linux-kernel - [PATCH][next] drm/amdgpu: fix off-by-one comparison on a WARN

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Message-Id: <20190628140801.31937-1-colin.king@canonical.com>
Date:   Fri, 28 Jun 2019 15:08:01 +0100
From:   Colin King <colin.king@...onical.com>
To:     Hawking Zhang <Hawking.Zhang@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>,
        David Zhou <David1.Zhou@....com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>, amd-gfx@...ts.freedesktop.org,
        dri-devel@...ts.freedesktop.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH][next] drm/amdgpu: fix off-by-one comparison on a WARN_ON message

From: Colin Ian King <colin.king@...onical.com>

The WARN_ON is currently throwing a warning when i is 65 or higher which
is off by one. It should be 64 or higher (64 queues from 0..63 inclusive),
so fix this off-by-one comparison.

Fixes: 849aca9f9c03 ("drm/amdgpu: Move common code to amdgpu_gfx.c")
Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c
index 74066e1466f7..c8d106c59e27 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c
@@ -501,7 +501,7 @@ int amdgpu_gfx_enable_kcq(struct amdgpu_device *adev)
 		/* This situation may be hit in the future if a new HW
 		 * generation exposes more than 64 queues. If so, the
 		 * definition of queue_mask needs updating */
-		if (WARN_ON(i > (sizeof(queue_mask)*8))) {
+		if (WARN_ON(i >= (sizeof(queue_mask)*8))) {
 			DRM_ERROR("Invalid KCQ enabled: %d\n", i);
 			break;
 		}
-- 
2.20.1