linux-kernel - [PATCH] drm/radeon: do not left queue acquired if timeout happens in kgd_hqd

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Message-Id: <1420327880-25415-1-git-send-email-khoroshilov@ispras.ru>
Date:	Sun,  4 Jan 2015 02:31:20 +0300
From:	Alexey Khoroshilov <khoroshilov@...ras.ru>
To:	Oded Gabbay <oded.gabbay@....com>
Cc:	Alexey Khoroshilov <khoroshilov@...ras.ru>,
	Alex Deucher <alexander.deucher@....com>,
	Christian König <christian.koenig@....com>,
	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
	ldv-project@...uxtesting.org
Subject: [PATCH] drm/radeon: do not left queue acquired if timeout happens in kgd_hqd_destroy()

If timeout happens, kgd_hqd_destroy() just returns -ETIME leaving queue acquired.
It may cause a deadlock, so the patch proposes to release queue before return.

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Alexey Khoroshilov <khoroshilov@...ras.ru>
---
 drivers/gpu/drm/radeon/radeon_kfd.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/radeon/radeon_kfd.c b/drivers/gpu/drm/radeon/radeon_kfd.c
index 242fd8b1b221..335e29dbab05 100644
--- a/drivers/gpu/drm/radeon/radeon_kfd.c
+++ b/drivers/gpu/drm/radeon/radeon_kfd.c
@@ -556,6 +556,7 @@ static int kgd_hqd_destroy(struct kgd_dev *kgd, uint32_t reset_type,
 		if (timeout == 0) {
 			pr_err("kfd: cp queue preemption time out (%dms)\n",
 				temp);
+			release_queue(kgd);
 			return -ETIME;
 		}
 		msleep(20);
-- 
1.9.1

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