[PATCH 4/7] drm/amdkfd: Make kfd_lookup_process_by_pasid() well defined

[Edward O'Callaghan]

Ensure we return a NULL on the fail branch so that the call
site may BUG_ON() it.

Signed-off-by: Edward O'Callaghan <funfunctor at folklore1984.net>
---
 drivers/gpu/drm/amd/amdkfd/kfd_process.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_process.c b/drivers/gpu/drm/amd/amdkfd/kfd_process.c
index 4f3849a..8d78052 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_process.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_process.c
@@ -481,13 +481,14 @@ bool kfd_has_process_device_data(struct kfd_process *p)
 /* This returns with process->mutex locked. */
 struct kfd_process *kfd_lookup_process_by_pasid(unsigned int pasid)
 {
-	struct kfd_process *p;
+	struct kfd_process *p, *ret_p = NULL;
 	unsigned int temp;
 
 	int idx = srcu_read_lock(&kfd_processes_srcu);
 
 	hash_for_each_rcu(kfd_processes_table, temp, p, kfd_processes) {
 		if (p->pasid == pasid) {
+			ret_p = p;
 			mutex_lock(&p->mutex);
 			break;
 		}
@@ -495,5 +496,5 @@ struct kfd_process *kfd_lookup_process_by_pasid(unsigned int pasid)
 
 	srcu_read_unlock(&kfd_processes_srcu, idx);
 
-	return p;
+	return ret_p;
 }
-- 
2.7.4