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authorLinus Torvalds <torvalds@linux-foundation.org>2012-07-30 22:24:37 +0200
committerLinus Torvalds <torvalds@linux-foundation.org>2012-07-30 22:24:37 +0200
commit95b18e69950ca7fd9acfa55964e929f58bec9379 (patch)
tree5168f81b49cdfa2bcf363e4bd86cbfd669493ebd /drivers/char/hw_random
parentMerge tag 'please-pull-ia64-fixes' of git://git.kernel.org/pub/scm/linux/kern... (diff)
parentvirtio-blk: return VIRTIO_BLK_F_FLUSH to header. (diff)
downloadlinux-95b18e69950ca7fd9acfa55964e929f58bec9379.tar.xz
linux-95b18e69950ca7fd9acfa55964e929f58bec9379.zip
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.c37
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)