From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from sender4-pp-f112.zoho.com (sender4-pp-f112.zoho.com [136.143.188.112]) (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 8ADEB3955CC; Sat, 27 Jun 2026 10:58:16 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=pass smtp.client-ip=136.143.188.112 ARC-Seal:i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1782557897; cv=pass; b=tCUwFaldrRomjQ8nWeb+ZDphbxzu5LBgt3rZoKN76GdcTE5djxbOJermplGW1/jcFGZaif4QdheVGHSBOWSa+Nxan7WfdrINgtW4oi+AY0wdlE0HslPLEwV0a8Z+Yq7BMY2w4IvLTJ3ajDBJvoABpqxQlAFWcPASaZcuY5tACkA= ARC-Message-Signature:i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1782557897; c=relaxed/simple; bh=PnaZSeJ/fJmMzFSY6kGEVXE/lKFbg9YM0ZSITZYEbbA=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=AdFgXFs2HVOPBTiEDCHwIPiRU7SpKa2M95OXZphex+BUhE5eKgcY1KmqtBl/+rlDQwk1NeDiK7yAw9MuvGdsAsMHHquX0mM/rmh5ndMdLz6qodDvXkYfNy+ja930kF8jkpdnqYPHIj4b+6oextPJ18FvPy5oQOULiWxbbRdTSlw= ARC-Authentication-Results:i=2; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=collabora.com; spf=pass smtp.mailfrom=collabora.com; dkim=pass (1024-bit key) header.d=collabora.com header.i=robert.mader@collabora.com header.b=cU8OprZX; arc=pass smtp.client-ip=136.143.188.112 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=collabora.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=collabora.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=collabora.com header.i=robert.mader@collabora.com header.b="cU8OprZX" ARC-Seal: i=1; a=rsa-sha256; t=1782557891; cv=none; d=zohomail.com; s=zohoarc; b=TPAszodKOjsHUQXUH/Gxt1QipDH1lvWmdbKozRWi5dy/teU0upLxEInQumEdQfhSBqJLAwvsaobWNQH0URNI3lAtBCHYGiWMp1pblJvk+fyJDFY7q5jiu7GBz2QCEtc+dT574te1z/bfRcgKNOzc1VElb2Clp0fEHVn3j3uDE8w= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1782557891; h=Content-Transfer-Encoding:Cc:Cc:Date:Date:From:From:MIME-Version:Message-ID:Subject:Subject:To:To:Message-Id:Reply-To; bh=r+ECMRwUoj1qfDDF4fDzCAVRuUEA0RstFvYJct8WxzA=; b=PK1/UPu/M6RTUAKbVCj83VqjDbOGQjkuuLElGFakYK+i/706TJsoQ+rEiYsmzEZI4gT8PhO6TURfczO1MEY/52+GEx2mQW2yQ0fNogx20T1z+/Eg4i/U+Ep8rWpHrXbcxIhhrWn/Q0DTyGzud2s0JuCTq+56SAk7qfGnUu1MCUo= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass header.i=collabora.com; spf=pass smtp.mailfrom=robert.mader@collabora.com; dmarc=pass header.from= DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; t=1782557891; s=zohomail; d=collabora.com; i=robert.mader@collabora.com; h=From:From:To:To:Cc:Cc:Subject:Subject:Date:Date:Message-ID:MIME-Version:Content-Transfer-Encoding:Message-Id:Reply-To; bh=r+ECMRwUoj1qfDDF4fDzCAVRuUEA0RstFvYJct8WxzA=; b=cU8OprZXYkA4b725w/61H0jdD87dKL0542c6VnfpjBYdZZCU7nWp0zqYGjTyMX+5 3UxVYdaADSPAmtwTUN+AMUMQuYJujapf+SPjmBoQtv/jbBWFIa7U1t+QhD9jmE8qXfR glrUulBRE0jqahNIBQEKiZYYjjQ8ZjggRSFM6dE0= Received: by mx.zohomail.com with SMTPS id 1782557889082692.4068701852244; Sat, 27 Jun 2026 03:58:09 -0700 (PDT) From: Robert Mader To: mikhail.v.gavrilov@gmail.com, vivek.kasireddy@intel.com Cc: dri-devel@lists.freedesktop.org, linux-media@vger.kernel.org, linux-kernel@vger.kernel.org, Robert Mader Subject: [PATCH v1] udmabuf: Ensure to perform cache synchronisation in begin_cpu_udmabuf() Date: Sat, 27 Jun 2026 12:57:25 +0200 Message-ID: <20260627105725.9083-1-robert.mader@collabora.com> X-Mailer: git-send-email 2.54.0 Precedence: bulk X-Mailing-List: linux-media@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit The message of commit 504e2b4ab97a ("dma-buf/udmabuf: skip redundant cpu sync to fix cacheline EEXIST warning") says: > The CPU sync at map/unmap time is also redundant for udmabuf: > begin_cpu_udmabuf() and end_cpu_udmabuf() already perform explicit > cache synchronization via dma_sync_sgtable_for_cpu/device() when CPU > access is requested through the dma-buf interface. This, however, does not apply to the first time begin_cpu_udmabuf() is called on an udmabuf, in which case the implementation previously relied on get_sg_table() to perform the cache synchronisation. Ensure to call dma_sync_sgtable_for_cpu() in that case as well. Fixes: 504e2b4ab97a ("dma-buf/udmabuf: skip redundant cpu sync to fix cacheline EEXIST warning") Signed-off-by: Robert Mader --- drivers/dma-buf/udmabuf.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) diff --git a/drivers/dma-buf/udmabuf.c b/drivers/dma-buf/udmabuf.c index bced421c0d65..08f57bc1294d 100644 --- a/drivers/dma-buf/udmabuf.c +++ b/drivers/dma-buf/udmabuf.c @@ -224,21 +224,22 @@ static int begin_cpu_udmabuf(struct dma_buf *buf, { struct udmabuf *ubuf = buf->priv; struct device *dev = ubuf->device->this_device; - int ret = 0; if (!ubuf->sg) { ubuf->sg = get_sg_table(dev, buf, direction); if (IS_ERR(ubuf->sg)) { + int ret; + ret = PTR_ERR(ubuf->sg); ubuf->sg = NULL; + return ret; } else { ubuf->sg_dir = direction; } - } else { - dma_sync_sgtable_for_cpu(dev, ubuf->sg, direction); } - return ret; + dma_sync_sgtable_for_cpu(dev, ubuf->sg, direction); + return 0; } static int end_cpu_udmabuf(struct dma_buf *buf, -- 2.54.0