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    Subject[ 04/68] drm/radeon: only add the mm i2c bus if the hw_i2c module param is set
    3.2-stable review patch.  If anyone has any objections, please let me know.

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

    From: Alex Deucher <alexander.deucher@amd.com>

    commit 46783150a6552f9513f08e62cfcc07125d6e502b upstream.

    It seems it can corrupt the monitor EDID in certain cases on certain
    boards when running sensors detect. It's rarely used anyway outside
    of AIW boards.

    http://lists.lm-sensors.org/pipermail/lm-sensors/2012-April/035847.html
    http://lists.freedesktop.org/archives/xorg/2011-January/052239.html

    Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
    Acked-by: Jean Delvare <khali@linux-fr.org>
    Signed-off-by: Dave Airlie <airlied@redhat.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    drivers/gpu/drm/radeon/radeon_i2c.c | 4 ++++
    1 file changed, 4 insertions(+)

    --- a/drivers/gpu/drm/radeon/radeon_i2c.c
    +++ b/drivers/gpu/drm/radeon/radeon_i2c.c
    @@ -890,6 +890,10 @@ struct radeon_i2c_chan *radeon_i2c_creat
    struct radeon_i2c_chan *i2c;
    int ret;

    + /* don't add the mm_i2c bus unless hw_i2c is enabled */
    + if (rec->mm_i2c && (radeon_hw_i2c == 0))
    + return NULL;
    +
    i2c = kzalloc(sizeof(struct radeon_i2c_chan), GFP_KERNEL);
    if (i2c == NULL)
    return NULL;



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