Patch "drm/amdgpu: add a missing lock for AMDGPU_SCHED" has been added to the 5.15-stable tree

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This is a note to let you know that I've just added the patch titled

    drm/amdgpu: add a missing lock for AMDGPU_SCHED

to the 5.15-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     drm-amdgpu-add-a-missing-lock-for-amdgpu_sched.patch
and it can be found in the queue-5.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 1c0beccd21683d2a495d7c7ac3330dc7488ab94e
Author: Chia-I Wu <olvaffe@xxxxxxxxx>
Date:   Wed Apr 26 15:54:55 2023 -0700

    drm/amdgpu: add a missing lock for AMDGPU_SCHED
    
    [ Upstream commit 2397e3d8d2e120355201a8310b61929f5a8bd2c0 ]
    
    mgr->ctx_handles should be protected by mgr->lock.
    
    v2: improve commit message
    v3: add a Fixes tag
    
    Signed-off-by: Chia-I Wu <olvaffe@xxxxxxxxx>
    Reviewed-by: Christian König <christian.koenig@xxxxxxx>
    Fixes: 52c6a62c64fa ("drm/amdgpu: add interface for editing a foreign process's priority v3")
    Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_sched.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_sched.c
index b7d861ed52849..88f986a61c93a 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_sched.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_sched.c
@@ -66,6 +66,7 @@ static int amdgpu_sched_process_priority_override(struct amdgpu_device *adev,
 {
 	struct fd f = fdget(fd);
 	struct amdgpu_fpriv *fpriv;
+	struct amdgpu_ctx_mgr *mgr;
 	struct amdgpu_ctx *ctx;
 	uint32_t id;
 	int r;
@@ -79,8 +80,11 @@ static int amdgpu_sched_process_priority_override(struct amdgpu_device *adev,
 		return r;
 	}
 
-	idr_for_each_entry(&fpriv->ctx_mgr.ctx_handles, ctx, id)
+	mgr = &fpriv->ctx_mgr;
+	mutex_lock(&mgr->lock);
+	idr_for_each_entry(&mgr->ctx_handles, ctx, id)
 		amdgpu_ctx_priority_override(ctx, priority);
+	mutex_unlock(&mgr->lock);
 
 	fdput(f);
 	return 0;



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