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path: root/drivers/char/random.c
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Diffstat (limited to 'drivers/char/random.c')
-rw-r--r--drivers/char/random.c12
1 files changed, 6 insertions, 6 deletions
diff --git a/drivers/char/random.c b/drivers/char/random.c
index a8476154d47e..94990b052f58 100644
--- a/drivers/char/random.c
+++ b/drivers/char/random.c
@@ -727,7 +727,7 @@ static void __cold _credit_init_bits(size_t bits)
* the above entropy accumulation routines:
*
* void add_device_randomness(const void *buf, size_t len);
- * void add_hwgenerator_randomness(const void *buf, size_t len, size_t entropy);
+ * void add_hwgenerator_randomness(const void *buf, size_t len, size_t entropy, bool sleep_after);
* void add_bootloader_randomness(const void *buf, size_t len);
* void add_vmfork_randomness(const void *unique_vm_id, size_t len);
* void add_interrupt_randomness(int irq);
@@ -907,11 +907,11 @@ void add_device_randomness(const void *buf, size_t len)
EXPORT_SYMBOL(add_device_randomness);
/*
- * Interface for in-kernel drivers of true hardware RNGs.
- * Those devices may produce endless random bits and will be throttled
- * when our pool is full.
+ * Interface for in-kernel drivers of true hardware RNGs. Those devices
+ * may produce endless random bits, so this function will sleep for
+ * some amount of time after, if the sleep_after parameter is true.
*/
-void add_hwgenerator_randomness(const void *buf, size_t len, size_t entropy)
+void add_hwgenerator_randomness(const void *buf, size_t len, size_t entropy, bool sleep_after)
{
mix_pool_bytes(buf, len);
credit_init_bits(entropy);
@@ -920,7 +920,7 @@ void add_hwgenerator_randomness(const void *buf, size_t len, size_t entropy)
* Throttle writing to once every reseed interval, unless we're not yet
* initialized or no entropy is credited.
*/
- if (!kthread_should_stop() && (crng_ready() || !entropy))
+ if (sleep_after && !kthread_should_stop() && (crng_ready() || !entropy))
schedule_timeout_interruptible(crng_reseed_interval());
}
EXPORT_SYMBOL_GPL(add_hwgenerator_randomness);