Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0B3ADC433F5 for ; Fri, 26 Nov 2021 06:33:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1358745AbhKZGgS (ORCPT ); Fri, 26 Nov 2021 01:36:18 -0500 Received: from new2-smtp.messagingengine.com ([66.111.4.224]:41993 "EHLO new2-smtp.messagingengine.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1352604AbhKZGeR (ORCPT ); Fri, 26 Nov 2021 01:34:17 -0500 Received: from compute5.internal (compute5.nyi.internal [10.202.2.45]) by mailnew.nyi.internal (Postfix) with ESMTP id 4911758030B; Fri, 26 Nov 2021 01:31:04 -0500 (EST) Received: from mailfrontend2 ([10.202.2.163]) by compute5.internal (MEProxy); Fri, 26 Nov 2021 01:31:04 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kroah.com; h= date:from:to:cc:subject:message-id:references:mime-version :content-type:in-reply-to; s=fm2; bh=TQT7bhXqwH8akKiIgle7DOfwOzq sXFgyjCJ+JSwVBvM=; b=UArY7GF/grHcjnLfBnXEUU1gwzqTyNaaOluwb+sg0Eo pm+/1TsfpLJAebvBYApjuv3QnnnlEa3HKiaUw0P9fxcA8XHtXWdnrWB6sAwvLghr LOvI9XUzjoetQ7FveDlUQAeKg8j8FYqbdK43JJXM+GiYg58cOSAI21yr+b4cxxoM OszMI1XHTjBFRX7/Gu1lFy/6jg5XBUrEim4Fz5YGMOoe554GfMxmBrs72PDEP0xg Twv/mANVLQoUrK8AtS7bFKIgj4+WdMrCyOSAqYbHBgb68AiUBTRs5wlU4U5MOAja IawCmEDPlpOyGCwnyvoSkIwlNuxwVJTHw3clze+/mZA== DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=cc:content-type:date:from:in-reply-to :message-id:mime-version:references:subject:to:x-me-proxy :x-me-proxy:x-me-sender:x-me-sender:x-sasl-enc; s=fm1; bh=TQT7bh XqwH8akKiIgle7DOfwOzqsXFgyjCJ+JSwVBvM=; b=ad7MUCGgy6GBCEqiy5C7uF ENvuoMF/KjO9QrM9e+6Lfkql40q5ow+9hhnHEjNDZ0/v0R7eBG+dbTVPRg45BseY l6gY4gC/yALZBstQklXQfqD4FBY+g2bFVHBCDHfB/MaI8gEciv4JrkQ6yhxBrKz1 CGbqK6u2RIS7vXeNUVfmhjyT7Tn+vfL90md6jHPu9Ueu8HrkWljf1niHkQCDocoW CaUyH3Psf9Q7ARs3nafg+tDn4VnCCTVOknEiaYbfxiG7Fdv6imBrkTFyijuFmkaH 1BDnujDlMfsYcznk3Zmu2vrST6xQ8S63AWa4KUxxZ5tTsz/Pu9c7qQdxIaygrzXw == X-ME-Sender: X-ME-Received: X-ME-Proxy-Cause: gggruggvucftvghtrhhoucdtuddrgedvuddrhedugdeliecutefuodetggdotefrodftvf curfhrohhfihhlvgemucfhrghsthforghilhdpqfgfvfdpuffrtefokffrpgfnqfghnecu uegrihhlohhuthemuceftddtnecunecujfgurhepfffhvffukfhfgggtuggjsehttdertd dttddvnecuhfhrohhmpefirhgvghcumffjuceoghhrvghgsehkrhhorghhrdgtohhmqeen ucggtffrrghtthgvrhhnpeeuleeltdehkeeltefhleduuddvhfffuedvffduveegheekge eiffevheegfeetgfenucffohhmrghinhepkhgvrhhnvghlrdhorhhgnecuvehluhhsthgv rhfuihiivgeptdenucfrrghrrghmpehmrghilhhfrhhomhepghhrvghgsehkrhhorghhrd gtohhm X-ME-Proxy: Received: by mail.messagingengine.com (Postfix) with ESMTPA; Fri, 26 Nov 2021 01:31:02 -0500 (EST) Date: Fri, 26 Nov 2021 07:31:00 +0100 From: Greg KH To: guangming.cao@mediatek.com Cc: robin.murphy@arm.com, Brian.Starkey@arm.com, benjamin.gaignard@linaro.org, christian.koenig@amd.com, dri-devel@lists.freedesktop.org, john.stultz@linaro.org, labbott@redhat.com, linaro-mm-sig@lists.linaro.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, linux-mediatek@lists.infradead.org, lmark@codeaurora.org, matthias.bgg@gmail.com, sumit.semwal@linaro.org, wsd_upstream@mediatek.com, stable@vger.kernel.org Subject: Re: [PATCH v3] dma-buf: system_heap: Use 'for_each_sgtable_sg' in pages free flow Message-ID: References: <20211126031605.81436-1-guangming.cao@mediatek.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20211126031605.81436-1-guangming.cao@mediatek.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Nov 26, 2021 at 11:16:05AM +0800, guangming.cao@mediatek.com wrote: > From: Guangming > > For previous version, it uses 'sg_table.nent's to traverse sg_table in pages > free flow. > However, 'sg_table.nents' is reassigned in 'dma_map_sg', it means the number of > created entries in the DMA adderess space. > So, use 'sg_table.nents' in pages free flow will case some pages can't be freed. > > Here we should use sg_table.orig_nents to free pages memory, but use the > sgtable helper 'for each_sgtable_sg'(, instead of the previous rather common > helper 'for_each_sg' which maybe cause memory leak) is much better. > > Fixes: d963ab0f15fb0 ("dma-buf: system_heap: Allocate higher order pages if available") > > Signed-off-by: Guangming > --- > drivers/dma-buf/heaps/system_heap.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/dma-buf/heaps/system_heap.c b/drivers/dma-buf/heaps/system_heap.c > index 23a7e74ef966..8660508f3684 100644 > --- a/drivers/dma-buf/heaps/system_heap.c > +++ b/drivers/dma-buf/heaps/system_heap.c > @@ -289,7 +289,7 @@ static void system_heap_dma_buf_release(struct dma_buf *dmabuf) > int i; > > table = &buffer->sg_table; > - for_each_sg(table->sgl, sg, table->nents, i) { > + for_each_sgtable_sg(table, sg, i) { > struct page *page = sg_page(sg); > > __free_pages(page, compound_order(page)); > -- > 2.17.1 > This is not the correct way to submit patches for inclusion in the stable kernel tree. Please read: https://www.kernel.org/doc/html/latest/process/stable-kernel-rules.html for how to do this properly.