drm/amdkfd: Change x==NULL/false references to !x

Upstream prefers the !x notation to x==NULL or x==false. Along those lines
change the ==true or !=NULL references as well. Also make the references
to !x the same, excluding () for readability.
Signed-off-by: Kent Russell <kent.russell@amd.com>
Signed-off-by: Felix Kuehling <Felix.Kuehling@amd.com>
Reviewed-by: Oded Gabbay <oded.gabbay@gmail.com>
Signed-off-by: Oded Gabbay <oded.gabbay@gmail.com>

drivers/gpu/drm/amd/amdkfd/kfd_chardev.c

@@ -265,7 +265,7 @@ static int kfd_ioctl_create_queue(struct file *filep, struct kfd_process *p,
 
 	pr_debug("Looking for gpu id 0x%x\n", args->gpu_id);
 	dev = kfd_device_by_id(args->gpu_id);
-	if (dev == NULL) {
+	if (!dev) {
 		pr_debug("Could not find gpu id 0x%x\n", args->gpu_id);
 		return -EINVAL;
 	}
@@ -400,7 +400,7 @@ static int kfd_ioctl_set_memory_policy(struct file *filep,
 	}
 
 	dev = kfd_device_by_id(args->gpu_id);
-	if (dev == NULL)
+	if (!dev)
 		return -EINVAL;
 
 	mutex_lock(&p->mutex);
@@ -443,7 +443,7 @@ static int kfd_ioctl_dbg_register(struct file *filep,
 	long status = 0;
 
 	dev = kfd_device_by_id(args->gpu_id);
-	if (dev == NULL)
+	if (!dev)
 		return -EINVAL;
 
 	if (dev->device_info->asic_family == CHIP_CARRIZO) {
@@ -465,7 +465,7 @@ static int kfd_ioctl_dbg_register(struct file *filep,
 		return PTR_ERR(pdd);
 	}
 
-	if (dev->dbgmgr == NULL) {
+	if (!dev->dbgmgr) {
 		/* In case of a legal call, we have no dbgmgr yet */
 		create_ok = kfd_dbgmgr_create(&dbgmgr_ptr, dev);
 		if (create_ok) {
@@ -494,7 +494,7 @@ static int kfd_ioctl_dbg_unregister(struct file *filep,
 	long status;
 
 	dev = kfd_device_by_id(args->gpu_id);
-	if (dev == NULL)
+	if (!dev)
 		return -EINVAL;
 
 	if (dev->device_info->asic_family == CHIP_CARRIZO) {
@@ -505,7 +505,7 @@ static int kfd_ioctl_dbg_unregister(struct file *filep,
 	mutex_lock(kfd_get_dbgmgr_mutex());
 
 	status = kfd_dbgmgr_unregister(dev->dbgmgr, p);
-	if (status == 0) {
+	if (!status) {
 		kfd_dbgmgr_destroy(dev->dbgmgr);
 		dev->dbgmgr = NULL;
 	}
@@ -539,7 +539,7 @@ static int kfd_ioctl_dbg_address_watch(struct file *filep,
 	memset((void *) &aw_info, 0, sizeof(struct dbg_address_watch_info));
 
 	dev = kfd_device_by_id(args->gpu_id);
-	if (dev == NULL)
+	if (!dev)
 		return -EINVAL;
 
 	if (dev->device_info->asic_family == CHIP_CARRIZO) {
@@ -646,7 +646,7 @@ static int kfd_ioctl_dbg_wave_control(struct file *filep,
 				sizeof(wac_info.trapId);
 
 	dev = kfd_device_by_id(args->gpu_id);
-	if (dev == NULL)
+	if (!dev)
 		return -EINVAL;
 
 	if (dev->device_info->asic_family == CHIP_CARRIZO) {
@@ -782,9 +782,9 @@ static int kfd_ioctl_get_process_apertures(struct file *filp,
 				"scratch_limit %llX\n", pdd->scratch_limit);
 
 			args->num_of_nodes++;
-		} while ((pdd = kfd_get_next_process_device_data(p, pdd)) !=
-				NULL &&
-				(args->num_of_nodes < NUM_OF_SUPPORTED_GPUS));
+
+			pdd = kfd_get_next_process_device_data(p, pdd);
+		} while (pdd && (args->num_of_nodes < NUM_OF_SUPPORTED_GPUS));
 	}
 
