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    Subject[ 56/82] mfd: wm831x: Feed the device UUID into device_add_randomness()
    Date
    From: Greg KH <gregkh@linuxfoundation.org>

    3.5-stable review patch. If anyone has any objections, please let me know.

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

    From: Mark Brown <broonie@opensource.wolfsonmicro.com>

    commit 27130f0cc3ab97560384da437e4621fc4e94f21c upstream.

    wm831x devices contain a unique ID value. Feed this into the newly added
    device_add_randomness() to add some per device seed data to the pool.

    Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
    Signed-off-by: Theodore Ts'o <tytso@mit.edu>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    drivers/mfd/wm831x-otp.c | 8 ++++++++
    1 file changed, 8 insertions(+)

    --- a/drivers/mfd/wm831x-otp.c
    +++ b/drivers/mfd/wm831x-otp.c
    @@ -18,6 +18,7 @@
    #include <linux/bcd.h>
    #include <linux/delay.h>
    #include <linux/mfd/core.h>
    +#include <linux/random.h>

    #include <linux/mfd/wm831x/core.h>
    #include <linux/mfd/wm831x/otp.h>
    @@ -66,6 +67,7 @@ static DEVICE_ATTR(unique_id, 0444, wm83

    int wm831x_otp_init(struct wm831x *wm831x)
    {
    + char uuid[WM831X_UNIQUE_ID_LEN];
    int ret;

    ret = device_create_file(wm831x->dev, &dev_attr_unique_id);
    @@ -73,6 +75,12 @@ int wm831x_otp_init(struct wm831x *wm831
    dev_err(wm831x->dev, "Unique ID attribute not created: %d\n",
    ret);

    + ret = wm831x_unique_id_read(wm831x, uuid);
    + if (ret == 0)
    + add_device_randomness(uuid, sizeof(uuid));
    + else
    + dev_err(wm831x->dev, "Failed to read UUID: %d\n", ret);
    +
    return ret;
    }




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