Claude review: drm/virtio: abort virtqueue wait on device removal to avoid hung task

[Claude Code Review Bot <claude-review@example.com>]

Overall Series Review

Subject: drm/virtio: abort virtqueue wait on device removal to avoid hung task
Author: Ryosuke Yasuoka <ryasuoka@redhat.com>
Patches: 2
Reviewed: 2026-06-04T14:31:07.760561

---

This is a single-patch fix for a real hang scenario in the virtio-gpu driver. The problem is well-identified: `wait_event()` calls in `virtio_gpu_queue_ctrl_sgs()` and `virtio_gpu_queue_cursor()` can block indefinitely if the host stops processing commands, and since they're inside `drm_dev_enter()`/`drm_dev_exit()` critical sections, `drm_dev_unplug()` (which calls `synchronize_srcu()`) will also hang, blocking device removal and system shutdown.

The approach — adding a `vqs_released` flag checked in the wait condition, set before `drm_dev_unplug()` — is a reasonable and straightforward solution. The cleanup paths mirror the existing `drm_dev_enter()` failure paths, which is correct.

**Overall: The patch is a solid fix for a real problem. There are a few concerns worth raising, mostly around memory ordering and minor style, but nothing blocking.**

---
Generated by Claude Code Patch Reviewer