linux-kernel - [PATCH v3] RAS: Fix return value from show

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Message-Id: <20221018165900.109029-1-tony.luck@intel.com>
Date:   Tue, 18 Oct 2022 09:59:00 -0700
From:   Tony Luck <tony.luck@...el.com>
To:     Borislav Petkov <bp@...en8.de>
Cc:     x86@...nel.org, linux-kernel@...r.kernel.org,
        Tony Luck <tony.luck@...el.com>
Subject: [PATCH v3] RAS: Fix return value from show_trace()

Documentation/filesystems/seq_file.rst describes the possible return
values from a "show()" function used by single_open().

show_trace() returns the value of "trace_count" this could be interpreted
as "SEQ_SKIP", or just confuse the calling function.

Change to just return "0" to avoid confusing anyone reading this code
and possibly using as a template. Reading "daemon_active" was never
an intended use case.

Signed-off-by: Tony Luck <tony.luck@...el.com>

---
V3: Boris: "let's keep this effort minimal and only address valid use
cases"
---
 drivers/ras/debugfs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/ras/debugfs.c b/drivers/ras/debugfs.c
index 0d4f985afbf3..f0a6391b1146 100644
--- a/drivers/ras/debugfs.c
+++ b/drivers/ras/debugfs.c
@@ -15,7 +15,7 @@ EXPORT_SYMBOL_GPL(ras_userspace_consumers);

 static int trace_show(struct seq_file *m, void *v)
 {
-	return atomic_read(&trace_count);
+	return 0;
 }

 static int trace_open(struct inode *inode, struct file *file)
-- 
2.37.3