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| author |   Jim Quigley <Jim.Quigley@oracle.com> | 2017-11-03 09:57:21 +0000 |
|---|---|---|
| committer |   Herbert Xu <herbert@gondor.apana.org.au> | 2017-11-06 14:45:06 +0800 |
| commit | e5cc6e79bbe0b06d3ec56f5210bd4fc90bcf4d2b (patch) | |
| tree | 528eeaa99d29a896c4757a935d052c32cc1e353b /drivers/char | |
| parent | crypto: atmel - remove empty functions (diff) | |
| download | linux-dev-e5cc6e79bbe0b06d3ec56f5210bd4fc90bcf4d2b.tar.xz linux-dev-e5cc6e79bbe0b06d3ec56f5210bd4fc90bcf4d2b.zip | |
hwrng: virtio - Virtio RNG devices need to be re-registered after suspend/resume
The patch for
commit: 5c06273401f2eb7b290cadbae18ee00f8f65e893
Author: Amit Shah <amit.shah@redhat.com>
Date: Sun Jul 27 07:34:01 2014 +0930
virtio: rng: delay hwrng_register() till driver is ready
moved the call to hwrng_register() out of the probe routine into the scan
routine. We need to call hwrng_register() after a suspend/restore cycle
to re-register the device, but the scan function is not invoked for the
restore. Add the call to hwrng_register() to virtio_restore().
Reviewed-by: Liam Merwick <Liam.Merwick@oracle.com>
Signed-off-by: Jim Quigley <Jim.Quigley@oracle.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'drivers/char')
| -rw-r--r-- | drivers/char/hw_random/virtio-rng.c | 21 |
1 files changed, 20 insertions, 1 deletions
diff --git a/drivers/char/hw_random/virtio-rng.c b/drivers/char/hw_random/virtio-rng.c index 3fa2f8a009b3..b89df66ea1ae 100644 --- a/drivers/char/hw_random/virtio-rng.c +++ b/drivers/char/hw_random/virtio-rng.c @@ -184,7 +184,26 @@ static int virtrng_freeze(struct virtio_device *vdev) static int virtrng_restore(struct virtio_device *vdev) { - return probe_common(vdev); + int err; + + err = probe_common(vdev); + if (!err) { + struct virtrng_info *vi = vdev->priv; + + /* + * Set hwrng_removed to ensure that virtio_read() + * does not block waiting for data before the + * registration is complete. + */ + vi->hwrng_removed = true; + err = hwrng_register(&vi->hwrng); + if (!err) { + vi->hwrng_register_done = true; + vi->hwrng_removed = false; + } + } + + return err; } #endif |