[PATCH v2] drm/amdkfd: validate pdd where it acquired first

[Maninder Singh]

Currently pdd is validate after dereferencing it, which is
not correct, Thus validate pdd before its first use.

Signed-off-by: Maninder Singh <maninder1.s at samsung.com>
---
v1: remove validation of pdd after its usage
v2: do validation at first place rather than removing

 drivers/gpu/drm/amd/amdkfd/kfd_process.c |    9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_process.c 
b/drivers/gpu/drm/amd/amdkfd/kfd_process.c
index 8a1f999..9be0070 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_process.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_process.c
@@ -420,6 +420,12 @@ void kfd_unbind_process_from_device(struct kfd_dev *dev, 
unsigned int pasid)
        pqm_uninit(&p->pqm);

        pdd = kfd_get_process_device_data(dev, p);
+
+       if (!pdd) {
+               mutex_unlock(&p->mutex);
+               return;
+       }
+
        if (pdd->reset_wavefronts) {
                dbgdev_wave_reset_wavefronts(pdd->dev, p);
                pdd->reset_wavefronts = false;
@@ -431,8 +437,7 @@ void kfd_unbind_process_from_device(struct kfd_dev *dev, 
unsigned int pasid)
         * We don't call amd_iommu_unbind_pasid() here
         * because the IOMMU called us.
         */
-       if (pdd)
-               pdd->bound = false;
+       pdd->bound = false;

        mutex_unlock(&p->mutex);
 }
-- 
1.7.9.5