d\n", kobj->name, rc);
+		if (rc != -ENOENT)
+			pr_err("Error getting %s variable size %d\n", kobj->name, rc);
 		return rc;
 	}
 	pr_debug("dsize is %llu\n", dsize);
-- 
2.39.0