From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from m16.mail.163.com (m16.mail.163.com [220.197.31.3]) (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 9F0E5495020 for ; Mon, 19 Oct 2026 08:42:52 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=220.197.31.3 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1792399375; cv=none; b=tZRNY3q0068uWYIGhOQ1mxsoWUCKR87orTLDjpiA1iVtvXRhYh+Cnl2460LNp56fsrobNevr3PNMaNRStAfXVouzHzOHIfmJCZwZrzPGaGOCSNGTjLqwv4VMkcbhkWQ3wJ0mz4XgnYoSNp8FtP3LD7uivvnvjyPR6Dq2lYyQlaE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1792399375; c=relaxed/simple; bh=4brpr3mbOPouT+2U8bTcLTCVXxPGQmoWRZaqziux3eI=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=l+90NS7zDokBc1B/K0BghL3m9cb/ZG9kCFyTP7CImIjWpeCoTd0ejxhZ8N75FyS1newyWLfdXKFul9/BtNAYYxe3XGXwdiEfwcdtb86taJSWoO8ksONhaISxUFPRbvYJPCA7NeI70mJUfzgDmaECj8eyu2Z0HBR2QsHK+tspBl4= 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=SW421hVv; arc=none smtp.client-ip=220.197.31.3 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="SW421hVv" 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=8w BHesupO68D0giBCVsmqzzCieBBTYajRHnqr5mfSWI=; b=SW421hVv2v1/HXeM8K pYZiR8nJjCDnrldoSnL6W6r5boVP4tSvlbUn1XZGvq51IM+Acs8STjtLiQ1zp1Pt XRrVameRislG3EO7qge3vHho/yf8uF8Yh6qy/Wdun/eUjqKlkm+qW1HJtyB5ikMb YglvodBAOC2IrMaA8p4+wAYqg= Received: from pc.localdomain (unknown []) by gzga-smtp-mtada-g1-4 (Coremail) with SMTP id _____wDnt9ng19VqcQOlAw--.9091S6; Mon, 19 Oct 2026 16:42:17 +0800 (CST) From: Jiale Yao To: Alex Deucher , =?UTF-8?q?Christian=20K=C3=B6nig?= , David Airlie , Simona Vetter , Dave Airlie , Ben Skeggs , amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org Cc: Jiale Yao Subject: [PATCH 4/6] drm/radeon: reject empty VRAM ranges Date: Mon, 19 Oct 2026 16:41:36 +0800 Message-Id: <20261019084138.1821477-5-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--.9091S6 X-Coremail-Antispam: 1Uf129KBjvdXoWrKrykuF1kZry7CF4rJrW8Zwb_yoWDXrgEgr 40va4xX34qg3WvqF1kua13ZrZIya1v9Fs5ZF1Iq34fKr9rXF1xZFy3Xr1kXrWUWw43AF98 ArsYq3y3trZI9jkaLaAFLSUrUUUUjb8apTn2vfkv8UJUUUU8Yxn0WfASr-VFAUDa7-sFnT 9fnUUvcSsGvfC2KfnxnUUI43ZEXa7sRiveHPUUUUU== X-CM-SenderInfo: x1dryxhdohiji6rwjhhfrp/xtbC8AlAemrV1+m3QgAA33 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 initializing the VRAM manager. Fixes: 37205891d84f ("drm/ttm: make ttm_range_man_init/takedown take type + args") Signed-off-by: Jiale Yao --- drivers/gpu/drm/radeon/radeon_ttm.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/gpu/drm/radeon/radeon_ttm.c b/drivers/gpu/drm/radeon/radeon_ttm.c index e7ab8162ac69..925593af1688 100644 --- a/drivers/gpu/drm/radeon/radeon_ttm.c +++ b/drivers/gpu/drm/radeon/radeon_ttm.c @@ -69,6 +69,9 @@ struct radeon_device *radeon_get_rdev(struct ttm_device *bdev) static int radeon_ttm_init_vram(struct radeon_device *rdev) { + if (rdev->mc.real_vram_size < PAGE_SIZE) + return -EINVAL; + return ttm_range_man_init(&rdev->mman.bdev, TTM_PL_VRAM, false, rdev->mc.real_vram_size >> PAGE_SHIFT); } -- 2.34.1