Re: drm/ttm: switch to per device LRU lock

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Static analysis with Coverity in linux-next has detected an issue in
drivers/gpu/drm/ttm/ttm_bo.c with the follow commit:

commit a1f091f8ef2b680a5184db065527612247cb4cae
Author: Christian König <christian.koenig@xxxxxxx>
Date:   Tue Oct 6 17:26:42 2020 +0200

    drm/ttm: switch to per device LRU lock

    Instead of having a global lock for potentially less contention.

The analysis is as follows:

617 int ttm_mem_evict_first(struct ttm_device *bdev,
618                        struct ttm_resource_manager *man,
619                        const struct ttm_place *place,
620                        struct ttm_operation_ctx *ctx,
621                        struct ww_acquire_ctx *ticket)
622 {
   1. assign_zero: Assigning: bo = NULL.

623        struct ttm_buffer_object *bo = NULL, *busy_bo = NULL;
624        bool locked = false;
625        unsigned i;
626        int ret;

   Explicit null dereferenced (FORWARD_NULL)2. var_deref_op:
Dereferencing null pointer bo.

628        spin_lock(&bo->bdev->lru_lock);
629        for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {

The spin_lock on bo is dereferencing a null bo pointer.

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