 	mutex_unlock(&p->mutex);

drivers/gpu/drm/amd/amdkfd/kfd_dbgdev.c

@@ -77,7 +77,7 @@ static int dbgdev_diq_submit_ib(struct kfd_dbgdev *dbgdev,
 	status = kq->ops.acquire_packet_buffer(kq,
 				pq_packets_size_in_bytes / sizeof(uint32_t),
 				&ib_packet_buff);
-	if (status != 0) {
+	if (status) {
 		pr_err("acquire_packet_buffer failed\n");
 		return status;
 	}
@@ -115,7 +115,7 @@ static int dbgdev_diq_submit_ib(struct kfd_dbgdev *dbgdev,
 	status = kfd_gtt_sa_allocate(dbgdev->dev, sizeof(uint64_t),
 					&mem_obj);
 
-	if (status != 0) {
+	if (status) {
 		pr_err("Failed to allocate GART memory\n");
 		kq->ops.rollback_packet(kq);
 		return status;
@@ -202,7 +202,7 @@ static int dbgdev_register_diq(struct kfd_dbgdev *dbgdev)
 
 	kq = pqm_get_kernel_queue(dbgdev->pqm, qid);
 
-	if (kq == NULL) {
+	if (!kq) {
 		pr_err("Error getting DIQ\n");
 		pqm_destroy_queue(dbgdev->pqm, qid);
 		return -EFAULT;
@@ -252,7 +252,7 @@ static void dbgdev_address_watch_set_registers(
 	addrLo->u32All = 0;
 	cntl->u32All = 0;
 
-	if (adw_info->watch_mask != NULL)
+	if (adw_info->watch_mask)
 		cntl->bitfields.mask =
 			(uint32_t) (adw_info->watch_mask[index] &
 					ADDRESS_WATCH_REG_CNTL_DEFAULT_MASK);
@@ -307,8 +307,7 @@ static int dbgdev_address_watch_nodiq(struct kfd_dbgdev *dbgdev,
 		return -EINVAL;
 	}
 
-	if ((adw_info->watch_mode == NULL) ||
-		(adw_info->watch_address == NULL)) {
+	if (!adw_info->watch_mode || !adw_info->watch_address) {
 		pr_err("adw_info fields are not valid\n");
 		return -EINVAL;
 	}
@@ -375,15 +374,14 @@ static int dbgdev_address_watch_diq(struct kfd_dbgdev *dbgdev,
 		return -EINVAL;
 	}
 
-	if ((NULL == adw_info->watch_mode) ||
-			(NULL == adw_info->watch_address)) {
+	if (!adw_info->watch_mode || !adw_info->watch_address) {
 		pr_err("adw_info fields are not valid\n");
 		return -EINVAL;
 	}
 
 	status = kfd_gtt_sa_allocate(dbgdev->dev, ib_size, &mem_obj);
 
-	if (status != 0) {
+	if (status) {
 		pr_err("Failed to allocate GART memory\n");
 		return status;
 	}
@@ -490,7 +488,7 @@ static int dbgdev_address_watch_diq(struct kfd_dbgdev *dbgdev,
 					packet_buff_uint,
 					ib_size);
 
-		if (status != 0) {
+		if (status) {
 			pr_err("Failed to submit IB to DIQ\n");
 			break;
 		}
@@ -711,7 +709,7 @@ static int dbgdev_wave_control_diq(struct kfd_dbgdev *dbgdev,
 			packet_buff_uint,
 			ib_size);
 
-	if (status != 0)
+	if (status)
 		pr_err("Failed to submit IB to DIQ\n");
 
 	kfd_gtt_sa_free(dbgdev->dev, mem_obj);

drivers/gpu/drm/amd/amdkfd/kfd_dbgmgr.c

@@ -55,7 +55,7 @@ static void kfd_dbgmgr_uninitialize(struct kfd_dbgmgr *pmgr)
 
 void kfd_dbgmgr_destroy(struct kfd_dbgmgr *pmgr)
 {
-	if (pmgr != NULL) {
+	if (pmgr) {
 		kfd_dbgmgr_uninitialize(pmgr);
 		kfree(pmgr);
 	}
@@ -66,7 +66,7 @@ bool kfd_dbgmgr_create(struct kfd_dbgmgr **ppmgr, struct kfd_dev *pdev)
 	enum DBGDEV_TYPE type = DBGDEV_TYPE_DIQ;
 	struct kfd_dbgmgr *new_buff;
 
