From mboxrd@z Thu Jan 1 00:00:00 1970 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,URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable 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 571EBC433E6 for ; Thu, 7 Jan 2021 21:17:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2FBBB235DD for ; Thu, 7 Jan 2021 21:17:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727582AbhAGVQy (ORCPT ); Thu, 7 Jan 2021 16:16:54 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35472 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727011AbhAGVQw (ORCPT ); Thu, 7 Jan 2021 16:16:52 -0500 Received: from mail-pf1-x432.google.com (mail-pf1-x432.google.com [IPv6:2607:f8b0:4864:20::432]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id DFC80C0612FA for ; Thu, 7 Jan 2021 13:15:31 -0800 (PST) Received: by mail-pf1-x432.google.com with SMTP id c12so4730500pfo.10 for ; Thu, 07 Jan 2021 13:15:31 -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=cHSZgqczj464Vf520gWeFxP2skBA26Gc4qDuq1k8SZeOGcfiiKTsmZsKBzVJdyquDP AwP7iEXEk3FUyf7L5lc4NpelRvFLZEqi6kU8c4hrfifAl04y8vtm7TNoDnKC63HO5SWh lvZZyVDoTP+zd7oHSx0sgJu/5FP0Do/q4vTVgiaLwFYflQVgzzvQt/kR9/i31MISy4tq LbZLvEw+G5rucP4QbGOC20BkR+d3pP9e1EqPfafczaD7SUTW8Q7US+QdpxgtZQPx7nXU sKm0TId7I+tNjCMRk2+nJ9OV9f/iHF9+aoyoW0ijSIp6Kfox+9TUooajqLsw5KAD6xDw p5Nw== 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=fQd/KWGMgoj6mqaweQwZ++SYI4Dknn8ZoZL6jNNozaI8B8iz5XOMUYCpMHnrhhIafV JQBTxAH269Jf1Ke1W6uIwPUT61Ql03s1L5yOVs3wmJtHklsedyuIcNaQngcrZG2Tf9Fc 2R29keGeLRMnfoUDfQH7z7bd+ubqO4WgwZw7iaYNneoRDCRG29HOmRgocmmWONu40YnA tT3jD9F9Dl5Q7pAIwl5vYm6CkOiu1rv1e5J1buuv1DDTR70tbquXd+tveSIzoWvmtH7N +Py/5dvtiWAo1KrljEYSDTcv2b34ZFTOAsUkqS0VhTB//dc907PUTf8DGdqpZfubTJLk diWw== X-Gm-Message-State: AOAM532HrlG81K79Vyd5OV6hNkXAFST6KtsINltqTalBrxT3j1Z4Dpjp 7K+umdtDHfLunGG4IWh9hMBtD9Xt15S1yQ== X-Google-Smtp-Source: ABdhPJy9pko8exsJmRsYgHZWzS6HB4ShY5PboCyRW7n6CbWSr9ryNiq7i9X3M83nJXNVn5LYJ0D45Q== X-Received: by 2002:aa7:97bc:0:b029:19e:18c7:76b with SMTP id d28-20020aa797bc0000b029019e18c7076bmr501704pfq.23.1610054131037; Thu, 07 Jan 2021 13:15:31 -0800 (PST) Received: from localhost.localdomain ([2601:1c2:680:1319:692:26ff:feda:3a81]) by smtp.gmail.com with ESMTPSA id b6sm6574055pfd.43.2021.01.07.13.15.29 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 07 Jan 2021 13:15:30 -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=20Eide?= , Robin Murphy , Ezequiel Garcia , Simon Ser , James Jones , linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org Subject: [PATCH 2/3] dma-buf: heaps: Add a WARN_ON should the vmap_cnt go negative Date: Thu, 7 Jan 2021 21:15:24 +0000 Message-Id: <20210107211525.75951-2-john.stultz@linaro.org> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20210107211525.75951-1-john.stultz@linaro.org> References: <20210107211525.75951-1-john.stultz@linaro.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@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; -- 2.17.1