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From 802a54cf49c75ff4b00065cc30e227be1ba01003 Mon Sep 17 00:00:00 2001
From: Yong Zhao <yong.zhao@amd.com>
Date: Mon, 27 Nov 2017 18:29:53 -0500
Subject: [PATCH 3410/4131] drm/amdkfd: Return NULL if
kfd_lookup_process_by_pasid fails
If no matching process is found, return NULL instead of a pointer
to the last process in the kfd_processes_table.
Signed-off-by: Yong Zhao <yong.zhao@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_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 509f987..93f9019 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_process.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_process.c
@@ -570,7 +570,7 @@ bool kfd_has_process_device_data(struct kfd_process *p)
/* This increments the process->ref counter. */
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);
@@ -578,13 +578,14 @@ struct kfd_process *kfd_lookup_process_by_pasid(unsigned int pasid)
hash_for_each_rcu(kfd_processes_table, temp, p, kfd_processes) {
if (p->pasid == pasid) {
kref_get(&p->ref);
+ ret_p = p;
break;
}
}
srcu_read_unlock(&kfd_processes_srcu, idx);
- return p;
+ return ret_p;
}
int kfd_reserved_mem_mmap(struct kfd_process *process,
--
2.7.4
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