In most cases, BUG_ONs can be replaced with WARN_ON with an error
return. In some void functions just turn them into a WARN_ON and
possibly an early exit.

Signed-off-by: Felix Kuehling <felix.kuehl...@amd.com>
---
 drivers/gpu/drm/amd/amdkfd/kfd_dbgdev.c            |  3 +-
 drivers/gpu/drm/amd/amdkfd/kfd_dbgmgr.c            |  3 +-
 drivers/gpu/drm/amd/amdkfd/kfd_device.c            | 16 ++++----
 .../gpu/drm/amd/amdkfd/kfd_device_queue_manager.c  | 19 ++++-----
 .../drm/amd/amdkfd/kfd_device_queue_manager_cik.c  |  2 +-
 .../drm/amd/amdkfd/kfd_device_queue_manager_vi.c   |  2 +-
 drivers/gpu/drm/amd/amdkfd/kfd_kernel_queue.c      | 20 +++++++---
 drivers/gpu/drm/amd/amdkfd/kfd_mqd_manager_cik.c   |  3 +-
 drivers/gpu/drm/amd/amdkfd/kfd_mqd_manager_vi.c    |  3 +-
 drivers/gpu/drm/amd/amdkfd/kfd_packet_manager.c    | 45 +++++++++++++---------
 drivers/gpu/drm/amd/amdkfd/kfd_pasid.c             |  4 +-
 drivers/gpu/drm/amd/amdkfd/kfd_process.c           |  9 ++---
 .../gpu/drm/amd/amdkfd/kfd_process_queue_manager.c |  7 ++--
 drivers/gpu/drm/amd/amdkfd/kfd_topology.c          |  4 +-
 14 files changed, 84 insertions(+), 56 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_dbgdev.c 
b/drivers/gpu/drm/amd/amdkfd/kfd_dbgdev.c
index 3841cad..0aa021a 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_dbgdev.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_dbgdev.c
@@ -60,7 +60,8 @@ static int dbgdev_diq_submit_ib(struct kfd_dbgdev *dbgdev,
        unsigned int *ib_packet_buff;
        int status;
 
-       BUG_ON(!size_in_bytes);
+       if (WARN_ON(!size_in_bytes))
+               return -EINVAL;
 
        kq = dbgdev->kq;
 
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_dbgmgr.c 
b/drivers/gpu/drm/amd/amdkfd/kfd_dbgmgr.c
index 2d5555c..3da25f7 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_dbgmgr.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_dbgmgr.c
@@ -64,7 +64,8 @@ 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->init_complete);
+       if (WARN_ON(!pdev->init_complete))
+               return false;
 
        new_buff = kfd_alloc_struct(new_buff);
        if (!new_buff) {
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_device.c 
b/drivers/gpu/drm/amd/amdkfd/kfd_device.c
index 416955f..f628ac3 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_device.c
+++ b/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);
+                       WARN_ON(!supported_devices[i].device_info);
                        return supported_devices[i].device_info;
                }
        }
@@ -212,9 +212,8 @@ static int iommu_invalid_ppr_cb(struct pci_dev *pdev, int 
pasid,
                        flags);
 
        dev = kfd_device_by_pci_dev(pdev);
-       BUG_ON(!dev);
-
-       kfd_signal_iommu_event(dev, pasid, address,
+       if (!WARN_ON(!dev))
+               kfd_signal_iommu_event(dev, pasid, address,
                        flags & PPR_FAULT_WRITE, flags & PPR_FAULT_EXEC);
 
        return AMD_IOMMU_INV_PRI_RSP_INVALID;
@@ -397,9 +396,12 @@ static int kfd_gtt_sa_init(struct kfd_dev *kfd, unsigned 
int buf_size,
 {
        unsigned int num_of_longs;
 
