From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932089AbcEQJcj (ORCPT ); Tue, 17 May 2016 05:32:39 -0400 Received: from wes1-so1.wedos.net ([46.28.106.15]:44552 "EHLO wes1-so1.wedos.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753399AbcEQJcN (ORCPT ); Tue, 17 May 2016 05:32:13 -0400 From: Jan Viktorin To: devicetree@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Jan Viktorin , Rob Herring , Pawel Moll , Mark Rutland , Ian Campbell , Kumar Gala , "Hans J. Koch" , Greg Kroah-Hartman Subject: [PATCH 1/4] uio: fix dmem_region_start computation Date: Tue, 17 May 2016 11:22:17 +0200 Message-Id: <1463476940-26791-2-git-send-email-viktorin@rehivetech.com> X-Mailer: git-send-email 2.8.0 In-Reply-To: <1463476940-26791-1-git-send-email-viktorin@rehivetech.com> References: <1463476940-26791-1-git-send-email-viktorin@rehivetech.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The variable i contains a total number of resources (including IORESOURCE_IRQ). However, we want the dmem_region_start to point after the last resource of type IORESOURCE_MEM. The original behaviour leads (very likely) to skipping several UIO mapping regions and makes them useless. Fix this by computing dmem_region_start from the uiomem which points to the last used UIO mapping. Fixes: 0a0c3b5a24bd ("Add new uio device for dynamic memory allocation") Signed-off-by: Jan Viktorin --- drivers/uio/uio_dmem_genirq.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/uio/uio_dmem_genirq.c b/drivers/uio/uio_dmem_genirq.c index 915facb..e1134a4 100644 --- a/drivers/uio/uio_dmem_genirq.c +++ b/drivers/uio/uio_dmem_genirq.c @@ -229,7 +229,7 @@ static int uio_dmem_genirq_probe(struct platform_device *pdev) ++uiomem; } - priv->dmem_region_start = i; + priv->dmem_region_start = uiomem - &uioinfo->mem[0]; priv->num_dmem_regions = pdata->num_dynamic_regions; for (i = 0; i < pdata->num_dynamic_regions; ++i) { -- 2.8.0