Merge tag 'amd-drm-fixes-6.17-2025-07-31' of https://gitlab.freedesktop.org/agd5f/linux into drm-next

amd-drm-fixes-6.17-2025-07-31:

amdgpu:
- DSC divide by 0 fix
- clang fix
- DC debugfs fix
- Userq fixes
- Avoid extra evict-restore with KFD
- Backlight fix
- Documentation fix
- RAS fix
- Add new kicker handling
- DSC fix for DCN 3.1.4
- PSR fix
- Atomic fix
- DC reset fixes
- DCN 3.0.1 fix
- MMHUB client mapping fix

Signed-off-by: Dave Airlie <[email protected]>

From: Alex Deucher <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

1 files changed, 4 insertions, 2 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_cper.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_cper.c
index 15dde1f50328..25252231a68a 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_cper.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_cper.c
@@ -459,7 +459,7 @@ calc:
 
 void amdgpu_cper_ring_write(struct amdgpu_ring *ring, void *src, int count)
 {
-	u64 pos, wptr_old, rptr = *ring->rptr_cpu_addr & ring->ptr_mask;
+	u64 pos, wptr_old, rptr;
 	int rec_cnt_dw = count >> 2;
 	u32 chunk, ent_sz;
 	u8 *s = (u8 *)src;
@@ -472,9 +472,11 @@ void amdgpu_cper_ring_write(struct amdgpu_ring *ring, void *src, int count)
 		return;
 	}
 
+	mutex_lock(&ring->adev->cper.ring_lock);
+
 	wptr_old = ring->wptr;
+	rptr = *ring->rptr_cpu_addr & ring->ptr_mask;
 
-	mutex_lock(&ring->adev->cper.ring_lock);
 	while (count) {
 		ent_sz = amdgpu_cper_ring_get_ent_sz(ring, ring->wptr);
 		chunk = umin(ent_sz, count);