-	BUG_ON(pdev == NULL);
+	BUG_ON(!pdev);
 	BUG_ON(!pdev->init_complete);
 
 	new_buff = kfd_alloc_struct(new_buff);

drivers/gpu/drm/amd/amdkfd/kfd_device.c

@@ -98,7 +98,7 @@ static const struct kfd_device_info *lookup_device_info(unsigned short did)
 
 	for (i = 0; i < ARRAY_SIZE(supported_devices); i++) {
 		if (supported_devices[i].did == did) {
-			BUG_ON(supported_devices[i].device_info == NULL);
+			BUG_ON(!supported_devices[i].device_info);
 			return supported_devices[i].device_info;
 		}
 	}
@@ -212,7 +212,7 @@ static int iommu_invalid_ppr_cb(struct pci_dev *pdev, int pasid,
 			flags);
 
 	dev = kfd_device_by_pci_dev(pdev);
-	BUG_ON(dev == NULL);
+	BUG_ON(!dev);
 
 	kfd_signal_iommu_event(dev, pasid, address,
 			flags & PPR_FAULT_WRITE, flags & PPR_FAULT_EXEC);
@@ -262,7 +262,7 @@ bool kgd2kfd_device_init(struct kfd_dev *kfd,
 
 	kfd_doorbell_init(kfd);
 
-	if (kfd_topology_add_device(kfd) != 0) {
+	if (kfd_topology_add_device(kfd)) {
 		dev_err(kfd_device, "Error adding device to topology\n");
 		goto kfd_topology_add_device_error;
 	}
@@ -288,7 +288,7 @@ bool kgd2kfd_device_init(struct kfd_dev *kfd,
 		goto device_queue_manager_error;
 	}
 
-	if (kfd->dqm->ops.start(kfd->dqm) != 0) {
+	if (kfd->dqm->ops.start(kfd->dqm)) {
 		dev_err(kfd_device,
 			"Error starting queue manager for device %x:%x\n",
 			kfd->pdev->vendor, kfd->pdev->device);
@@ -341,7 +341,7 @@ void kgd2kfd_device_exit(struct kfd_dev *kfd)
 
 void kgd2kfd_suspend(struct kfd_dev *kfd)
 {
-	BUG_ON(kfd == NULL);
+	BUG_ON(!kfd);
 
 	if (kfd->init_complete) {
 		kfd->dqm->ops.stop(kfd->dqm);

drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c

@@ -167,7 +167,7 @@ static int create_queue_nocpsch(struct device_queue_manager *dqm,
 
 	if (list_empty(&qpd->queues_list)) {
 		retval = allocate_vmid(dqm, qpd, q);
-		if (retval != 0) {
+		if (retval) {
 			mutex_unlock(&dqm->lock);
 			return retval;
 		}
@@ -180,7 +180,7 @@ static int create_queue_nocpsch(struct device_queue_manager *dqm,
 	if (q->properties.type == KFD_QUEUE_TYPE_SDMA)
 		retval = create_sdma_queue_nocpsch(dqm, q, qpd);
 
-	if (retval != 0) {
+	if (retval) {
 		if (list_empty(&qpd->queues_list)) {
 			deallocate_vmid(dqm, qpd, q);
 			*allocated_vmid = 0;
@@ -262,16 +262,16 @@ static int create_compute_queue_nocpsch(struct device_queue_manager *dqm,
 	BUG_ON(!dqm || !q || !qpd);
 
 	mqd = dqm->ops.get_mqd_manager(dqm, KFD_MQD_TYPE_COMPUTE);
-	if (mqd == NULL)
+	if (!mqd)
 		return -ENOMEM;
 
 	retval = allocate_hqd(dqm, q);
-	if (retval != 0)
+	if (retval)
 		return retval;
 
 	retval = mqd->init_mqd(mqd, &q->mqd, &q->mqd_mem_obj,
 				&q->gart_mqd_addr, &q->properties);
-	if (retval != 0) {
+	if (retval) {
 		deallocate_hqd(dqm, q);
 		return retval;
 	}
@@ -281,7 +281,7 @@ static int create_compute_queue_nocpsch(struct device_queue_manager *dqm,
 
