From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from m16.mail.163.com (m16.mail.163.com [117.135.210.5]) (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 504404908AE for ; Mon, 19 Oct 2026 08:43:20 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=117.135.210.5 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1792399403; cv=none; b=NbFrqA3A3kDvqI1I3izF2ACwCrwIJAzrS9+KOW0o5dU6dwaIOYIAJHegjYizgFbjsyrieXTWeQpGzXqipx/Fb90mwqWn9SoZ3b+4VfN1B3PKfrJH7/Eytv7Cz1GOK7TatI17prls8Y83tfcQOujTXdBqMxrlvqEjl8WeqBgOWBs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1792399403; c=relaxed/simple; bh=gzWLeCzefFkwWIhxR3fEpyM/vKrfUpCJyJKJMfvlbVM=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=Mh3dB7gpIS7bOqkDeqgRwEyHM9+BPOqKbHsRKIxumjIJSRIBeGbtshr4dQ/GAvvXtekTW8pNmfbIay0Ig94ipUxZVSOOWKFOyRPhxGTRylDQpocOmZlMXrJi+MIhM94J6wBe18FH6ryLCvGa9ATvtDZfsDKJAfqI9A2G1onU90g= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=163.com; spf=pass smtp.mailfrom=163.com; dkim=pass (1024-bit key) header.d=163.com header.i=@163.com header.b=mHcNn0J8; arc=none smtp.client-ip=117.135.210.5 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=163.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=163.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=163.com header.i=@163.com header.b="mHcNn0J8" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=163.com; s=s110527; h=From:To:Subject:Date:Message-Id:MIME-Version; bh=Nu 0yQN7bhLhr8bDqdr0q6HH12zA2QVcA+U6iZqh2KIw=; b=mHcNn0J8DjY6J6LhIo J/CAkIMpmbvADsjUthx34hFLFsqQIS542R07Puek3+nFCpuOJDRWROA4Xpr4W8Ez 0tldTLOTTFuCC7giXI+aFGdhVPlurkGLSWbPqYZkGZt1taEYkvhc15jrj6/zBSm0 ybbfQ9pbV53YR0Xepr/QotIEc= Received: from pc.localdomain (unknown []) by gzga-smtp-mtada-g1-4 (Coremail) with SMTP id _____wDnt9ng19VqcQOlAw--.9091S8; Mon, 19 Oct 2026 16:42:19 +0800 (CST) From: Jiale Yao To: Zack Rusin , Broadcom internal kernel review list , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Ben Skeggs , =?UTF-8?q?Christian=20K=C3=B6nig?= , Dave Airlie , dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org Cc: Jiale Yao Subject: [PATCH 6/6] drm/vmwgfx: reject empty VRAM ranges Date: Mon, 19 Oct 2026 16:41:38 +0800 Message-Id: <20261019084138.1821477-7-yaojiale02@163.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20261019084138.1821477-1-yaojiale02@163.com> References: <20261019084138.1821477-1-yaojiale02@163.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CM-TRANSID:_____wDnt9ng19VqcQOlAw--.9091S8 X-Coremail-Antispam: 1Uf129KBjvdXoWrKrW8Xr1kuw4DArWxKw1xKrg_yoWDKFg_ua y0yrn7XF4UuFn8u3ZFk34fZFyaya1kuFs5Zw4fta45t3ZrtryxWryjgr97X348Gw13Ca4k ur45Gw4ftFsrujkaLaAFLSUrUUUUjb8apTn2vfkv8UJUUUU8Yxn0WfASr-VFAUDa7-sFnT 9fnUUvcSsGvfC2KfnxnUUI43ZEXa7sRi9YFtUUUUU== X-CM-SenderInfo: x1dryxhdohiji6rwjhhfrp/xtbC7wtAemrV1+s3GQAA3z A VRAM size smaller than a page becomes a zero-page TTM range and causes drm_mm_init() to hit its zero-range BUG check. Reject such a range before creating the VRAM manager. Fixes: 37205891d84f ("drm/ttm: make ttm_range_man_init/takedown take type + args") Signed-off-by: Jiale Yao --- drivers/gpu/drm/vmwgfx/vmwgfx_drv.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c index 0f101aedb49a..33284a776fa6 100644 --- a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c @@ -692,6 +692,10 @@ static int vmw_dma_masks(struct vmw_private *dev_priv) static int vmw_vram_manager_init(struct vmw_private *dev_priv) { int ret; + + if (dev_priv->vram_size < PAGE_SIZE) + return -EINVAL; + ret = ttm_range_man_init(&dev_priv->bdev, TTM_PL_VRAM, false, dev_priv->vram_size >> PAGE_SHIFT); ttm_resource_manager_set_used(ttm_manager_type(&dev_priv->bdev, TTM_PL_VRAM), false); -- 2.34.1