From patchwork Tue Jan 19 20:45:07 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: John Stultz X-Patchwork-Id: 12030769 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-18.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id B23FDC433E9 for ; Tue, 19 Jan 2021 20:46:30 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 541BD23119 for ; Tue, 19 Jan 2021 20:46:30 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388647AbhASUqU (ORCPT ); Tue, 19 Jan 2021 15:46:20 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49376 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2387591AbhASUpy (ORCPT ); Tue, 19 Jan 2021 15:45:54 -0500 Received: from mail-pg1-x530.google.com (mail-pg1-x530.google.com [IPv6:2607:f8b0:4864:20::530]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3861EC0613ED for ; Tue, 19 Jan 2021 12:45:14 -0800 (PST) Received: by mail-pg1-x530.google.com with SMTP id 30so13712902pgr.6 for ; Tue, 19 Jan 2021 12:45:14 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=+HPHLTIbnqvyYqZakEN0yW6023R2vX5SvJvHEGRsu88=; b=rVY83dpi8ReoTmjM5P+oExiEZYsinMGkbYee1lkK/ULznES2ZNsQayfBScXWTZxwHT xzR9TWfOeB0CMtADGKZkF8TcwHODZPc1u4AMryo79Zq9NNv2fP2u7rpmstz007F5Nwzb fYc/mdbBQq3n41ctal8AiQZluORE84aHZh48bd34Zb95cR6VzRRKiIQtqtWHSWK5Ql/Z 37MtMXfQhlWisjAseq7aB5u02jTDZwCwRQhmEw5cye33lLvuVq6TSjWkKCFJCnRio0sf Jg4mseBZ0ILUNtu46AlrTKRbSYK79YX03tEGKvAoDHj4I2D3x6wz8PcifiCFUrwR00mS hKXA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=+HPHLTIbnqvyYqZakEN0yW6023R2vX5SvJvHEGRsu88=; b=ow1iwcKAqwPMPw41b16kv9wOaTep/MLHHmejUzZNk1TxmGeK9kPKPN0bWZpQGpvDY/ 8iE4wVwAv/+BOfVwa5VJxvve69XTvNmhDnmqpjnaeGHHR7xe5EutZZwBxfF0PTKaP6n6 c8m/bsxJNTzNwExNcFizo1o/cORpWaOOgLs3HhLq6kHJQ4X5VnyyDXS7GJxxrIgxLjO4 i+5RXMa16+LY9rrhwvgXBoYDuMxioYE85+A16s8mI/Q0dcfJ3VUWjmYUr65bMWFW/DC4 Yseol8p/KGwQjVNOvdP7JdvZZY6nNlwpynnoTM42j46f5q/ktGvLyL/oWIXmnDLKn+2a Cbug== X-Gm-Message-State: AOAM532xd5rKbr32jzlO/qZSXlmxT31Y+1SZqajprm+aMW9HpS18bK4k DuXTzdAA3R/691dhgXKyQ0MguA== X-Google-Smtp-Source: ABdhPJx7XqKFUvEfxsZUM/yPecJslI2EJghoNxHC6weKaxS/Wdl7E5UFXQpws/ka9g4TjNc2jaAWIA== X-Received: by 2002:a62:5b07:0:b029:1ae:177d:69e1 with SMTP id p7-20020a625b070000b02901ae177d69e1mr5644437pfb.25.1611089113811; Tue, 19 Jan 2021 12:45:13 -0800 (PST) Received: from localhost.localdomain ([2601:1c2:680:1319:692:26ff:feda:3a81]) by smtp.gmail.com with ESMTPSA id md7sm4129838pjb.52.2021.01.19.12.45.12 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 19 Jan 2021 12:45:12 -0800 (PST) From: John Stultz To: lkml Cc: John Stultz , Sumit Semwal , Liam Mark , Laura Abbott , Brian Starkey , Hridya Valsaraju , Suren Baghdasaryan , Sandeep Patil , Daniel Mentz , Chris Goldsworthy , =?utf-8?q?=C3=98rjan_Eide?= , Robin Murphy , Ezequiel Garcia , Simon Ser , James Jones , linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org Subject: [RESEND][PATCH 2/3] dma-buf: heaps: Add a WARN_ON should the vmap_cnt go negative Date: Tue, 19 Jan 2021 20:45:07 +0000 Message-Id: <20210119204508.9256-2-john.stultz@linaro.org> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20210119204508.9256-1-john.stultz@linaro.org> References: <20210119204508.9256-1-john.stultz@linaro.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org We shouldn't vunmap more then we vmap, but if we do, make sure we complain loudly. Cc: Sumit Semwal Cc: Liam Mark Cc: Laura Abbott Cc: Brian Starkey Cc: Hridya Valsaraju Cc: Suren Baghdasaryan Cc: Sandeep Patil Cc: Daniel Mentz Cc: Chris Goldsworthy Cc: Ørjan Eide Cc: Robin Murphy Cc: Ezequiel Garcia Cc: Simon Ser Cc: James Jones Cc: linux-media@vger.kernel.org Cc: dri-devel@lists.freedesktop.org Suggested-by: Suren Baghdasaryan Signed-off-by: John Stultz --- drivers/dma-buf/heaps/cma_heap.c | 1 + drivers/dma-buf/heaps/system_heap.c | 1 + 2 files changed, 2 insertions(+) diff --git a/drivers/dma-buf/heaps/cma_heap.c b/drivers/dma-buf/heaps/cma_heap.c index 364fc2f3e499..0c76cbc3fb11 100644 --- a/drivers/dma-buf/heaps/cma_heap.c +++ b/drivers/dma-buf/heaps/cma_heap.c @@ -232,6 +232,7 @@ static void cma_heap_vunmap(struct dma_buf *dmabuf, struct dma_buf_map *map) struct cma_heap_buffer *buffer = dmabuf->priv; mutex_lock(&buffer->lock); + WARN_ON(buffer->vmap_cnt == 0); if (!--buffer->vmap_cnt) { vunmap(buffer->vaddr); buffer->vaddr = NULL; diff --git a/drivers/dma-buf/heaps/system_heap.c b/drivers/dma-buf/heaps/system_heap.c index 405351aad2a8..2321c91891f6 100644 --- a/drivers/dma-buf/heaps/system_heap.c +++ b/drivers/dma-buf/heaps/system_heap.c @@ -273,6 +273,7 @@ static void system_heap_vunmap(struct dma_buf *dmabuf, struct dma_buf_map *map) struct system_heap_buffer *buffer = dmabuf->priv; mutex_lock(&buffer->lock); + WARN_ON(buffer->vmap_cnt == 0); if (!--buffer->vmap_cnt) { vunmap(buffer->vaddr); buffer->vaddr = NULL;