Increment the kfd_process.lead_thread's reference counter to make it safe to dereference. This is needed for getting a safe reference to the process' mm_struct. Signed-off-by: Felix Kuehling <Felix.Kuehling at amd.com> --- drivers/gpu/drm/amd/amdkfd/kfd_process.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_process.c b/drivers/gpu/drm/amd/amdkfd/kfd_process.c index 99c18ee..660d8bc 100644 --- a/drivers/gpu/drm/amd/amdkfd/kfd_process.c +++ b/drivers/gpu/drm/amd/amdkfd/kfd_process.c @@ -24,6 +24,7 @@ #include <linux/log2.h> #include <linux/sched.h> #include <linux/sched/mm.h> +#include <linux/sched/task.h> #include <linux/slab.h> #include <linux/amd-iommu.h> #include <linux/notifier.h> @@ -191,6 +192,8 @@ static void kfd_process_wq_release(struct work_struct *work) mutex_destroy(&p->mutex); + put_task_struct(p->lead_thread); + kfree(p); kfree(work); @@ -342,6 +345,7 @@ static struct kfd_process *create_process(const struct task_struct *thread) (uintptr_t)process->mm); process->lead_thread = thread->group_leader; + get_task_struct(process->lead_thread); INIT_LIST_HEAD(&process->per_device_data); -- 2.7.4
