linux-kernel - [PATCH 3.16 005/366] regmap: Correct offset handling in regmap_volatile

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Date:   Sun, 14 Oct 2018 16:25:40 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org,
        "Charles Keepax" <ckeepax@...nsource.cirrus.com>,
        "Mark Brown" <broonie@...nel.org>
Subject: [PATCH 3.16 005/366] regmap: Correct offset handling in
 regmap_volatile_range

3.16.60-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Charles Keepax <ckeepax@...nsource.cirrus.com>

commit b8f9a03b741ddfdde4aa8b607fa7d88eb63a6338 upstream.

The current implementation is broken for regmaps that have a reg_stride,
since it doesn't take the stride into account. Correct this by using the
helper function to calculate the register offset.

Fixes: f01ee60fffa4 ("regmap: implement register striding")
Signed-off-by: Charles Keepax <ckeepax@...nsource.cirrus.com>
Signed-off-by: Mark Brown <broonie@...nel.org>
[bwh: Backported to 3.16: Use simple multiplication instead of
 regmap_get_offset()]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/base/regmap/regmap.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/base/regmap/regmap.c
+++ b/drivers/base/regmap/regmap.c
@@ -144,7 +144,7 @@ static bool regmap_volatile_range(struct
 	unsigned int i;
 
 	for (i = 0; i < num; i++)
-		if (!regmap_volatile(map, reg + i))
+		if (!regmap_volatile(map, reg + (i * map->reg_stride)))
 			return false;
 
 	return true;