 	retval = mqd->load_mqd(mqd, q->mqd, q->pipe,
 			q->queue, (uint32_t __user *) q->properties.write_ptr);
-	if (retval != 0) {
+	if (retval) {
 		deallocate_hqd(dqm, q);
 		mqd->uninit_mqd(mqd, q->mqd, q->mqd_mem_obj);
 		return retval;
@@ -330,7 +330,7 @@ static int destroy_queue_nocpsch(struct device_queue_manager *dqm,
 				QUEUE_PREEMPT_DEFAULT_TIMEOUT_MS,
 				q->pipe, q->queue);
 
-	if (retval != 0)
+	if (retval)
 		goto out;
 
 	mqd->uninit_mqd(mqd, q->mqd, q->mqd_mem_obj);
@@ -365,7 +365,7 @@ static int update_queue(struct device_queue_manager *dqm, struct queue *q)
 	mutex_lock(&dqm->lock);
 	mqd = dqm->ops.get_mqd_manager(dqm,
 			get_mqd_type_from_queue_type(q->properties.type));
-	if (mqd == NULL) {
+	if (!mqd) {
 		mutex_unlock(&dqm->lock);
 		return -ENOMEM;
 	}
@@ -381,7 +381,7 @@ static int update_queue(struct device_queue_manager *dqm, struct queue *q)
 	retval = mqd->update_mqd(mqd, q->mqd, &q->properties);
 	if ((q->properties.is_active) && (!prev_active))
 		dqm->queue_count++;
-	else if ((!q->properties.is_active) && (prev_active))
+	else if (!q->properties.is_active && prev_active)
 		dqm->queue_count--;
 
 	if (sched_policy != KFD_SCHED_POLICY_NO_HWS)
@@ -403,7 +403,7 @@ static struct mqd_manager *get_mqd_manager_nocpsch(
 	mqd = dqm->mqds[type];
 	if (!mqd) {
 		mqd = mqd_manager_init(type, dqm->dev);
-		if (mqd == NULL)
+		if (!mqd)
 			pr_err("mqd manager is NULL");
 		dqm->mqds[type] = mqd;
 	}
@@ -485,7 +485,7 @@ static void init_interrupts(struct device_queue_manager *dqm)
 {
 	unsigned int i;
 
-	BUG_ON(dqm == NULL);
+	BUG_ON(!dqm);
 
 	for (i = 0 ; i < get_pipes_per_mec(dqm) ; i++)
 		if (is_pipe_enabled(dqm, 0, i))
@@ -589,7 +589,7 @@ static int create_sdma_queue_nocpsch(struct device_queue_manager *dqm,
 		return -ENOMEM;
 
 	retval = allocate_sdma_queue(dqm, &q->sdma_id);
-	if (retval != 0)
+	if (retval)
 		return retval;
 
 	q->properties.sdma_queue_id = q->sdma_id % CIK_SDMA_QUEUES_PER_ENGINE;
@@ -602,14 +602,14 @@ static int create_sdma_queue_nocpsch(struct device_queue_manager *dqm,
 	dqm->ops_asic_specific.init_sdma_vm(dqm, q, qpd);
 	retval = mqd->init_mqd(mqd, &q->mqd, &q->mqd_mem_obj,
 				&q->gart_mqd_addr, &q->properties);
-	if (retval != 0) {
+	if (retval) {
 		deallocate_sdma_queue(dqm, q->sdma_id);
 		return retval;
 	}
 
 	retval = mqd->load_mqd(mqd, q->mqd, 0,
 				0, NULL);
-	if (retval != 0) {
+	if (retval) {
 		deallocate_sdma_queue(dqm, q->sdma_id);
 		mqd->uninit_mqd(mqd, q->mqd, q->mqd_mem_obj);
 		return retval;
@@ -680,7 +680,7 @@ static int initialize_cpsch(struct device_queue_manager *dqm)
 	dqm->sdma_queue_count = 0;
 	dqm->active_runlist = false;
 	retval = dqm->ops_asic_specific.initialize(dqm);
-	if (retval != 0)
+	if (retval)
 		goto fail_init_pipelines;
 
 	return 0;
@@ -700,11 +700,11 @@ static int start_cpsch(struct device_queue_manager *dqm)
 	retval = 0;
 
 	retval = pm_init(&dqm->packets, dqm);
-	if (retval != 0)
+	if (retval)
 		goto fail_packet_manager_init;
 
 	retval = set_sched_resources(dqm);
-	if (retval != 0)
+	if (retval)
 		goto fail_set_sched_resources;
 
 	pr_debug("Allocating fence memory\n");
@@ -713,7 +713,7 @@ static int start_cpsch(struct device_queue_manager *dqm)
 	retval = kfd_gtt_sa_allocate(dqm->dev, sizeof(*dqm->fence_addr),
 					&dqm->fence_mem);
 
