From: Philipp Zabel Date: Fri, 16 May 2014 14:25:34 +0000 (+0200) Subject: regmap: mmio: Fix regmap_mmio_write for uneven counts X-Git-Tag: firefly_0821_release~176^2~3465^2~33^2~2^2 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=2e804b7c72d4efd2318428a2c1e40fd0e173c487;p=firefly-linux-kernel-4.4.55.git 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 Signed-off-by: Mark Brown --- diff --git a/drivers/base/regmap/regmap-mmio.c b/drivers/base/regmap/regmap-mmio.c index 1e03e7f8bacb..902c4fb5c760 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, @@ -120,7 +120,7 @@ static int regmap_mmio_write(void *context, const void *data, size_t count) struct regmap_mmio_context *ctx = context; u32 offset = ctx->reg_bytes + ctx->pad_bytes; - regmap_mmio_count_check(count); + regmap_mmio_count_check(count, offset); return regmap_mmio_gather_write(context, data, ctx->reg_bytes, data + offset, count - offset);