[PATCH 3/6] drm/amdgpu: allocate progressively higher ids for ctx until idr counter wraps

From: Chunming Zhou <David1.Zhou-5C7GfCeVMHo@public.gmane.org>
To: amd-gfx-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org
Cc: Chunming Zhou <David1.Zhou-5C7GfCeVMHo@public.gmane.org>,
	David.Mao-5C7GfCeVMHo@public.gmane.org
Subject: [PATCH 3/6] drm/amdgpu: allocate progressively higher ids for ctx until idr counter wraps
Date: Thu, 18 Aug 2016 15:50:15 +0800	[thread overview]
Message-ID: <1471506618-29849-4-git-send-email-David1.Zhou@amd.com> (raw)
In-Reply-To: <1471506618-29849-1-git-send-email-David1.Zhou-5C7GfCeVMHo@public.gmane.org>

Change-Id: I0e36d8b842a29b67afcc411330700238b428e746
Signed-off-by: Chunming Zhou <David1.Zhou@amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_ctx.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ctx.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ctx.c
index 963a14e..35761bd 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ctx.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ctx.c
@@ -97,7 +97,8 @@ static int amdgpu_ctx_alloc(struct amdgpu_device *adev,
 		return -ENOMEM;
 
 	mutex_lock(&amdgpu_ctx_lock);
-	r = idr_alloc(&amdgpu_ctx_idr, ctx, 1, 0, GFP_KERNEL);
+	/* allocate progressively higher ids until idr counter wraps */
+	r = idr_alloc_cyclic(&amdgpu_ctx_idr, ctx, 1, 0, GFP_KERNEL);
 	if (r < 0) {
 		mutex_unlock(&amdgpu_ctx_lock);
 		kfree(ctx);
-- 
1.9.1

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