@@ -507,16 +508,17 @@ static int hwrng_fillfn(void *unused)
rng->quality = current_quality; /* obsolete */
quality = rng->quality;
mutex_unlock(&reading_mutex);
+
+ if (rc <= 0)
+ hwrng_msleep(rng, 10000);
+
put_rng(rng);
if (!quality)
break;
- if (rc <= 0) {
- pr_warn("hwrng: no data available\n");
- msleep_interruptible(10000);
+ if (rc <= 0)
continue;
- }
/* If we cannot credit at least one bit of entropy,
* keep track of the remainder for the next iteration
@@ -570,6 +572,7 @@ int hwrng_register(struct hwrng *rng)
init_completion(&rng->cleanup_done);
complete(&rng->cleanup_done);
+ init_completion(&rng->dying);
if (!current_rng ||
(!cur_rng_set_by_user && rng->quality > current_rng->quality)) {
@@ -617,6 +620,7 @@ void hwrng_unregister(struct hwrng *rng)
old_rng = current_rng;
list_del(&rng->list);
+ complete_all(&rng->dying);
if (current_rng == rng) {
err = enable_best_rng();
if (err) {
@@ -685,6 +689,14 @@ void devm_hwrng_unregister(struct device *dev, struct hwrng *rng)
}
EXPORT_SYMBOL_GPL(devm_hwrng_unregister);
+long hwrng_msleep(struct hwrng *rng, unsigned int msecs)
+{
+ unsigned long timeout = msecs_to_jiffies(msecs) + 1;
+
+ return wait_for_completion_interruptible_timeout(&rng->dying, timeout);
+}
+EXPORT_SYMBOL_GPL(hwrng_msleep);
+
static int __init hwrng_modinit(void)
{
int ret;
@@ -83,7 +83,8 @@ static int ath9k_rng_read(struct hwrng *rng, void *buf, size_t max, bool wait)
if (!wait || !max || likely(bytes_read) || fail_stats > 110)
break;
- msleep_interruptible(ath9k_rng_delay_get(++fail_stats));
+ if (hwrng_msleep(rng, ath9k_rng_delay_get(++fail_stats)))
+ break;
}
if (wait && !bytes_read && max)
@@ -50,6 +50,7 @@ struct hwrng {
struct list_head list;
struct kref ref;
struct completion cleanup_done;
+ struct completion dying;
};
struct device;
@@ -61,4 +62,6 @@ extern int devm_hwrng_register(struct device *dev, struct hwrng *rng);
extern void hwrng_unregister(struct hwrng *rng);
extern void devm_hwrng_unregister(struct device *dve, struct hwrng *rng);
+extern long hwrng_msleep(struct hwrng *rng, unsigned int msecs);
+
#endif /* LINUX_HWRANDOM_H_ */