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author | Linus Torvalds <torvalds@linux-foundation.org> | 2012-07-31 00:24:37 +0400 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-07-31 00:24:37 +0400 |
commit | 95b18e69950ca7fd9acfa55964e929f58bec9379 (patch) | |
tree | 5168f81b49cdfa2bcf363e4bd86cbfd669493ebd /drivers/char/hw_random | |
parent | 6d8a97af63222c5cbc7fe63ae19345e74e153e90 (diff) | |
parent | 6a743897144500fb4c4566ced3a498d5180fbb5b (diff) | |
download | linux-95b18e69950ca7fd9acfa55964e929f58bec9379.tar.xz |
Merge tag 'virtio-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux-2.6-for-linus
Pull virtio update from Rusty Russell:
"Virtio patches, mainly hotplugging fixes."
* tag 'virtio-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux-2.6-for-linus:
virtio-blk: return VIRTIO_BLK_F_FLUSH to header.
virtio-blk: allow toggling host cache between writeback and writethrough
virtio-blk: Use block layer provided spinlock
virtio-blk: Reset device after blk_cleanup_queue()
virtio-blk: Call del_gendisk() before disable guest kick
virtio: rng: s3/s4 support
virtio: rng: split out common code in probe / remove for s3/s4 ops
virtio: rng: don't wait on host when module is going away
virtio: rng: allow tasks to be killed that are waiting for rng input
virtio ids: fix comment for virtio-rng
Diffstat (limited to 'drivers/char/hw_random')
-rw-r--r-- | drivers/char/hw_random/virtio-rng.c | 37 |
1 files changed, 34 insertions, 3 deletions
diff --git a/drivers/char/hw_random/virtio-rng.c b/drivers/char/hw_random/virtio-rng.c index 723725bbb96b..5708299507d0 100644 --- a/drivers/char/hw_random/virtio-rng.c +++ b/drivers/char/hw_random/virtio-rng.c @@ -55,6 +55,7 @@ static void register_buffer(u8 *buf, size_t size) static int virtio_read(struct hwrng *rng, void *buf, size_t size, bool wait) { + int ret; if (!busy) { busy = true; @@ -65,7 +66,9 @@ static int virtio_read(struct hwrng *rng, void *buf, size_t size, bool wait) if (!wait) return 0; - wait_for_completion(&have_data); + ret = wait_for_completion_killable(&have_data); + if (ret < 0) + return ret; busy = false; @@ -85,7 +88,7 @@ static struct hwrng virtio_hwrng = { .read = virtio_read, }; -static int virtrng_probe(struct virtio_device *vdev) +static int probe_common(struct virtio_device *vdev) { int err; @@ -103,13 +106,37 @@ static int virtrng_probe(struct virtio_device *vdev) return 0; } -static void __devexit virtrng_remove(struct virtio_device *vdev) +static void remove_common(struct virtio_device *vdev) { vdev->config->reset(vdev); + busy = false; hwrng_unregister(&virtio_hwrng); vdev->config->del_vqs(vdev); } +static int virtrng_probe(struct virtio_device *vdev) +{ + return probe_common(vdev); +} + +static void __devexit virtrng_remove(struct virtio_device *vdev) +{ + remove_common(vdev); +} + +#ifdef CONFIG_PM +static int virtrng_freeze(struct virtio_device *vdev) +{ + remove_common(vdev); + return 0; +} + +static int virtrng_restore(struct virtio_device *vdev) +{ + return probe_common(vdev); +} +#endif + static struct virtio_device_id id_table[] = { { VIRTIO_ID_RNG, VIRTIO_DEV_ANY_ID }, { 0 }, @@ -121,6 +148,10 @@ static struct virtio_driver virtio_rng_driver = { .id_table = id_table, .probe = virtrng_probe, .remove = __devexit_p(virtrng_remove), +#ifdef CONFIG_PM + .freeze = virtrng_freeze, + .restore = virtrng_restore, +#endif }; static int __init init(void) |