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: 12030765 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=-16.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,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 D365CC433E6 for ; Tue, 19 Jan 2021 20:45:20 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 6E91D23107 for ; Tue, 19 Jan 2021 20:45:20 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 6E91D23107 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linaro.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=dri-devel-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 7120689C54; Tue, 19 Jan 2021 20:45:19 +0000 (UTC) Received: from mail-pg1-x529.google.com (mail-pg1-x529.google.com [IPv6:2607:f8b0:4864:20::529]) by gabe.freedesktop.org (Postfix) with ESMTPS id 3B29C89B20 for ; Tue, 19 Jan 2021 20:45:14 +0000 (UTC) Received: by mail-pg1-x529.google.com with SMTP id z21so13721995pgj.4 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=tK7hFkt0i2wFbBiYkY8YRJNXaMZTw7e5ltRtCCbQbyWGo7VcTsFYFFXb6TiqqhW8Ho m1/eE79xkSY4lNwwNjxnJ1HY3WuOUyf0ULc4Wjv5y6QNL5r2Dr+Sxb6cC1CfJnlCAZq9 ibrmAPESY3LF7Wpsj7Jn4e+/0fXj2uhJ4fg9f0wDNmLR24KS6Xk9czu3gAebPiAhctD5 HKC8uu73mrABMY8oekjpyAiLLQeE3sIXsNlysY1YQh04dxD2qfjvYiWJOg9VCxrjZt/W ruU4uhNT9BaIvv+TNrnzSmCwiQonAVtaIUIYUrmZUxk/AAfgP5eXKxkmgZN3I1EZSkjC PxPQ== X-Gm-Message-State: AOAM532lKucPTilfE5ZqwKofysWqBKqBchN6R7Q3pW55mg1P1Xc8uZhK Ie2zSNpRvhIRcYsYAQvM0XwNww== 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 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 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Sandeep Patil , dri-devel@lists.freedesktop.org, Ezequiel Garcia , Robin Murphy , James Jones , Liam Mark , Laura Abbott , Chris Goldsworthy , Hridya Valsaraju , =?utf-8?q?=C3=98rjan_Eide?= , linux-media@vger.kernel.org, Suren Baghdasaryan , Daniel Mentz Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" 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;