drm/amdgpu: fix incorrect use of drm_file->pid

That's the PID of the creator of the file (usually the X server) and not
the end user of the file.

Signed-off-by: Christian König <christian.koenig@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
CC: stable@vger.kernel.org

1 files changed, 4 insertions, 15 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_sched.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_sched.c
index cb62a90d0686..1cafe8d83a4d 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_sched.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_sched.c
@@ -55,7 +55,6 @@ static int amdgpu_sched_process_priority_override(struct amdgpu_device *adev,
 {
         struct file *filp = fget(fd);
         struct drm_file *file;
-        struct pid *pid;
         struct amdgpu_fpriv *fpriv;
         struct amdgpu_ctx *ctx;
         uint32_t id;
@@ -63,20 +62,10 @@ static int amdgpu_sched_process_priority_override(struct amdgpu_device *adev,
         if (!filp)
                 return -EINVAL;
 
-        pid = get_pid(((struct drm_file *)filp->private_data)->pid);
-
-        mutex_lock(&adev->ddev->filelist_mutex);
-        list_for_each_entry(file, &adev->ddev->filelist, lhead) {
-                if (file->pid != pid)
-                        continue;
-
-                fpriv = file->driver_priv;
-                idr_for_each_entry(&fpriv->ctx_mgr.ctx_handles, ctx, id)
-                                amdgpu_ctx_priority_override(ctx, priority);
-        }
-        mutex_unlock(&adev->ddev->filelist_mutex);
-
-        put_pid(pid);
+        file = filp->private_data;
+        fpriv = file->driver_priv;
+        idr_for_each_entry(&fpriv->ctx_mgr.ctx_handles, ctx, id)
+                amdgpu_ctx_priority_override(ctx, priority);
 
         fput(filp);