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path: root/drivers/net/wireless/ath/ath9k/rng.c
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Diffstat (limited to 'drivers/net/wireless/ath/ath9k/rng.c')
-rw-r--r--drivers/net/wireless/ath/ath9k/rng.c20
1 files changed, 19 insertions, 1 deletions
diff --git a/drivers/net/wireless/ath/ath9k/rng.c b/drivers/net/wireless/ath/ath9k/rng.c
index c9cb2aad7b6f..d38e50f96db7 100644
--- a/drivers/net/wireless/ath/ath9k/rng.c
+++ b/drivers/net/wireless/ath/ath9k/rng.c
@@ -55,11 +55,26 @@ static int ath9k_rng_data_read(struct ath_softc *sc, u32 *buf, u32 buf_size)
return j << 2;
}
+static u32 ath9k_rng_delay_get(u32 fail_stats)
+{
+ u32 delay;
+
+ if (fail_stats < 100)
+ delay = 10;
+ else if (fail_stats < 105)
+ delay = 1000;
+ else
+ delay = 10000;
+
+ return delay;
+}
+
static int ath9k_rng_kthread(void *data)
{
int bytes_read;
struct ath_softc *sc = data;
u32 *rng_buf;
+ u32 delay, fail_stats = 0;
rng_buf = kmalloc_array(ATH9K_RNG_BUF_SIZE, sizeof(u32), GFP_KERNEL);
if (!rng_buf)
@@ -69,10 +84,13 @@ static int ath9k_rng_kthread(void *data)
bytes_read = ath9k_rng_data_read(sc, rng_buf,
ATH9K_RNG_BUF_SIZE);
if (unlikely(!bytes_read)) {
- msleep_interruptible(10);
+ delay = ath9k_rng_delay_get(++fail_stats);
+ msleep_interruptible(delay);
continue;
}
+ fail_stats = 0;
+
/* sleep until entropy bits under write_wakeup_threshold */
add_hwgenerator_randomness((void *)rng_buf, bytes_read,
ATH9K_RNG_ENTROPY(bytes_read));