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virtio-rng corner case fixes, with cc:stable. 

Survived a few days in linux-next.
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Merge tag 'fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux

Pull virtio fixes from Rusty Russell:
 "virtio-rng corner case fixes, with cc:stable.

  Survived a few days in linux-next"

* tag 'fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux:
  virtio-rng: skip reading when we start to remove the device
  virtio-rng: fix stuck of hot-unplugging busy device
hifive-unleashed-5.1
Linus Torvalds 2014-09-15 20:35:32 -07:00
parent 2324067fa9 f49819560f
commit 2856db7099
1 changed files with 7 additions and 0 deletions
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7
drivers/char/hw_random/virtio-rng.c
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@ -36,6 +36,7 @@ struct virtrng_info {
int index;
bool busy;
bool hwrng_register_done;
bool hwrng_removed;
};
@ -68,6 +69,9 @@ static int virtio_read(struct hwrng *rng, void *buf, size_t size, bool wait)
int ret;
struct virtrng_info *vi = (struct virtrng_info *)rng->priv;
if (vi->hwrng_removed)
return -ENODEV;
if (!vi->busy) {
vi->busy = true;
init_completion(&vi->have_data);
@ -137,6 +141,9 @@ static void remove_common(struct virtio_device *vdev)
{
struct virtrng_info *vi = vdev->priv;
vi->hwrng_removed = true;
vi->data_avail = 0;
complete(&vi->have_data);
vdev->config->reset(vdev);
vi->busy = false;
if (vi->hwrng_register_done)