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mfd: wm831x: Feed the device UUID into device_add_randomness() 

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>
Cc: stable@vger.kernel.org
This commit is contained in:
Mark Brown 2012-07-05 20:23:21 +00:00 committed by Theodore Ts'o
parent 9dccf55f4c
commit 27130f0cc3
1 changed files with 8 additions and 0 deletions
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8
drivers/mfd/wm831x-otp.c
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@ -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, wm831x_unique_id_show, NULL);
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 *wm831x)
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;
}