-       BUG_ON(buf_size < chunk_size);
-       BUG_ON(buf_size == 0);
-       BUG_ON(chunk_size == 0);
+       if (WARN_ON(buf_size < chunk_size))
+               return -EINVAL;
+       if (WARN_ON(buf_size == 0))
+               return -EINVAL;
+       if (WARN_ON(chunk_size == 0))
+               return -EINVAL;
 
        kfd->gtt_sa_chunk_size = chunk_size;
        kfd->gtt_sa_num_of_chunks = buf_size / chunk_size;
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c 
b/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c
index 43bc1b5..5dac29d 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c
@@ -386,7 +386,8 @@ static struct mqd_manager *get_mqd_manager_nocpsch(
 {
        struct mqd_manager *mqd;
 
-       BUG_ON(type >= KFD_MQD_TYPE_MAX);
+       if (WARN_ON(type >= KFD_MQD_TYPE_MAX))
+               return NULL;
 
        pr_debug("mqd type %d\n", type);
 
@@ -511,7 +512,7 @@ static void uninitialize_nocpsch(struct 
device_queue_manager *dqm)
 {
        int i;
 
-       BUG_ON(dqm->queue_count > 0 || dqm->processes_count > 0);
+       WARN_ON(dqm->queue_count > 0 || dqm->processes_count > 0);
 
        kfree(dqm->allocated_queues);
        for (i = 0 ; i < KFD_MQD_TYPE_MAX ; i++)
@@ -1127,8 +1128,8 @@ struct device_queue_manager 
*device_queue_manager_init(struct kfd_dev *dev)
                dqm->ops.set_cache_memory_policy = set_cache_memory_policy;
                break;
        default:
-               BUG();
-               break;
+               pr_err("Invalid scheduling policy %d\n", sched_policy);
+               goto out_free;
        }
 
        switch (dev->device_info->asic_family) {
@@ -1141,12 +1142,12 @@ struct device_queue_manager 
*device_queue_manager_init(struct kfd_dev *dev)
                break;
        }
 
-       if (dqm->ops.initialize(dqm)) {
-               kfree(dqm);
-               return NULL;
-       }
+       if (!dqm->ops.initialize(dqm))
+               return dqm;
 
-       return dqm;
+out_free:
+       kfree(dqm);
+       return NULL;
 }
 
 void device_queue_manager_uninit(struct device_queue_manager *dqm)
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager_cik.c 
b/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager_cik.c
index 43194b4..fadc56a 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager_cik.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager_cik.c
@@ -65,7 +65,7 @@ static uint32_t compute_sh_mem_bases_64bit(unsigned int 
top_address_nybble)
         * for LDS/Scratch and GPUVM.
         */
 
-       BUG_ON((top_address_nybble & 1) || top_address_nybble > 0xE ||
+       WARN_ON((top_address_nybble & 1) || top_address_nybble > 0xE ||
                top_address_nybble == 0);
 
        return PRIVATE_BASE(top_address_nybble << 12) |
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager_vi.c 
b/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager_vi.c
index 47ef910..15e81ae 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager_vi.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager_vi.c
@@ -67,7 +67,7 @@ static uint32_t compute_sh_mem_bases_64bit(unsigned int 
top_address_nybble)
         * for LDS/Scratch and GPUVM.
         */
 
-       BUG_ON((top_address_nybble & 1) || top_address_nybble > 0xE ||
+       WARN_ON((top_address_nybble & 1) || top_address_nybble > 0xE ||
                top_address_nybble == 0);
 
        return top_address_nybble << 12 |
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_kernel_queue.c 
b/drivers/gpu/drm/amd/amdkfd/kfd_kernel_queue.c
index 970bc07..0e4d4a9 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_kernel_queue.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_kernel_queue.c
@@ -41,7 +41,8 @@ static bool initialize(struct kernel_queue *kq, struct 
kfd_dev *dev,
        int retval;
        union PM4_MES_TYPE_3_HEADER nop;
 
