linux-kernel - [PATCH 6/7] debugfs: Fix misuse of seq

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Date:	Mon, 29 Sep 2014 16:08:26 -0700
From:	Joe Perches <joe@...ches.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Al Viro <viro@...IV.linux.org.uk>, Petr Mladek <pmladek@...e.cz>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 6/7] debugfs: Fix misuse of seq_printf return value

Adding repeated -1 to the return is not correct.

Use seq_is_full to test for unnecessary seq_printf uses
and always return 0.

Signed-off-by: Joe Perches <joe@...ches.com>
---
 fs/debugfs/file.c | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/fs/debugfs/file.c b/fs/debugfs/file.c
index 76c08c2..c24e578 100644
--- a/fs/debugfs/file.c
+++ b/fs/debugfs/file.c
@@ -695,15 +695,17 @@ EXPORT_SYMBOL_GPL(debugfs_create_u32_array);
 int debugfs_print_regs32(struct seq_file *s, const struct debugfs_reg32 *regs,
 			   int nregs, void __iomem *base, char *prefix)
 {
-	int i, ret = 0;
+	int i;
 
 	for (i = 0; i < nregs; i++, regs++) {
-		if (prefix)
-			ret += seq_printf(s, "%s", prefix);
-		ret += seq_printf(s, "%s = 0x%08x\n", regs->name,
-				  readl(base + regs->offset));
+		seq_printf(s, "%s%s = 0x%08x\n",
+			   prefix ? prefix : "",
+			   regs->name, readl(base + regs->offset));
+		if (seq_is_full(s))
+			break;
 	}
-	return ret;
+
+	return 0;
 }
 EXPORT_SYMBOL_GPL(debugfs_print_regs32);
 
-- 
1.8.1.2.459.gbcd45b4.dirty

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