habanalabs: fix double unlock on error in map_device_va()

If hl_mmu_prefetch_cache_range() fails then this code calls
mutex_unlock(&ctx->mmu_lock) when it's no longer holding the mutex.

Fixes: 9e495e24 ("habanalabs: do MMU prefetch as deferred work")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Oded Gabbay <ogabbay@kernel.org>
Signed-off-by: Oded Gabbay <ogabbay@kernel.org>

drivers/misc/habanalabs/common/memory.c

@@ -1245,16 +1245,16 @@ static int map_device_va(struct hl_ctx *ctx, struct hl_mem_in *args, u64 *device
 	rc = map_phys_pg_pack(ctx, ret_vaddr, phys_pg_pack);
 	if (rc) {
 		dev_err(hdev->dev, "mapping page pack failed for handle %u\n", handle);
+		mutex_unlock(&ctx->mmu_lock);
 		goto map_err;
 	}
 
 	rc = hl_mmu_invalidate_cache_range(hdev, false, *vm_type | MMU_OP_SKIP_LOW_CACHE_INV,
 				ctx->asid, ret_vaddr, phys_pg_pack->total_size);
+	mutex_unlock(&ctx->mmu_lock);
 	if (rc)
 		goto map_err;
 
-	mutex_unlock(&ctx->mmu_lock);
-
 	/*
 	 * prefetch is done upon user's request. it is performed in WQ as and so can
 	 * be outside the MMU lock. the operation itself is already protected by the mmu lock
@@ -1283,8 +1283,6 @@ static int map_device_va(struct hl_ctx *ctx, struct hl_mem_in *args, u64 *device
 	return rc;
 
 map_err:
-	mutex_unlock(&ctx->mmu_lock);
-
 	if (add_va_block(hdev, va_range, ret_vaddr,
 				ret_vaddr + phys_pg_pack->total_size - 1))
 		dev_warn(hdev->dev,