-       BUG_ON(type != KFD_QUEUE_TYPE_DIQ && type != KFD_QUEUE_TYPE_HIQ);
+       if (WARN_ON(type != KFD_QUEUE_TYPE_DIQ && type != KFD_QUEUE_TYPE_HIQ))
+               return false;
 
        pr_debug("Initializing queue type %d size %d\n", KFD_QUEUE_TYPE_HIQ,
                        queue_size);
@@ -62,8 +63,8 @@ static bool initialize(struct kernel_queue *kq, struct 
kfd_dev *dev,
                                                KFD_MQD_TYPE_HIQ);
                break;
        default:
-               BUG();
-               break;
+               pr_err("Invalid queue type %d\n", type);
+               return false;
        }
 
        if (!kq->mqd)
@@ -305,6 +306,7 @@ void kernel_queue_uninit(struct kernel_queue *kq)
        kfree(kq);
 }
 
+/* FIXME: Can this test be removed? */
 static __attribute__((unused)) void test_kq(struct kfd_dev *dev)
 {
        struct kernel_queue *kq;
@@ -314,10 +316,18 @@ static __attribute__((unused)) void test_kq(struct 
kfd_dev *dev)
        pr_err("Starting kernel queue test\n");
 
        kq = kernel_queue_init(dev, KFD_QUEUE_TYPE_HIQ);
-       BUG_ON(!kq);
+       if (unlikely(!kq)) {
+               pr_err("  Failed to initialize HIQ\n");
+               pr_err("Kernel queue test failed\n");
+               return;
+       }
 
        retval = kq->ops.acquire_packet_buffer(kq, 5, &buffer);
-       BUG_ON(retval != 0);
+       if (unlikely(retval != 0)) {
+               pr_err("  Failed to acquire packet buffer\n");
+               pr_err("Kernel queue test failed\n");
+               return;
+       }
        for (i = 0; i < 5; i++)
                buffer[i] = kq->nop_packet;
        kq->ops.submit_packet(kq);
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_mqd_manager_cik.c 
b/drivers/gpu/drm/amd/amdkfd/kfd_mqd_manager_cik.c
index a11477d..7e0ec6b 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_mqd_manager_cik.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_mqd_manager_cik.c
@@ -387,7 +387,8 @@ struct mqd_manager *mqd_manager_init_cik(enum KFD_MQD_TYPE 
type,
 {
        struct mqd_manager *mqd;
 
-       BUG_ON(type >= KFD_MQD_TYPE_MAX);
+       if (WARN_ON(type >= KFD_MQD_TYPE_MAX))
+               return NULL;
 
        mqd = kzalloc(sizeof(*mqd), GFP_KERNEL);
        if (!mqd)
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_mqd_manager_vi.c 
b/drivers/gpu/drm/amd/amdkfd/kfd_mqd_manager_vi.c
index d638c2c..f4c8c23 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_mqd_manager_vi.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_mqd_manager_vi.c
@@ -233,7 +233,8 @@ struct mqd_manager *mqd_manager_init_vi(enum KFD_MQD_TYPE 
type,
 {
        struct mqd_manager *mqd;
 
-       BUG_ON(type >= KFD_MQD_TYPE_MAX);
+       if (WARN_ON(type >= KFD_MQD_TYPE_MAX))
+               return NULL;
 
        mqd = kzalloc(sizeof(*mqd), GFP_KERNEL);
        if (!mqd)
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_packet_manager.c 
b/drivers/gpu/drm/amd/amdkfd/kfd_packet_manager.c
index aacd5a3..77a6f2b 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_packet_manager.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_packet_manager.c
@@ -35,7 +35,8 @@ static inline void inc_wptr(unsigned int *wptr, unsigned int 
increment_bytes,
 {
        unsigned int temp = *wptr + increment_bytes / sizeof(uint32_t);
 
-       BUG_ON((temp * sizeof(uint32_t)) > buffer_size_bytes);
+       WARN((temp * sizeof(uint32_t)) > buffer_size_bytes,
+            "Runlist IB overflow");
        *wptr = temp;
 }
 