-	if (retval != 0)
+	if (retval)
 		goto fail_allocate_vidmem;
 
 	dqm->fence_addr = dqm->fence_mem->cpu_ptr;
@@ -845,7 +845,7 @@ static int create_queue_cpsch(struct device_queue_manager *dqm, struct queue *q,
 	mqd = dqm->ops.get_mqd_manager(dqm,
 			get_mqd_type_from_queue_type(q->properties.type));
 
-	if (mqd == NULL) {
+	if (!mqd) {
 		mutex_unlock(&dqm->lock);
 		return -ENOMEM;
 	}
@@ -853,7 +853,7 @@ static int create_queue_cpsch(struct device_queue_manager *dqm, struct queue *q,
 	dqm->ops_asic_specific.init_sdma_vm(dqm, q, qpd);
 	retval = mqd->init_mqd(mqd, &q->mqd, &q->mqd_mem_obj,
 				&q->gart_mqd_addr, &q->properties);
-	if (retval != 0)
+	if (retval)
 		goto out;
 
 	list_add(&q->list, &qpd->queues_list);
@@ -934,7 +934,7 @@ static int destroy_queues_cpsch(struct device_queue_manager *dqm,
 
 	retval = pm_send_unmap_queue(&dqm->packets, KFD_QUEUE_TYPE_COMPUTE,
 			preempt_type, 0, false, 0);
-	if (retval != 0)
+	if (retval)
 		goto out;
 
 	*dqm->fence_addr = KFD_FENCE_INIT;
@@ -943,7 +943,7 @@ static int destroy_queues_cpsch(struct device_queue_manager *dqm,
 	/* should be timed out */
 	retval = amdkfd_fence_wait_timeout(dqm->fence_addr, KFD_FENCE_COMPLETED,
 				QUEUE_PREEMPT_DEFAULT_TIMEOUT_MS);
-	if (retval != 0) {
+	if (retval) {
 		pdd = kfd_get_process_device_data(dqm->dev,
 				kfd_get_process(current));
 		pdd->reset_wavefronts = true;
@@ -968,7 +968,7 @@ static int execute_queues_cpsch(struct device_queue_manager *dqm, bool lock)
 		mutex_lock(&dqm->lock);
 
 	retval = destroy_queues_cpsch(dqm, false, false);
-	if (retval != 0) {
+	if (retval) {
 		pr_err("The cp might be in an unrecoverable state due to an unsuccessful queues preemption");
 		goto out;
 	}
@@ -984,7 +984,7 @@ static int execute_queues_cpsch(struct device_queue_manager *dqm, bool lock)
 	}
 
 	retval = pm_send_runlist(&dqm->packets, &dqm->queues);
-	if (retval != 0) {
+	if (retval) {
 		pr_err("failed to execute runlist");
 		goto out;
 	}
@@ -1193,7 +1193,7 @@ struct device_queue_manager *device_queue_manager_init(struct kfd_dev *dev)
 		break;
 	}
 
-	if (dqm->ops.initialize(dqm) != 0) {
+	if (dqm->ops.initialize(dqm)) {
 		kfree(dqm);
 		return NULL;
 	}

drivers/gpu/drm/amd/amdkfd/kfd_doorbell.c

@@ -131,7 +131,7 @@ int kfd_doorbell_mmap(struct kfd_process *process, struct vm_area_struct *vma)
 
 	/* Find kfd device according to gpu id */
 	dev = kfd_device_by_id(vma->vm_pgoff);
-	if (dev == NULL)
+	if (!dev)
 		return -EINVAL;
 
