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=-3.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS autolearn=no 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 96204C433E0 for ; Thu, 21 May 2020 18:49:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5BECA208C9 for ; Thu, 21 May 2020 18:49:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1590086948; bh=MQiydCJAeNQDDg6xvAARulcUycFi5vbJdxdeJlhzfDE=; h=Date:From:To:Cc:Subject:In-Reply-To:References:List-ID:From; b=HB5cQe4rV7I7pGv1xAQCiezG6I02I80gBlKk1NCCPTcx4DP0Zs9g49pbMdJBd6yft IUfqQVyv6ONXA6PMB9zBXaPd9s3Ytzs1UfDdRpNehsl+W/lFbeVws+F2vdfV/NoMEN 9EHGlsCkCTJshY3dWQ2O4vWS1G3JGtYCCSJIT3Tc= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729660AbgEUStH (ORCPT ); Thu, 21 May 2020 14:49:07 -0400 Received: from mail.kernel.org ([198.145.29.99]:45624 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729555AbgEUStH (ORCPT ); Thu, 21 May 2020 14:49:07 -0400 Received: from localhost.localdomain (c-73-231-172-41.hsd1.ca.comcast.net [73.231.172.41]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id C68EB2088E; Thu, 21 May 2020 18:49:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1590086947; bh=MQiydCJAeNQDDg6xvAARulcUycFi5vbJdxdeJlhzfDE=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=QKmNH2VvPf57Na/zQ2gmA79CWHOkhxYqCWUHTz8GymARd56PJRzMnMs2ugMmGlMSL lWg2YzYv8S365N3SrLlBdxy2pcfoDtWYkKRmnetUqoAv3ba8S13xoQ2kkTYRrFJYT0 oG6yUhQgBGpz9WjQLfD8WBJ0b6BuVT+DUGET+qBQ= Date: Thu, 21 May 2020 11:49:06 -0700 From: Andrew Morton To: Prakash Gupta Cc: mhocko@suse.com, joro@8bytes.org, iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: Re: [PATCH] iommu/dma: limit iova free size to unmmaped iova Message-Id: <20200521114906.2f38fc04d3600d41f3409bd9@linux-foundation.org> In-Reply-To: <20200521113004.12438-1-guptap@codeaurora.org> References: <20200521113004.12438-1-guptap@codeaurora.org> X-Mailer: Sylpheed 3.5.1 (GTK+ 2.24.31; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, 21 May 2020 17:00:04 +0530 Prakash Gupta wrote: > Limit the iova size while freeing based on unmapped size. In absence of > this even with unmap failure, invalid iova is pushed to iova rcache and > subsequently can cause panic while rcache magazine is freed. > > Signed-off-by: Prakash Gupta > I think we need a cc:stable here? > --- a/drivers/iommu/dma-iommu.c > +++ b/drivers/iommu/dma-iommu.c > @@ -472,7 +472,8 @@ static void __iommu_dma_unmap(struct device *dev, dma_addr_t dma_addr, > > if (!cookie->fq_domain) > iommu_tlb_sync(domain, &iotlb_gather); > - iommu_dma_free_iova(cookie, dma_addr, size); > + if (unmapped) > + iommu_dma_free_iova(cookie, dma_addr, unmapped); > } > > static dma_addr_t __iommu_dma_map(struct device *dev, phys_addr_t phys, I'll assume that Joerg will handle this fix?