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=-6.8 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,URIBL_BLOCKED,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 329AAC3A5A8 for ; Wed, 4 Sep 2019 18:15:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 002C222CEA for ; Wed, 4 Sep 2019 18:15:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1567620949; bh=UbwxphCkJgqkkmqkEGI327ZtsTfNouQD7+qWRvtcpI0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=IVfUQsvD2Q97xz5vHH4lUXiS62r2DGjKud29uLIW5Rgt8iFFVctU2kZ3LHw+wToUW Wcf7kBPQ4g1ARUkJaybA9X0xFgucoTnuB7nihWv5o+7HTRtDb7yENViRN33p3uZ7/7 Na6CETj86ERKAUcCRKcPge0SnydmcO25+UEksUg8= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2391012AbfIDSPs (ORCPT ); Wed, 4 Sep 2019 14:15:48 -0400 Received: from mail.kernel.org ([198.145.29.99]:32824 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2390393AbfIDSP3 (ORCPT ); Wed, 4 Sep 2019 14:15:29 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (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 9E44F2087E; Wed, 4 Sep 2019 18:15:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1567620929; bh=UbwxphCkJgqkkmqkEGI327ZtsTfNouQD7+qWRvtcpI0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=LJATrdsI1qtyD4e0xUfQIx7wwktQ+SgtFjUUKeEQv+hGmdLcIyL7zmhzjIgHQ0oPv XfLqRclFriEhK0NbzqydTIW92eADE5dhR1vlZa6fHXKNqYhkT6Er/3BgD3nwuNsk3f QzY87z+Rl2R2j2MJdQDCCqAcxp9xTdhQJs9zf6cM= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, John Garry , Wei Xu Subject: [PATCH 5.2 108/143] lib: logic_pio: Avoid possible overlap for unregistering regions Date: Wed, 4 Sep 2019 19:54:11 +0200 Message-Id: <20190904175318.625979109@linuxfoundation.org> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20190904175314.206239922@linuxfoundation.org> References: <20190904175314.206239922@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: John Garry commit 0a27142bd1ee259e24a0be2b0133e5ca5df8da91 upstream. The code was originally written to not support unregistering logical PIO regions. To accommodate supporting unregistering logical PIO regions, subtly modify LOGIC_PIO_CPU_MMIO region registration code, such that the "end" of the registered regions is the "end" of the last region, and not the sum of the sizes of all the registered regions. Cc: stable@vger.kernel.org Signed-off-by: John Garry Signed-off-by: Wei Xu Signed-off-by: Greg Kroah-Hartman --- lib/logic_pio.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) --- a/lib/logic_pio.c +++ b/lib/logic_pio.c @@ -35,7 +35,7 @@ int logic_pio_register_range(struct logi struct logic_pio_hwaddr *range; resource_size_t start; resource_size_t end; - resource_size_t mmio_sz = 0; + resource_size_t mmio_end = 0; resource_size_t iio_sz = MMIO_UPPER_LIMIT; int ret = 0; @@ -56,7 +56,7 @@ int logic_pio_register_range(struct logi /* for MMIO ranges we need to check for overlap */ if (start >= range->hw_start + range->size || end < range->hw_start) { - mmio_sz += range->size; + mmio_end = range->io_start + range->size; } else { ret = -EFAULT; goto end_register; @@ -69,16 +69,16 @@ int logic_pio_register_range(struct logi /* range not registered yet, check for available space */ if (new_range->flags == LOGIC_PIO_CPU_MMIO) { - if (mmio_sz + new_range->size - 1 > MMIO_UPPER_LIMIT) { + if (mmio_end + new_range->size - 1 > MMIO_UPPER_LIMIT) { /* if it's too big check if 64K space can be reserved */ - if (mmio_sz + SZ_64K - 1 > MMIO_UPPER_LIMIT) { + if (mmio_end + SZ_64K - 1 > MMIO_UPPER_LIMIT) { ret = -E2BIG; goto end_register; } new_range->size = SZ_64K; pr_warn("Requested IO range too big, new size set to 64K\n"); } - new_range->io_start = mmio_sz; + new_range->io_start = mmio_end; } else if (new_range->flags == LOGIC_PIO_INDIRECT) { if (iio_sz + new_range->size - 1 > IO_SPACE_LIMIT) { ret = -E2BIG;