 	/* Calculate physical address of doorbell */

drivers/gpu/drm/amd/amdkfd/kfd_events.c

@@ -247,7 +247,7 @@ static u32 make_nonsignal_event_id(struct kfd_process *p)
 
 	for (id = p->next_nonsignal_event_id;
 		id < KFD_LAST_NONSIGNAL_EVENT_ID &&
-		lookup_event_by_id(p, id) != NULL;
+		lookup_event_by_id(p, id);
 		id++)
 		;
 
@@ -266,7 +266,7 @@ static u32 make_nonsignal_event_id(struct kfd_process *p)
 
 	for (id = KFD_FIRST_NONSIGNAL_EVENT_ID;
 		id < KFD_LAST_NONSIGNAL_EVENT_ID &&
-		lookup_event_by_id(p, id) != NULL;
+		lookup_event_by_id(p, id);
 		id++)
 		;
 
@@ -342,7 +342,7 @@ void kfd_event_init_process(struct kfd_process *p)
 
 static void destroy_event(struct kfd_process *p, struct kfd_event *ev)
 {
-	if (ev->signal_page != NULL) {
+	if (ev->signal_page) {
 		release_event_notification_slot(ev->signal_page,
 						ev->signal_slot_index);
 		p->signal_event_count--;

drivers/gpu/drm/amd/amdkfd/kfd_flat_memory.c

@@ -304,7 +304,7 @@ int kfd_init_apertures(struct kfd_process *process)
 		id < NUM_OF_SUPPORTED_GPUS) {
 
 		pdd = kfd_create_process_device_data(dev, process);
-		if (pdd == NULL) {
+		if (!pdd) {
 			pr_err("Failed to create process device data\n");
 			return -1;
 		}

drivers/gpu/drm/amd/amdkfd/kfd_kernel_queue.c

@@ -67,12 +67,12 @@ static bool initialize(struct kernel_queue *kq, struct kfd_dev *dev,
 		break;
 	}
 
-	if (kq->mqd == NULL)
+	if (!kq->mqd)
 		return false;
 
 	prop.doorbell_ptr = kfd_get_kernel_doorbell(dev, &prop.doorbell_off);
 
-	if (prop.doorbell_ptr == NULL) {
+	if (!prop.doorbell_ptr) {
 		pr_err("Failed to initialize doorbell");
 		goto err_get_kernel_doorbell;
 	}
@@ -87,7 +87,7 @@ static bool initialize(struct kernel_queue *kq, struct kfd_dev *dev,
 	kq->pq_gpu_addr = kq->pq->gpu_addr;
 
 	retval = kq->ops_asic_specific.initialize(kq, dev, type, queue_size);
-	if (retval == false)
+	if (!retval)
 		goto err_eop_allocate_vidmem;
 
 	retval = kfd_gtt_sa_allocate(dev, sizeof(*kq->rptr_kernel),

drivers/gpu/drm/amd/amdkfd/kfd_mqd_manager_cik.c

@@ -99,7 +99,7 @@ static int init_mqd(struct mqd_manager *mm, void **mqd,
 		m->cp_hqd_iq_rptr = AQL_ENABLE;
 
 	*mqd = m;
-	if (gart_addr != NULL)
+	if (gart_addr)
 		*gart_addr = addr;
 	retval = mm->update_mqd(mm, m, q);
 
@@ -127,7 +127,7 @@ static int init_mqd_sdma(struct mqd_manager *mm, void **mqd,
 	memset(m, 0, sizeof(struct cik_sdma_rlc_registers));
 
 	*mqd = m;
-	if (gart_addr != NULL)
+	if (gart_addr)
 		*gart_addr = (*mqd_mem_obj)->gpu_addr;
 
 	retval = mm->update_mqd(mm, m, q);

drivers/gpu/drm/amd/amdkfd/kfd_mqd_manager_vi.c

@@ -85,7 +85,7 @@ static int init_mqd(struct mqd_manager *mm, void **mqd,
 		m->cp_hqd_iq_rptr = 1;
 
 	*mqd = m;
-	if (gart_addr != NULL)
+	if (gart_addr)
 		*gart_addr = addr;
 	retval = mm->update_mqd(mm, m, q);
 

drivers/gpu/drm/amd/amdkfd/kfd_packet_manager.c

@@ -98,14 +98,14 @@ static int pm_allocate_runlist_ib(struct packet_manager *pm,
 
 	BUG_ON(!pm);
 	BUG_ON(pm->allocated);
-	BUG_ON(is_over_subscription == NULL);
+	BUG_ON(!is_over_subscription);
 
 	pm_calc_rlib_size(pm, rl_buffer_size, is_over_subscription);
 
 	retval = kfd_gtt_sa_allocate(pm->dqm->dev, *rl_buffer_size,
 					&pm->ib_buffer_obj);
 
