From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-qt0-f199.google.com (mail-qt0-f199.google.com [209.85.216.199]) by kanga.kvack.org (Postfix) with ESMTP id 585DF6B038F for ; Fri, 17 Mar 2017 20:55:17 -0400 (EDT) Received: by mail-qt0-f199.google.com with SMTP id n37so79890741qtb.7 for ; Fri, 17 Mar 2017 17:55:17 -0700 (PDT) Received: from mail-qt0-f171.google.com (mail-qt0-f171.google.com. [209.85.216.171]) by mx.google.com with ESMTPS id g17si7701007qta.51.2017.03.17.17.55.16 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 17 Mar 2017 17:55:16 -0700 (PDT) Received: by mail-qt0-f171.google.com with SMTP id n21so75239784qta.1 for ; Fri, 17 Mar 2017 17:55:16 -0700 (PDT) From: Laura Abbott Subject: [RFC PATCHv2 05/21] staging: android: ion: Duplicate sg_table Date: Fri, 17 Mar 2017 17:54:37 -0700 Message-Id: <1489798493-16600-6-git-send-email-labbott@redhat.com> In-Reply-To: <1489798493-16600-1-git-send-email-labbott@redhat.com> References: <1489798493-16600-1-git-send-email-labbott@redhat.com> Sender: owner-linux-mm@kvack.org List-ID: To: Sumit Semwal , Riley Andrews , arve@android.com Cc: Laura Abbott , romlem@google.com, devel@driverdev.osuosl.org, linux-kernel@vger.kernel.org, linaro-mm-sig@lists.linaro.org, Greg Kroah-Hartman , linux-arm-kernel@lists.infradead.org, linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org, Brian Starkey , Daniel Vetter , Mark Brown , Benjamin Gaignard , linux-mm@kvack.org, Laurent Pinchart Ion currently returns a single sg_table on each dma_map call. This is incorrect for later usage. Signed-off-by: Laura Abbott --- drivers/staging/android/ion/ion.c | 30 +++++++++++++++++++++++++++++- 1 file changed, 29 insertions(+), 1 deletion(-) diff --git a/drivers/staging/android/ion/ion.c b/drivers/staging/android/ion/ion.c index c2adfe1..7dcb8a9 100644 --- a/drivers/staging/android/ion/ion.c +++ b/drivers/staging/android/ion/ion.c @@ -800,6 +800,32 @@ static void ion_buffer_sync_for_device(struct ion_buffer *buffer, struct device *dev, enum dma_data_direction direction); +static struct sg_table *dup_sg_table(struct sg_table *table) +{ + struct sg_table *new_table; + int ret, i; + struct scatterlist *sg, *new_sg; + + new_table = kzalloc(sizeof(*new_table), GFP_KERNEL); + if (!new_table) + return ERR_PTR(-ENOMEM); + + ret = sg_alloc_table(new_table, table->nents, GFP_KERNEL); + if (ret) { + kfree(new_table); + return ERR_PTR(-ENOMEM); + } + + new_sg = new_table->sgl; + for_each_sg(table->sgl, sg, table->nents, i) { + memcpy(new_sg, sg, sizeof(*sg)); + sg->dma_address = 0; + new_sg = sg_next(new_sg); + } + + return new_table; +} + static struct sg_table *ion_map_dma_buf(struct dma_buf_attachment *attachment, enum dma_data_direction direction) { @@ -807,13 +833,15 @@ static struct sg_table *ion_map_dma_buf(struct dma_buf_attachment *attachment, struct ion_buffer *buffer = dmabuf->priv; ion_buffer_sync_for_device(buffer, attachment->dev, direction); - return buffer->sg_table; + return dup_sg_table(buffer->sg_table); } static void ion_unmap_dma_buf(struct dma_buf_attachment *attachment, struct sg_table *table, enum dma_data_direction direction) { + sg_free_table(table); + kfree(table); } void ion_pages_sync_for_device(struct device *dev, struct page *page, -- 2.7.4 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org