linux-kernel - [PATCH] regmap: mmio: Fix regmap_mmio

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Message-Id: <1400247809-17645-1-git-send-email-p.zabel@pengutronix.de>
Date:	Fri, 16 May 2014 15:43:29 +0200
From:	Philipp Zabel <p.zabel@...gutronix.de>
To:	Mark Brown <broonie@...nel.org>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-kernel@...r.kernel.org, kernel@...gutronix.de,
	Philipp Zabel <p.zabel@...gutronix.de>
Subject: [PATCH] regmap: mmio: Fix regmap_mmio_write for uneven counts

Commit 932580409a9dacbf42215fa737bf06ae2c0aa624
"regmap: mmio: Add support for 1/2/8 bytes wide register address."
broke regmap_mmio_write for uneven counts, for example 32-bit register
addresses with no padding and 8-byte values (count = 5).
Fix this by allowing all counts large enough to include some value.
This check was BUG_ON(count < 4) before the last change.

Signed-off-by: Philipp Zabel <p.zabel@...gutronix.de>
---
 drivers/base/regmap/regmap-mmio.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/base/regmap/regmap-mmio.c b/drivers/base/regmap/regmap-mmio.c
index 1e03e7f..4f5725f 100644
--- a/drivers/base/regmap/regmap-mmio.c
+++ b/drivers/base/regmap/regmap-mmio.c
@@ -61,9 +61,9 @@ static int regmap_mmio_regbits_check(size_t reg_bits)
 	}
 }
 
-static inline void regmap_mmio_count_check(size_t count)
+static inline void regmap_mmio_count_check(size_t count, u32 offset)
 {
-	BUG_ON(count % 2 != 0);
+	BUG_ON(count <= offset);
 }
 
 static int regmap_mmio_gather_write(void *context,
-- 
2.0.0.rc0

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