From patchwork Fri Nov 2 13:13:55 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Matthijs Kooijman X-Patchwork-Id: 1688641 Return-Path: X-Original-To: patchwork-linux-media@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork2.kernel.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by patchwork2.kernel.org (Postfix) with ESMTP id 4D01FDF2A2 for ; Fri, 2 Nov 2012 13:14:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756667Ab2KBNOf (ORCPT ); Fri, 2 Nov 2012 09:14:35 -0400 Received: from 84-245-11-97.dsl.cambrium.nl ([84.245.11.97]:37227 "EHLO grubby.stderr.nl" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1753358Ab2KBNOe (ORCPT ); Fri, 2 Nov 2012 09:14:34 -0400 Received: from matthijs by grubby.stderr.nl with local (Exim 4.80) (envelope-from ) id 1TUH4z-0005Kz-GA; Fri, 02 Nov 2012 14:14:33 +0100 From: Matthijs Kooijman To: linux-media@vger.kernel.org Cc: Mauro Carvalho Chehab , Stephan Raue , Luis Henriques , Matthijs Kooijman , Jarod Wilson Subject: [PATCH 2/3] [media] rc: Set rdev before irq setup Date: Fri, 2 Nov 2012 14:13:55 +0100 Message-Id: <1351862036-20384-3-git-send-email-matthijs@stdin.nl> X-Mailer: git-send-email 1.7.10 In-Reply-To: <1351862036-20384-1-git-send-email-matthijs@stdin.nl> References: <20121015110111.GD17159@login.drsnuggles.stderr.nl> <1351862036-20384-1-git-send-email-matthijs@stdin.nl> Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org This fixes a problem in fintek-cir and nuvoton-cir where the irq handler would trigger during module load before the rdev member was set, causing a NULL pointer crash. It seems this crash is very reproducible (just bombard the receiver with IR signals during module load), probably because when request_irq is called, any pending intterupt is handled immediately, before request_irq returns and rdev can be set. This same crash was supposed to be fixed by commit 9ef449c6b31bb6a8e6dedc24de475a3b8c79be20 ("[media] rc: Postpone ISR registration"), but the crash was still observed on the nuvoton-cir driver. This commit was tested on nuvoton-cir only. Signed-off-by: Matthijs Kooijman Cc: Jarod Wilson --- drivers/media/rc/fintek-cir.c | 4 +++- drivers/media/rc/nuvoton-cir.c | 3 ++- 2 files changed, 5 insertions(+), 2 deletions(-) diff --git a/drivers/media/rc/fintek-cir.c b/drivers/media/rc/fintek-cir.c index 3d5e57c..5eefe65 100644 --- a/drivers/media/rc/fintek-cir.c +++ b/drivers/media/rc/fintek-cir.c @@ -557,6 +557,8 @@ static int fintek_probe(struct pnp_dev *pdev, const struct pnp_device_id *dev_id /* rx resolution is hardwired to 50us atm, 1, 25, 100 also possible */ rdev->rx_resolution = US_TO_NS(CIR_SAMPLE_PERIOD); + fintek->rdev = rdev; + ret = -EBUSY; /* now claim resources */ if (!request_region(fintek->cir_addr, @@ -572,7 +574,7 @@ static int fintek_probe(struct pnp_dev *pdev, const struct pnp_device_id *dev_id goto exit_free_irq; device_init_wakeup(&pdev->dev, true); - fintek->rdev = rdev; + fit_pr(KERN_NOTICE, "driver has been successfully loaded\n"); if (debug) cir_dump_regs(fintek); diff --git a/drivers/media/rc/nuvoton-cir.c b/drivers/media/rc/nuvoton-cir.c index 3477e23..c6441e6 100644 --- a/drivers/media/rc/nuvoton-cir.c +++ b/drivers/media/rc/nuvoton-cir.c @@ -1065,6 +1065,7 @@ static int nvt_probe(struct pnp_dev *pdev, const struct pnp_device_id *dev_id) /* tx bits */ rdev->tx_resolution = XYZ; #endif + nvt->rdev = rdev; ret = -EBUSY; /* now claim resources */ @@ -1089,7 +1090,7 @@ static int nvt_probe(struct pnp_dev *pdev, const struct pnp_device_id *dev_id) goto exit_free_wake_irq; device_init_wakeup(&pdev->dev, true); - nvt->rdev = rdev; + nvt_pr(KERN_NOTICE, "driver has been successfully loaded\n"); if (debug) { cir_dump_regs(nvt);