From nobody Sat Feb 7 07:10:24 2026 Received: from n169-113.mail.139.com (n169-113.mail.139.com [120.232.169.113]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 136CE2C21C3; Mon, 2 Feb 2026 07:58:35 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=120.232.169.113 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770019121; cv=none; b=BqZQTy4uKhQpPJKnRSgAfE7qYsvh8R6cmWGqM8NIkYK0VT5/9fwBOJo68dqxAR5E+yoNIm206rPNiO6C7BdMKIYDaLMm8viBjcXDwnk2Wj6MHN8g02AQzKoMqTQqZloqlFPNITNdszCsnKD1g+AneXFMji2Ih4cPKdxTLxFZG4g= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770019121; c=relaxed/simple; bh=GFchh94KY6iI241akTdSE8cFka8LNsvDc6Ly558ZchM=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=eFW6emOi9phwPsVQRXMQYEcRxFji9IoEOv7LjuCQ1sU2uwanckKRLuoCC6cgm2sQrFRC41ASY+f83oTgPJPmKp7xtviqspppetTowFnjlJVjExL9uZBHKex+9xNQgYqX6EsaaSYzdORUj6PYs+EeSeGwbee9cF+8/uipAaX/Gbk= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=139.com; spf=pass smtp.mailfrom=139.com; dkim=pass (1024-bit key) header.d=139.com header.i=@139.com header.b=1FTqiR+0; arc=none smtp.client-ip=120.232.169.113 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=139.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=139.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=139.com header.i=@139.com header.b="1FTqiR+0" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=139.com; s=dkim; l=0; h=from:subject:message-id:to:cc:mime-version; bh=47DEQpj8HBSa+/TImW+5JCeuQeRkm5NMpJWZG3hSuFU=; b=1FTqiR+0RedpPLCPg3Lc5cDKnHZURz5HHU7sHe6nfm1d+Zav7sx9EFVtRyZ7SL4WXMw5JCry3hhga 5d2AygOCXnfsd84lflJbfOE0HwWK7m8+XeG5VhIHeVox3Abo06cr5Z+OyG1AOdaXGqIxFULw7N3Skj WZ/FppFfV/SKLSZ8= X-RM-TagInfo: emlType=0 X-RM-SPAM: X-RM-SPAM-FLAG: 00000000 Received: from NTT-kernel-dev (unknown[60.247.85.88]) by rmsmtp-lg-appmail-32-12046 (RichMail) with SMTP id 2f0e6980591ab5b-00b69; Mon, 02 Feb 2026 15:58:21 +0800 (CST) X-RM-TRANSID: 2f0e6980591ab5b-00b69 From: Li hongliang <1468888505@139.com> To: gregkh@linuxfoundation.org, stable@vger.kernel.org, rbmccav@gmail.com Cc: patches@lists.linux.dev, linux-kernel@vger.kernel.org, alexander.deucher@amd.com, christian.koenig@amd.com, Xinhui.Pan@amd.com, airlied@gmail.com, daniel@ffwll.ch, amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org Subject: [PATCH 6.6.y] drm/radeon: delete radeon_fence_process in is_signaled, no deadlock Date: Mon, 2 Feb 2026 15:58:31 +0800 Message-Id: <20260202075831.947537-1-1468888505@139.com> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Robert McClinton [ Upstream commit 9eb00b5f5697bd56baa3222c7a1426fa15bacfb5 ] Delete the attempt to progress the queue when checking if fence is signaled. This avoids deadlock. dma-fence_ops::signaled can be called with the fence lock in unknown state. For radeon, the fence lock is also the wait queue lock. This can cause a self deadlock when signaled() tries to make forward progress on the wait queue. But advancing the queue is unneeded because incorrectly returning false from signaled() is perfectly acceptable. Link: https://github.com/brave/brave-browser/issues/49182 Closes: https://gitlab.freedesktop.org/drm/amd/-/issues/4641 Cc: Alex Deucher Signed-off-by: Robert McClinton Signed-off-by: Alex Deucher (cherry picked from commit 527ba26e50ec2ca2be9c7c82f3ad42998a75d0db) Cc: stable@vger.kernel.org [ Minor conflict resolved. ] Signed-off-by: Li hongliang <1468888505@139.com> --- drivers/gpu/drm/radeon/radeon_fence.c | 8 -------- 1 file changed, 8 deletions(-) diff --git a/drivers/gpu/drm/radeon/radeon_fence.c b/drivers/gpu/drm/radeon= /radeon_fence.c index 6d5e828fa39e..1462837fda5a 100644 --- a/drivers/gpu/drm/radeon/radeon_fence.c +++ b/drivers/gpu/drm/radeon/radeon_fence.c @@ -362,14 +362,6 @@ static bool radeon_fence_is_signaled(struct dma_fence = *f) return true; } =20 - if (down_read_trylock(&rdev->exclusive_lock)) { - radeon_fence_process(rdev, ring); - up_read(&rdev->exclusive_lock); - - if (atomic64_read(&rdev->fence_drv[ring].last_seq) >=3D seq) { - return true; - } - } return false; } =20 --=20 2.34.1