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Subject[PATCH 4.18 180/197] drm/amdgpu: fix incorrect use of drm_file->pid
Date
4.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Christian König <christian.koenig@amd.com>

commit c4aed87630d41ee54e2ee23d4583c3dd423296dd upstream.

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
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/gpu/drm/amd/amdgpu/amdgpu_sched.c | 19 ++++---------------
1 file changed, 4 insertions(+), 15 deletions(-)

--- 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
{
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
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);


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