From: Christian König <christian.koenig@amd.com>
Date: Sat, 18 Jul 2015 17:20:05 +0000 (+0200)
Subject: drm/amdgpu: fix signed overrun in amdgpu_ctx_get_fence
X-Git-Tag: v4.3-rc1~75^2~22^2~113
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=cf6f1d39496e9b5dd62953f8dca9f995d80ab4ff;p=karo-tx-linux.git

drm/amdgpu: fix signed overrun in amdgpu_ctx_get_fence

Otherwise the first 16 fences of a context will always signal immediately.

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Jammy Zhou <Jammy.Zhou@amd.com>
---

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ctx.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ctx.c
index 859a4841075e..144edc97c6fe 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ctx.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ctx.c
@@ -226,7 +226,7 @@ struct fence *amdgpu_ctx_get_fence(struct amdgpu_ctx *ctx,
 		return ERR_PTR(-EINVAL);
 	}
 
-	if (seq < cring->sequence - AMDGPU_CTX_MAX_CS_PENDING) {
+	if (seq + AMDGPU_CTX_MAX_CS_PENDING < cring->sequence) {
 		spin_unlock(&ctx->ring_lock);
 		return NULL;
 	}