@@ -94,7 +95,8 @@ static int pm_allocate_runlist_ib(struct packet_manager *pm,
 {
        int retval;
 
-       BUG_ON(pm->allocated);
+       if (WARN_ON(pm->allocated))
+               return -EINVAL;
 
        pm_calc_rlib_size(pm, rl_buffer_size, is_over_subscription);
 
@@ -119,7 +121,8 @@ static int pm_create_runlist(struct packet_manager *pm, 
uint32_t *buffer,
 {
        struct pm4_runlist *packet;
 
-       BUG_ON(!ib);
+       if (WARN_ON(!ib))
+               return -EFAULT;
 
        packet = (struct pm4_runlist *)buffer;
 
@@ -211,9 +214,8 @@ static int pm_create_map_queue_vi(struct packet_manager 
*pm, uint32_t *buffer,
                use_static = false; /* no static queues under SDMA */
                break;
        default:
-               pr_err("queue type %d\n", q->properties.type);
-               BUG();
-               break;
+               WARN(1, "queue type %d", q->properties.type);
+               return -EINVAL;
        }
        packet->bitfields3.doorbell_offset =
                        q->properties.doorbell_off;
@@ -266,8 +268,8 @@ static int pm_create_map_queue(struct packet_manager *pm, 
uint32_t *buffer,
                use_static = false; /* no static queues under SDMA */
                break;
        default:
-               BUG();
-               break;
+               WARN(1, "queue type %d", q->properties.type);
+               return -EINVAL;
        }
 
        packet->mes_map_queues_ordinals[0].bitfields3.doorbell_offset =
@@ -392,14 +394,16 @@ static int pm_create_runlist_ib(struct packet_manager *pm,
        pr_debug("Finished map process and queues to runlist\n");
 
        if (is_over_subscription)
-               pm_create_runlist(pm, &rl_buffer[rl_wptr], *rl_gpu_addr,
-                               alloc_size_bytes / sizeof(uint32_t), true);
+               retval = pm_create_runlist(pm, &rl_buffer[rl_wptr],
+                                       *rl_gpu_addr,
+                                       alloc_size_bytes / sizeof(uint32_t),
+                                       true);
 
        for (i = 0; i < alloc_size_bytes / sizeof(uint32_t); i++)
                pr_debug("0x%2X ", rl_buffer[i]);
        pr_debug("\n");
 
-       return 0;
+       return retval;
 }
 
 int pm_init(struct packet_manager *pm, struct device_queue_manager *dqm)
@@ -512,7 +516,8 @@ int pm_send_query_status(struct packet_manager *pm, 
uint64_t fence_address,
        int retval;
        struct pm4_query_status *packet;
 
-       BUG_ON(!fence_address);
+       if (WARN_ON(!fence_address))
+               return -EFAULT;
 
        mutex_lock(&pm->lock);
        retval = pm->priv_queue->ops.acquire_packet_buffer(
@@ -577,8 +582,9 @@ int pm_send_unmap_queue(struct packet_manager *pm, enum 
kfd_queue_type type,
                        engine_sel__mes_unmap_queues__sdma0 + sdma_engine;
                break;
        default:
-               BUG();
-               break;
+               WARN(1, "queue type %d", type);
+               retval = -EINVAL;
+               goto err_invalid;
        }
 
        if (reset)
@@ -610,12 +616,15 @@ int pm_send_unmap_queue(struct packet_manager *pm, enum 
kfd_queue_type type,
                                
queue_sel__mes_unmap_queues__perform_request_on_dynamic_queues_only;
                break;
        default:
-               BUG();
-               break;
+               WARN(1, "filter %d", mode);
+               retval = -EINVAL;
        }
 
