diff options
| author | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2012-07-05 20:23:21 +0000 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2012-07-19 10:38:31 -0400 |
| commit | 27130f0cc3ab97560384da437e4621fc4e94f21c (patch) | |
| tree | 9570e047ca81c21252501ab5d3494b3160902289 /drivers/mfd | |
| parent | 9dccf55f4cb011a7552a8a2749a580662f5ed8ed (diff) | |
| download | lwn-27130f0cc3ab97560384da437e4621fc4e94f21c.tar.gz lwn-27130f0cc3ab97560384da437e4621fc4e94f21c.zip | |
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
Diffstat (limited to 'drivers/mfd')
| -rw-r--r-- | drivers/mfd/wm831x-otp.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/mfd/wm831x-otp.c b/drivers/mfd/wm831x-otp.c index f742745ff354..b90f3e06b6c9 100644 --- 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, 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; } |