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Message-Id: <1411043867-21109-5-git-send-email-akong@redhat.com> Date: Thu, 18 Sep 2014 20:37:45 +0800 From: Amos Kong <akong@...hat.com> To: virtualization@...ts.linux-foundation.org Cc: kvm@...r.kernel.org, herbert@...dor.apana.org.au, m@...s.ch, mpm@...enic.com, amit.shah@...hat.com, rusty@...tcorp.com.au, linux-kernel@...r.kernel.org Subject: [PATCH v2 4/6] hw_random: fix unregister race. From: Rusty Russell <rusty@...tcorp.com.au> The previous patch added one potential problem: we can still be reading from a hwrng when it's unregistered. Add a wait for zero in the hwrng_unregister path. Signed-off-by: Rusty Russell <rusty@...tcorp.com.au> --- drivers/char/hw_random/core.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/char/hw_random/core.c b/drivers/char/hw_random/core.c index ee9e504..9f6f5bb 100644 --- a/drivers/char/hw_random/core.c +++ b/drivers/char/hw_random/core.c @@ -60,6 +60,7 @@ static DEFINE_MUTEX(rng_mutex); static DEFINE_MUTEX(reading_mutex); static int data_avail; static u8 *rng_buffer, *rng_fillbuf; +static DECLARE_WAIT_QUEUE_HEAD(rng_done); static unsigned short current_quality; static unsigned short default_quality; /* = 0; default to "off" */ @@ -98,6 +99,7 @@ static inline void cleanup_rng(struct kref *kref) if (rng->cleanup) rng->cleanup(rng); + wake_up_all(&rng_done); } static void set_current_rng(struct hwrng *rng) -- 1.9.3 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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