-	if (retval != 0) {
+	if (retval) {
 		pr_err("Failed to allocate runlist IB\n");
 		return retval;
 	}
@@ -321,7 +321,7 @@ static int pm_create_runlist_ib(struct packet_manager *pm,
 
 	retval = pm_allocate_runlist_ib(pm, &rl_buffer, rl_gpu_addr,
 				&alloc_size_bytes, &is_over_subscription);
-	if (retval != 0)
+	if (retval)
 		return retval;
 
 	*rl_size_bytes = alloc_size_bytes;
@@ -340,7 +340,7 @@ static int pm_create_runlist_ib(struct packet_manager *pm,
 		}
 
 		retval = pm_create_map_process(pm, &rl_buffer[rl_wptr], qpd);
-		if (retval != 0)
+		if (retval)
 			return retval;
 
 		proccesses_mapped++;
@@ -365,7 +365,7 @@ static int pm_create_runlist_ib(struct packet_manager *pm,
 						&rl_buffer[rl_wptr],
 						kq->queue,
 						qpd->is_debug);
-			if (retval != 0)
+			if (retval)
 				return retval;
 
 			inc_wptr(&rl_wptr,
@@ -392,7 +392,7 @@ static int pm_create_runlist_ib(struct packet_manager *pm,
 						q,
 						qpd->is_debug);
 
-			if (retval != 0)
+			if (retval)
 				return retval;
 
 			inc_wptr(&rl_wptr,
@@ -421,7 +421,7 @@ int pm_init(struct packet_manager *pm, struct device_queue_manager *dqm)
 	pm->dqm = dqm;
 	mutex_init(&pm->lock);
 	pm->priv_queue = kernel_queue_init(dqm->dev, KFD_QUEUE_TYPE_HIQ);
-	if (pm->priv_queue == NULL) {
+	if (!pm->priv_queue) {
 		mutex_destroy(&pm->lock);
 		return -ENOMEM;
 	}
@@ -449,7 +449,7 @@ int pm_send_set_resources(struct packet_manager *pm,
 	pm->priv_queue->ops.acquire_packet_buffer(pm->priv_queue,
 					sizeof(*packet) / sizeof(uint32_t),
 					(unsigned int **)&packet);
-	if (packet == NULL) {
+	if (!packet) {
 		mutex_unlock(&pm->lock);
 		pr_err("Failed to allocate buffer on kernel queue\n");
 		return -ENOMEM;
@@ -491,7 +491,7 @@ int pm_send_runlist(struct packet_manager *pm, struct list_head *dqm_queues)
 
 	retval = pm_create_runlist_ib(pm, dqm_queues, &rl_gpu_ib_addr,
 					&rl_ib_size);
-	if (retval != 0)
+	if (retval)
 		goto fail_create_runlist_ib;
 
 	pr_debug("runlist IB address: 0x%llX\n", rl_gpu_ib_addr);
@@ -501,12 +501,12 @@ int pm_send_runlist(struct packet_manager *pm, struct list_head *dqm_queues)
 
 	retval = pm->priv_queue->ops.acquire_packet_buffer(pm->priv_queue,
 					packet_size_dwords, &rl_buffer);
-	if (retval != 0)
+	if (retval)
 		goto fail_acquire_packet_buffer;
 
 	retval = pm_create_runlist(pm, rl_buffer, rl_gpu_ib_addr,
 					rl_ib_size / sizeof(uint32_t), false);
-	if (retval != 0)
+	if (retval)
 		goto fail_create_runlist;
 
 	pm->priv_queue->ops.submit_packet(pm->priv_queue);
@@ -537,7 +537,7 @@ int pm_send_query_status(struct packet_manager *pm, uint64_t fence_address,
 			pm->priv_queue,
 			sizeof(struct pm4_query_status) / sizeof(uint32_t),
 			(unsigned int **)&packet);
-	if (retval != 0)
+	if (retval)
 		goto fail_acquire_packet_buffer;
 
