From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S964906Ab1LPTxW (ORCPT ); Fri, 16 Dec 2011 14:53:22 -0500 Received: from cantor2.suse.de ([195.135.220.15]:45220 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S964814Ab1LPTvi (ORCPT ); Fri, 16 Dec 2011 14:51:38 -0500 X-Mailbox-Line: From gregkh@clark.kroah.org Fri Dec 16 11:42:09 2011 Message-Id: <20111216194209.531841867@clark.kroah.org> User-Agent: quilt/0.50-24.1 Date: Fri, 16 Dec 2011 11:40:24 -0800 From: Greg KH To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: torvalds@linux-foundation.org, akpm@linux-foundation.org, alan@lxorguk.ukuu.org.uk, Allen Kay , David Woodhouse , Youquan Song Subject: [17/45] intel-iommu: fix return value of iommu_unmap() API In-Reply-To: <20111216194603.GA15028@kroah.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 3.0-stable review patch. If anyone has any objections, please let me know. ------------------ From: Allen Kay commit 292827cb164ad00cc7689a21283b1261c0b6daed upstream. iommu_unmap() API expects IOMMU drivers to return the actual page order of the address being unmapped. Previous code was just returning page order passed in from the caller. This patch fixes this problem. Signed-off-by: Allen Kay Signed-off-by: David Woodhouse Signed-off-by: Youquan Song Signed-off-by: Greg Kroah-Hartman --- drivers/pci/intel-iommu.c | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-) --- a/drivers/pci/intel-iommu.c +++ b/drivers/pci/intel-iommu.c @@ -817,13 +817,14 @@ static struct dma_pte *dma_pfn_level_pte } /* clear last level pte, a tlb flush should be followed */ -static void dma_pte_clear_range(struct dmar_domain *domain, +static int dma_pte_clear_range(struct dmar_domain *domain, unsigned long start_pfn, unsigned long last_pfn) { int addr_width = agaw_to_width(domain->agaw) - VTD_PAGE_SHIFT; unsigned int large_page = 1; struct dma_pte *first_pte, *pte; + int order; BUG_ON(addr_width < BITS_PER_LONG && start_pfn >> addr_width); BUG_ON(addr_width < BITS_PER_LONG && last_pfn >> addr_width); @@ -847,6 +848,9 @@ static void dma_pte_clear_range(struct d (void *)pte - (void *)first_pte); } while (start_pfn && start_pfn <= last_pfn); + + order = (large_page - 1) * 9; + return order; } /* free page table pages. last level pte should already be cleared */ @@ -3865,14 +3869,15 @@ static int intel_iommu_unmap(struct iomm { struct dmar_domain *dmar_domain = domain->priv; size_t size = PAGE_SIZE << gfp_order; + int order; - dma_pte_clear_range(dmar_domain, iova >> VTD_PAGE_SHIFT, + order = dma_pte_clear_range(dmar_domain, iova >> VTD_PAGE_SHIFT, (iova + size - 1) >> VTD_PAGE_SHIFT); if (dmar_domain->max_addr == iova + size) dmar_domain->max_addr = iova; - return gfp_order; + return order; } static phys_addr_t intel_iommu_iova_to_phys(struct iommu_domain *domain,