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authorMark Brown <broonie@opensource.wolfsonmicro.com>2012-07-05 20:23:21 +0000
committerTheodore Ts'o <tytso@mit.edu>2012-07-19 10:38:31 -0400
commit27130f0cc3ab97560384da437e4621fc4e94f21c (patch)
tree9570e047ca81c21252501ab5d3494b3160902289 /drivers/mfd
parent9dccf55f4cb011a7552a8a2749a580662f5ed8ed (diff)
downloadblackbird-op-linux-27130f0cc3ab97560384da437e4621fc4e94f21c.tar.gz
blackbird-op-linux-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.c8
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;
}
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