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| author | Eugene Grosbein <eugen@FreeBSD.org> | 2022-03-16 04:41:51 +0000 |
|---|---|---|
| committer | Eugene Grosbein <eugen@FreeBSD.org> | 2022-03-19 04:20:58 +0000 |
| commit | 4a11315a2c3fc55333772f48aaef32ae1eb11ceb (patch) | |
| tree | 9fbe233789287dce12c70b65bd05f12f843ba813 /sys/dev | |
| parent | f877ca16c9457cb3611bbb53bf84b4859d0c07cc (diff) | |
| download | src-4a11315a2c3fc55333772f48aaef32ae1eb11ceb.tar.gz src-4a11315a2c3fc55333772f48aaef32ae1eb11ceb.zip | |
Diffstat (limited to 'sys/dev')
| -rw-r--r-- | sys/dev/virtio/random/virtio_random.c | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/sys/dev/virtio/random/virtio_random.c b/sys/dev/virtio/random/virtio_random.c index a8553ecab287..a95dcadcddcd 100644 --- a/sys/dev/virtio/random/virtio_random.c +++ b/sys/dev/virtio/random/virtio_random.c @@ -32,6 +32,8 @@ __FBSDID("$FreeBSD$"); #include <sys/param.h> +#include <sys/types.h> +#include <sys/eventhandler.h> #include <sys/kernel.h> #include <sys/malloc.h> #include <sys/module.h> @@ -52,6 +54,8 @@ struct vtrnd_softc { device_t vtrnd_dev; uint64_t vtrnd_features; struct virtqueue *vtrnd_vq; + eventhandler_tag eh; + bool inactive; }; static int vtrnd_modevent(module_t, int, void *); @@ -59,6 +63,7 @@ static int vtrnd_modevent(module_t, int, void *); static int vtrnd_probe(device_t); static int vtrnd_attach(device_t); static int vtrnd_detach(device_t); +static int vtrnd_shutdown(device_t); static int vtrnd_negotiate_features(struct vtrnd_softc *); static int vtrnd_setup_features(struct vtrnd_softc *); @@ -86,6 +91,7 @@ static device_method_t vtrnd_methods[] = { DEVMETHOD(device_probe, vtrnd_probe), DEVMETHOD(device_attach, vtrnd_attach), DEVMETHOD(device_detach, vtrnd_detach), + DEVMETHOD(device_shutdown, vtrnd_shutdown), DEVMETHOD_END }; @@ -160,6 +166,16 @@ vtrnd_attach(device_t dev) error = EEXIST; goto fail; } + + sc->eh = EVENTHANDLER_REGISTER(shutdown_post_sync, + vtrnd_shutdown, dev, SHUTDOWN_PRI_LAST + 1); /* ??? */ + if (sc->eh == NULL) { + device_printf(dev, "Shutdown event registration failed\n"); + error = ENXIO; + goto fail; + } + + sc->inactive = false; random_source_register(&random_vtrnd); fail: @@ -179,12 +195,28 @@ vtrnd_detach(device_t dev) atomic_load_explicit(&g_vtrnd_softc, memory_order_acquire) == sc, ("only one global instance at a time")); + sc->inactive = true; + if (sc->eh != NULL) { + EVENTHANDLER_DEREGISTER(shutdown_post_sync, sc->eh); + sc->eh = NULL; + } random_source_deregister(&random_vtrnd); atomic_store_explicit(&g_vtrnd_softc, NULL, memory_order_release); return (0); } static int +vtrnd_shutdown(device_t dev) +{ + struct vtrnd_softc *sc; + + sc = device_get_softc(dev); + sc->inactive = true; + + return(0); +} + +static int vtrnd_negotiate_features(struct vtrnd_softc *sc) { device_t dev; @@ -235,6 +267,9 @@ vtrnd_harvest(struct vtrnd_softc *sc, void *buf, size_t *sz) _Static_assert(sizeof(value) < PAGE_SIZE, "sglist assumption"); + if (sc->inactive) + return (EDEADLK); + sglist_init(&sg, 1, segs); error = sglist_append(&sg, value, *sz); if (error != 0) |