linux-kernel - [PATCH] amdgpu: fix integer overflow on 32-bit architectures

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Date:   Tue,  5 May 2020 16:15:59 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>,
        "David (ChunMing) Zhou" <David1.Zhou@....com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>, Evan Quan <evan.quan@....com>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Hawking Zhang <Hawking.Zhang@....com>,
        Andrey Grodzovsky <andrey.grodzovsky@....com>,
        Monk Liu <Monk.Liu@....com>,
        Kent Russell <kent.russell@....com>,
        amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, clang-built-linux@...glegroups.com
Subject: [PATCH] amdgpu: fix integer overflow on 32-bit architectures

Multiplying 1000000000 by four overruns a 'long' variable, as clang
points out:

drivers/gpu/drm/amd/amdgpu/amdgpu_device.c:4160:53: error: overflow in expression; result is -294967296 with type 'long' [-Werror,-Winteger-overflow]
                expires = ktime_get_mono_fast_ns() + NSEC_PER_SEC * 4L;
                                                                  ^
Make this a 'long long' constant instead.

Fixes: 3f12acc8d6d4 ("drm/amdgpu: put the audio codec into suspend state before gpu reset V3")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
I'm not sure the ktime_get_mono_fast_ns() call is necessary here
either. Is it intentional because ktime_get_ns() doesn't work
during a driver suspend, or just a mistake?
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index 6f93af972b0a..2e07e3e6b036 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -4157,7 +4157,7 @@ static int amdgpu_device_suspend_display_audio(struct amdgpu_device *adev)
 		 * the audio controller default autosuspend delay setting.
 		 * 4S used here is guaranteed to cover that.
 		 */
-		expires = ktime_get_mono_fast_ns() + NSEC_PER_SEC * 4L;
+		expires = ktime_get_mono_fast_ns() + NSEC_PER_SEC * 4LL;
 
 	while (!pm_runtime_status_suspended(&(p->dev))) {
 		if (!pm_runtime_suspend(&(p->dev)))
-- 
2.26.0