regmap: Fix possible shift overflow in regmap_field_init()

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[ Upstream commit 921cc29473 ]

The way the mask is generated in regmap_field_init() is wrong.
Indeed, a field initialized with msb = 31 and lsb = 0 provokes a shift
overflow while calculating the mask field.

On some 32 bits architectures, such as x86, the generated mask is 0,
instead of the expected 0xffffffff.

This patch uses GENMASK() to fix the problem, as this macro is already safe
regarding shift overflow.

Signed-off-by: Maxime Coquelin <maxime.coquelin@st.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Cc: stable@vger.kernel.org
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>

...

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Maxime Coquelin 2015-06-16 13:53:19 +02:00 • committed by Sasha Levin

parent f099f4aaad

commit c00a686169

1 changed files with 1 additions and 2 deletions

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drivers/base/regmap/regmap.c

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