nvgpu: fix resource leaks when cleaning up

In gk20a_free_channel, destroy notifier_wq and
semaphore_wq

In __nvgpu_vm_remove, destroy the update_gmmu_lock mutex

Bug 200647668

Change-Id: Icbb4e626c0fa9fa2dcf1430b3112b51829b00e4f
Signed-off-by: Peter Daifuku <pdaifuku@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2414820
Reviewed-by: automaticguardword <automaticguardword@nvidia.com>
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Shashank Singh <shashsingh@nvidia.com>
Reviewed-by: Alex Waterman <alexw@nvidia.com>
Reviewed-by: Satish Arora <satisha@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
GVS: Gerrit_Virtual_Submit
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

drivers/gpu/nvgpu/common/fifo/channel.c

@@ -1,7 +1,7 @@
 /*
  * GK20A Graphics channel
  *
- * Copyright (c) 2011-2019, NVIDIA CORPORATION.  All rights reserved.
+ * Copyright (c) 2011-2020, NVIDIA CORPORATION.  All rights reserved.
  *
  * Permission is hereby granted, free of charge, to any person obtaining a
  * copy of this software and associated documentation files (the "Software"),
@@ -512,6 +512,9 @@ unbind:
 	ch->ref_actions_put = 0;
 #endif
 
+	nvgpu_cond_destroy(&ch->notifier_wq);
+	nvgpu_cond_destroy(&ch->semaphore_wq);
+
 	/* make sure we catch accesses of unopened channels in case
 	 * there's non-refcounted channel pointers hanging around */
 	ch->g = NULL;

drivers/gpu/nvgpu/common/mm/vm.c

@@ -658,6 +658,7 @@ static void __nvgpu_vm_remove(struct vm_gk20a *vm)
 #endif
 
 	nvgpu_mutex_release(&vm->update_gmmu_lock);
+	nvgpu_mutex_destroy(&vm->update_gmmu_lock);
 
 	nvgpu_mutex_destroy(&vm->syncpt_ro_map_lock);
 	nvgpu_kfree(g, vm);