Next patches need to check suspend flag at this work item, and the rwlock is used to protect the suspend flag update. If the work takes the rwlock too it will produce a deadlock.
Make flushing work do nothing when called by de-initializing everything: vq->ready, vq->kickfd, vq->cb.callback. Signed-off-by: Eugenio Pérez <[email protected]> --- drivers/vdpa/vdpa_user/vduse_dev.c | 67 ++++++++++++++++-------------- 1 file changed, 35 insertions(+), 32 deletions(-) diff --git a/drivers/vdpa/vdpa_user/vduse_dev.c b/drivers/vdpa/vdpa_user/vduse_dev.c index 307d13fbe942..347afe7c6d92 100644 --- a/drivers/vdpa/vdpa_user/vduse_dev.c +++ b/drivers/vdpa/vdpa_user/vduse_dev.c @@ -503,46 +503,49 @@ static void vduse_dev_reset(struct vduse_dev *dev) vduse_domain_reset_bounce_map(domain); } - down_write(&dev->rwsem); + scoped_guard(rwsem_write, &dev->rwsem) { + dev->status = 0; + dev->driver_features = 0; + dev->generation++; + spin_lock(&dev->irq_lock); + dev->config_cb.callback = NULL; + dev->config_cb.private = NULL; + spin_unlock(&dev->irq_lock); + + for (i = 0; i < dev->vq_num; i++) { + struct vduse_virtqueue *vq = dev->vqs[i]; + + scoped_guard(spinlock_bh, &vq->ready_lock) { + vq->ready = false; + } + vq->desc_addr = 0; + vq->driver_addr = 0; + vq->device_addr = 0; + vq->num = 0; + memset(&vq->state, 0, sizeof(vq->state)); + + spin_lock(&vq->kick_lock); + vq->kicked = false; + if (vq->kickfd) + eventfd_ctx_put(vq->kickfd); + vq->kickfd = NULL; + spin_unlock(&vq->kick_lock); + + spin_lock(&vq->irq_lock); + vq->cb.callback = NULL; + vq->cb.private = NULL; + vq->cb.trigger = NULL; + spin_unlock(&vq->irq_lock); + } + } - dev->status = 0; - dev->driver_features = 0; - dev->generation++; - spin_lock(&dev->irq_lock); - dev->config_cb.callback = NULL; - dev->config_cb.private = NULL; - spin_unlock(&dev->irq_lock); flush_work(&dev->inject); - for (i = 0; i < dev->vq_num; i++) { struct vduse_virtqueue *vq = dev->vqs[i]; - scoped_guard(spinlock_bh, &vq->ready_lock) { - vq->ready = false; - } - vq->desc_addr = 0; - vq->driver_addr = 0; - vq->device_addr = 0; - vq->num = 0; - memset(&vq->state, 0, sizeof(vq->state)); - - spin_lock(&vq->kick_lock); - vq->kicked = false; - if (vq->kickfd) - eventfd_ctx_put(vq->kickfd); - vq->kickfd = NULL; - spin_unlock(&vq->kick_lock); - - spin_lock(&vq->irq_lock); - vq->cb.callback = NULL; - vq->cb.private = NULL; - vq->cb.trigger = NULL; - spin_unlock(&vq->irq_lock); flush_work(&vq->inject); flush_work(&vq->kick); } - - up_write(&dev->rwsem); } static int vduse_vdpa_set_vq_address(struct vdpa_device *vdpa, u16 idx, -- 2.55.0
