linux-kernel - Applied "regmap: debugfs: Don't bother actually printing when calculating max length" to the regmap tree

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Date:	Sat, 19 Sep 2015 17:13:08 -0700
From:	Mark Brown <broonie@...nel.org>
To:	Rasmus Villemoes <linux@...musvillemoes.dk>,
	Mark Brown <broonie@...nel.org>, stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org
Subject: Applied "regmap: debugfs: Don't bother actually printing when calculating max length" to the regmap tree

The patch

   regmap: debugfs: Don't bother actually printing when calculating max length

has been applied to the regmap tree at

   git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regmap.git 

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.  

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark

>From 176fc2d5770a0990eebff903ba680d2edd32e718 Mon Sep 17 00:00:00 2001
From: Mark Brown <broonie@...nel.org>
Date: Sat, 19 Sep 2015 07:12:34 -0700
Subject: [PATCH] regmap: debugfs: Don't bother actually printing when
 calculating max length

The in kernel snprintf() will conveniently return the actual length of
the printed string even if not given an output beffer at all so just do
that rather than relying on the user to pass in a suitable buffer,
ensuring that we don't need to worry if the buffer was truncated due to
the size of the buffer passed in.

Reported-by: Rasmus Villemoes <linux@...musvillemoes.dk>
Signed-off-by: Mark Brown <broonie@...nel.org>
Cc: stable@...r.kernel.org
---
 drivers/base/regmap/regmap-debugfs.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/base/regmap/regmap-debugfs.c b/drivers/base/regmap/regmap-debugfs.c
index 1f32789..4c55cfb 100644
--- a/drivers/base/regmap/regmap-debugfs.c
+++ b/drivers/base/regmap/regmap-debugfs.c
@@ -32,8 +32,7 @@ static DEFINE_MUTEX(regmap_debugfs_early_lock);
 /* Calculate the length of a fixed format  */
 static size_t regmap_calc_reg_len(int max_val, char *buf, size_t buf_size)
 {
-	snprintf(buf, buf_size, "%x", max_val);
-	return strlen(buf);
+	return snprintf(NULL, 0, "%x", max_val);
 }

 static ssize_t regmap_name_read_file(struct file *file,
-- 
2.5.0

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