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iio: magnetometer: ak8974: add_device_randomness (serial number)

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Mix device-specific data into randomness pool.

Signed-off-by: Michał Mirosław <[email protected]>
Reviewed-by: Linus Walleij <[email protected]>
Signed-off-by: Jonathan Cameron <[email protected]>
This commit is contained in:
Michał Mirosław 2017-08-17 15:56:11 +02:00 • committed by Jonathan Cameron
commit 408cc6eb1e
1 changed files with 2 additions and 0 deletions
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2
drivers/iio/magnetometer/ak8974.c
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@ -20,6 +20,7 @@
#include <linux/mutex.h>
#include <linux/delay.h>
#include <linux/bitops.h>
#include <linux/random.h>
#include <linux/regmap.h>
#include <linux/regulator/consumer.h>
#include <linux/pm_runtime.h>
@ -470,6 +471,7 @@ static int ak8974_detect(struct ak8974 *ak8974)
ret = ak8974_get_u16_val(ak8974, AMI305_SN, &sn);
if (ret)
return ret;
add_device_randomness(&sn, sizeof(sn));
dev_info(&ak8974->i2c->dev,
"detected %s, FW ver %02x, S/N: %04x\n",
name, fw, sn);