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Commit 27130f0c authored by Mark Brown's avatar Mark Brown Committed by Theodore Ts'o
Browse files

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: default avatarMark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: default avatarTheodore Ts'o <tytso@mit.edu>
Cc: stable@vger.kernel.org
parent 9dccf55f

drivers/mfd/wm831x-otp.c

+8 −0
Original line number Original line Diff line number Diff line
@@ -18,6 +18,7 @@ 
#include <linux/bcd.h>

#include <linux/bcd.h>

#include <linux/delay.h>

#include <linux/delay.h>

#include <linux/mfd/core.h>

#include <linux/mfd/core.h>

#include <linux/random.h>





#include <linux/mfd/wm831x/core.h>

#include <linux/mfd/wm831x/core.h>

#include <linux/mfd/wm831x/otp.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)

int wm831x_otp_init(struct wm831x *wm831x)

{

{

	char uuid[WM831X_UNIQUE_ID_LEN];

	int ret;

	int ret;





	ret = device_create_file(wm831x->dev, &dev_attr_unique_id);

	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",

		dev_err(wm831x->dev, "Unique ID attribute not created: %d\n",

			ret);

			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;

	return ret;

}

}