-       pm->priv_queue->ops.submit_packet(pm->priv_queue);
-
+err_invalid:
+       if (!retval)
+               pm->priv_queue->ops.submit_packet(pm->priv_queue);
+       else
+               pm->priv_queue->ops.rollback_packet(pm->priv_queue);
 err_acquire_packet_buffer:
        mutex_unlock(&pm->lock);
        return retval;
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_pasid.c 
b/drivers/gpu/drm/amd/amdkfd/kfd_pasid.c
index b3f7d43..1e06de0 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_pasid.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_pasid.c
@@ -92,6 +92,6 @@ unsigned int kfd_pasid_alloc(void)
 
 void kfd_pasid_free(unsigned int pasid)
 {
-       BUG_ON(pasid == 0 || pasid >= pasid_limit);
-       clear_bit(pasid, pasid_bitmap);
+       if (!WARN_ON(pasid == 0 || pasid >= pasid_limit))
+               clear_bit(pasid, pasid_bitmap);
 }
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_process.c 
b/drivers/gpu/drm/amd/amdkfd/kfd_process.c
index d030d76..41a9976 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_process.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_process.c
@@ -79,8 +79,6 @@ struct kfd_process *kfd_create_process(const struct 
task_struct *thread)
 {
        struct kfd_process *process;
 
-       BUG_ON(!kfd_process_wq);
-
        if (!thread->mm)
                return ERR_PTR(-EINVAL);
 
@@ -202,10 +200,10 @@ static void kfd_process_destroy_delayed(struct rcu_head 
*rcu)
        struct kfd_process_release_work *work;
        struct kfd_process *p;
 
-       BUG_ON(!kfd_process_wq);
+       WARN_ON(!kfd_process_wq);
 
        p = container_of(rcu, struct kfd_process, rcu);
-       BUG_ON(atomic_read(&p->mm->mm_count) <= 0);
+       WARN_ON(atomic_read(&p->mm->mm_count) <= 0);
 
        mmdrop(p->mm);
 
@@ -229,7 +227,8 @@ static void kfd_process_notifier_release(struct 
mmu_notifier *mn,
         * mmu_notifier srcu is read locked
         */
        p = container_of(mn, struct kfd_process, mmu_notifier);
-       BUG_ON(p->mm != mm);
+       if (WARN_ON(p->mm != mm))
+               return;
 
        mutex_lock(&kfd_processes_mutex);
        hash_del_rcu(&p->kfd_processes);
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_process_queue_manager.c 
b/drivers/gpu/drm/amd/amdkfd/kfd_process_queue_manager.c
index f6ecdff..1cae95e 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_process_queue_manager.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_process_queue_manager.c
@@ -218,8 +218,8 @@ int pqm_create_queue(struct process_queue_manager *pqm,
                                                        kq, &pdd->qpd);
                break;
        default:
-               BUG();
-               break;
+               WARN(1, "Invalid queue type %d", type);
+               retval = -EINVAL;
        }
 
        if (retval != 0) {
@@ -272,7 +272,8 @@ int pqm_destroy_queue(struct process_queue_manager *pqm, 
unsigned int qid)
                dev = pqn->kq->dev;
        if (pqn->q)
                dev = pqn->q->device;
-       BUG_ON(!dev);
+       if (WARN_ON(!dev))
+               return -ENODEV;
 
        pdd = kfd_get_process_device_data(dev, pqm->process);
        if (!pdd) {
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_topology.c 
b/drivers/gpu/drm/amd/amdkfd/kfd_topology.c
index e5486f4..19ce590 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_topology.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_topology.c
@@ -799,10 +799,12 @@ static int kfd_build_sysfs_node_entry(struct 
kfd_topology_device *dev,
        int ret;
        uint32_t i;
 
+       if (WARN_ON(dev->kobj_node))
+               return -EEXIST;
+
        /*
         * Creating the sysfs folders
         */
-       BUG_ON(dev->kobj_node);
        dev->kobj_node = kfd_alloc_struct(dev->kobj_node);
        if (!dev->kobj_node)
                return -ENOMEM;
-- 
2.7.4

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