Claude review: drm/imagination: Fix deadlock in soft reset sequence

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

Overall Series Review

Subject: drm/imagination: Fix deadlock in soft reset sequence
Author: Alessio Belle <alessio.belle@imgtec.com>
Patches: 1
Reviewed: 2026-03-10T12:12:14.321041

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This is a single-patch fix for a real deadlock in the PowerVR (Imagination) DRM driver. The analysis is sound: `pvr_power_reset(pvr_dev, false)` (soft reset) is called from `process_fwccb_command()` → `pvr_fwccb_process()` → `pvr_device_irq_thread_handler()`, which is the threaded IRQ handler. Calling `disable_irq()` from within that handler will deadlock because `disable_irq()` waits (via `synchronize_irq()`) for any running threaded handler to complete — i.e., it waits for itself.

The fix is correct and minimal: use `disable_irq_nosync()` for the soft reset path, which disables the IRQ without waiting for the current handler to finish. This is safe because we are *already inside* the only handler that could be running.

The patch is well-tagged with `Fixes:` and `Cc: stable`, appropriate for a deadlock fix.

**Verdict: This patch looks good and is ready to merge.**

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