lkml.org 
[lkml]   [2014]   [Aug]   [11]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[3.16 stable PATCH 1/1] virtio-rng: fix multi-device startup
Date
This is a 3.16-only patch.  The linux.git fix is
5c06273401f2eb7b290cadbae18ee00f8f65e893, which fixes this issue in a
different way.

Amos reported using multiple virtio-rng devices cause boot to freeze
even after the recent fixes. We need the probe_done test per device
rather than just once for the driver.

Reported-by: Amos Kong <akong@redhat.com>
Signed-off-by: Amit Shah <amit.shah@redhat.com>
---
drivers/char/hw_random/virtio-rng.c | 7 +++----
1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/drivers/char/hw_random/virtio-rng.c b/drivers/char/hw_random/virtio-rng.c
index e9b15bc..124cac5 100644
--- a/drivers/char/hw_random/virtio-rng.c
+++ b/drivers/char/hw_random/virtio-rng.c
@@ -34,12 +34,11 @@ struct virtrng_info {
unsigned int data_avail;
struct completion have_data;
bool busy;
+ bool probe_done;
char name[25];
int index;
};

-static bool probe_done;
-
static void random_recv_done(struct virtqueue *vq)
{
struct virtrng_info *vi = vq->vdev->priv;
@@ -73,7 +72,7 @@ static int virtio_read(struct hwrng *rng, void *buf, size_t size, bool wait)
* Don't ask host for data till we're setup. This call can
* happen during hwrng_register(), after commit d9e7972619.
*/
- if (unlikely(!probe_done))
+ if (unlikely(!vi->probe_done))
return 0;

if (!vi->busy) {
@@ -146,7 +145,7 @@ static int probe_common(struct virtio_device *vdev)
return err;
}

- probe_done = true;
+ vi->probe_done = true;
return 0;
}

--
1.9.3


\
 
 \ /
  Last update: 2014-08-11 15:01    [W:0.052 / U:0.420 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site