 	packet->header.u32all = build_pm4_header(IT_QUERY_STATUS,
@@ -580,7 +580,7 @@ int pm_send_unmap_queue(struct packet_manager *pm, enum kfd_queue_type type,
 			pm->priv_queue,
 			sizeof(struct pm4_unmap_queues) / sizeof(uint32_t),
 			&buffer);
-	if (retval != 0)
+	if (retval)
 		goto err_acquire_packet_buffer;
 
 	packet = (struct pm4_unmap_queues *)buffer;

drivers/gpu/drm/amd/amdkfd/kfd_process.c

@@ -81,7 +81,7 @@ struct kfd_process *kfd_create_process(const struct task_struct *thread)
 
 	BUG_ON(!kfd_process_wq);
 
-	if (thread->mm == NULL)
+	if (!thread->mm)
 		return ERR_PTR(-EINVAL);
 
 	/* Only the pthreads threading model is supported. */
@@ -117,7 +117,7 @@ struct kfd_process *kfd_get_process(const struct task_struct *thread)
 {
 	struct kfd_process *process;
 
-	if (thread->mm == NULL)
+	if (!thread->mm)
 		return ERR_PTR(-EINVAL);
 
 	/* Only the pthreads threading model is supported. */
@@ -407,7 +407,7 @@ void kfd_unbind_process_from_device(struct kfd_dev *dev, unsigned int pasid)
 	struct kfd_process *p;
 	struct kfd_process_device *pdd;
 
-	BUG_ON(dev == NULL);
+	BUG_ON(!dev);
 
 	/*
 	 * Look for the process that matches the pasid. If there is no such

drivers/gpu/drm/amd/amdkfd/kfd_process_queue_manager.c

@@ -76,7 +76,7 @@ int pqm_init(struct process_queue_manager *pqm, struct kfd_process *p)
 	pqm->queue_slot_bitmap =
 			kzalloc(DIV_ROUND_UP(KFD_MAX_NUM_OF_QUEUES_PER_PROCESS,
 					BITS_PER_BYTE), GFP_KERNEL);
-	if (pqm->queue_slot_bitmap == NULL)
+	if (!pqm->queue_slot_bitmap)
 		return -ENOMEM;
 	pqm->process = p;
 
@@ -223,7 +223,7 @@ int pqm_create_queue(struct process_queue_manager *pqm,
 		break;
 	case KFD_QUEUE_TYPE_DIQ:
 		kq = kernel_queue_init(dev, KFD_QUEUE_TYPE_DIQ);
-		if (kq == NULL) {
+		if (!kq) {
 			retval = -ENOMEM;
 			goto err_create_queue;
 		}
@@ -279,7 +279,7 @@ int pqm_destroy_queue(struct process_queue_manager *pqm, unsigned int qid)
 	retval = 0;
 
 	pqn = get_queue_by_qid(pqm, qid);
-	if (pqn == NULL) {
+	if (!pqn) {
 		pr_err("Queue id does not match any known queue\n");
 		return -EINVAL;
 	}

drivers/gpu/drm/amd/amdkfd/kfd_topology.c

@@ -416,7 +416,7 @@ static struct kfd_topology_device *kfd_create_topology_device(void)
 	struct kfd_topology_device *dev;
 
 	dev = kfd_alloc_struct(dev);
-	if (dev == NULL) {
+	if (!dev) {
 		pr_err("No memory to allocate a topology device");
 		return NULL;
 	}
@@ -957,7 +957,7 @@ static int kfd_topology_update_sysfs(void)
 	int ret;
 
 	pr_info("Creating topology SYSFS entries\n");
-	if (sys_props.kobj_topology == NULL) {
+	if (!sys_props.kobj_topology) {
 		sys_props.kobj_topology =
 				kfd_alloc_struct(sys_props.kobj_topology);
 		if (!sys_props.kobj_topology)
@@ -1120,7 +1120,7 @@ static struct kfd_topology_device *kfd_assign_gpu(struct kfd_dev *gpu)
 	BUG_ON(!gpu);
 
 	list_for_each_entry(dev, &topology_device_list, list)
-		if (dev->gpu == NULL && dev->node_props.simd_count > 0) {
+		if (!dev->gpu && (dev->node_props.simd_count > 0)) {
 			dev->gpu = gpu;
 			out_dev = dev;
 			break;