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ath9k: avoid potential freezing during random generator read 

In the worst case, ath9k_rng_stop() may take 10s to stop rng kthread.
The time is too long for users, use wait_event_interruptible_timeout()
instead of msleep_interruptible(), wakup immediately once
kthread_should_stop() is true.

Signed-off-by: Miaoqing Pan <miaoqing@codeaurora.org>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>
This commit is contained in:
Miaoqing Pan 2017-06-27 17:31:54 +03:00 committed by Kalle Valo
parent 07246c1158
commit 473becac4b
1 changed files with 5 additions and 1 deletions
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6
drivers/net/wireless/ath/ath9k/rng.c
View File

@ -24,6 +24,8 @@
#define ATH9K_RNG_BUF_SIZE 320
#define ATH9K_RNG_ENTROPY(x) (((x) * 8 * 10) >> 5) /* quality: 10/32 */
static DECLARE_WAIT_QUEUE_HEAD(rng_queue);
static int ath9k_rng_data_read(struct ath_softc *sc, u32 *buf, u32 buf_size)
{
int i, j;
@ -85,7 +87,9 @@ static int ath9k_rng_kthread(void *data)
ATH9K_RNG_BUF_SIZE);
if (unlikely(!bytes_read)) {
delay = ath9k_rng_delay_get(++fail_stats);
msleep_interruptible(delay);
wait_event_interruptible_timeout(rng_queue,
kthread_should_stop(),
msecs_to_jiffies(delay));
continue;
}