From patchwork Tue Mar 31 08:59:27 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 228706 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=-6.9 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 A4869C43331 for ; Tue, 31 Mar 2020 09:01:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 77DB920848 for ; Tue, 31 Mar 2020 09:01:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1585645269; bh=gFz0AHUfNBGQrSN7xcAOj65QeONXXdylWCBDDmIvE3A=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=IQGGiJcBMEzBHi7IztFTCY0E5G/XxKwO/un6mGcn6Ob+I6ayOdmUt0e64ay7FsjMc VY6OssYEouElSHmXTjp9+m4c9jJAIUz34A9mvAzFvWpyrOyPolMIGbT1EGqt1nm4TQ Q0cIqFDyWoOqMs9uBe4LHRcOPoYdFhJB2C5sFfdY= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730506AbgCaJBI (ORCPT ); Tue, 31 Mar 2020 05:01:08 -0400 Received: from mail.kernel.org ([198.145.29.99]:40164 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730490AbgCaJBH (ORCPT ); Tue, 31 Mar 2020 05:01:07 -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 E737120848; Tue, 31 Mar 2020 09:01:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1585645266; bh=gFz0AHUfNBGQrSN7xcAOj65QeONXXdylWCBDDmIvE3A=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=z0Kx/FkVffIszYzLV0cDg5l3Z4XpIHOceMWnIBB/YBz0yK/ajiVNSef6ZYtuAHYrt hLx7b40fPChC8paddgXKC/AoKQOsuvp/djFYdpuO9xL7/2YMSm64xmBXZ72fwQ7L9c ngQNiNjfDwKBFbnLiosZnn2Lpkb3R9NwNag1W8MM= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, =?utf-8?b?TWljaGHFgiBNaXJvc8WCYXc=?= , =?utf-8?b?SsOpcsO0bWUgUG91aWxsZXI=?= Subject: [PATCH 5.6 15/23] staging: wfx: fix init/remove vs IRQ race Date: Tue, 31 Mar 2020 10:59:27 +0200 Message-Id: <20200331085315.125120268@linuxfoundation.org> X-Mailer: git-send-email 2.26.0 In-Reply-To: <20200331085308.098696461@linuxfoundation.org> References: <20200331085308.098696461@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Michał Mirosław commit 4033714d6cbe04893aa0708d1fcaa45dd8eb3f53 upstream. Current code races in init/exit with interrupt handlers. This is noticed by the warning below. Fix it by using devres for ordering allocations and IRQ de/registration. WARNING: CPU: 0 PID: 827 at drivers/staging/wfx/bus_spi.c:142 wfx_spi_irq_handler+0x5c/0x64 [wfx] race condition in driver init/deinit Cc: stable@vger.kernel.org Fixes: 0096214a59a7 ("staging: wfx: add support for I/O access") Signed-off-by: Michał Mirosław Reviewed-by: Jérôme Pouiller Link: https://lore.kernel.org/r/f0c66cbb3110c2736cd4357c753fba8c14ee3aee.1581416843.git.mirq-linux@rere.qmqm.pl Signed-off-by: Greg Kroah-Hartman --- drivers/staging/wfx/bus_sdio.c | 15 ++++++--------- drivers/staging/wfx/bus_spi.c | 27 ++++++++++++++------------- drivers/staging/wfx/main.c | 21 +++++++++++++-------- drivers/staging/wfx/main.h | 1 - 4 files changed, 33 insertions(+), 31 deletions(-) --- a/drivers/staging/wfx/bus_sdio.c +++ b/drivers/staging/wfx/bus_sdio.c @@ -200,25 +200,23 @@ static int wfx_sdio_probe(struct sdio_fu if (ret) goto err0; - ret = wfx_sdio_irq_subscribe(bus); - if (ret) - goto err1; - bus->core = wfx_init_common(&func->dev, &wfx_sdio_pdata, &wfx_sdio_hwbus_ops, bus); if (!bus->core) { ret = -EIO; - goto err2; + goto err1; } + ret = wfx_sdio_irq_subscribe(bus); + if (ret) + goto err1; + ret = wfx_probe(bus->core); if (ret) - goto err3; + goto err2; return 0; -err3: - wfx_free_common(bus->core); err2: wfx_sdio_irq_unsubscribe(bus); err1: @@ -234,7 +232,6 @@ static void wfx_sdio_remove(struct sdio_ struct wfx_sdio_priv *bus = sdio_get_drvdata(func); wfx_release(bus->core); - wfx_free_common(bus->core); wfx_sdio_irq_unsubscribe(bus); sdio_claim_host(func); sdio_disable_func(func); --- a/drivers/staging/wfx/bus_spi.c +++ b/drivers/staging/wfx/bus_spi.c @@ -156,6 +156,11 @@ static void wfx_spi_request_rx(struct wo wfx_bh_request_rx(bus->core); } +static void wfx_flush_irq_work(void *w) +{ + flush_work(w); +} + static size_t wfx_spi_align_size(void *priv, size_t size) { // Most of SPI controllers avoid DMA if buffer size is not 32bit aligned @@ -211,22 +216,23 @@ static int wfx_spi_probe(struct spi_devi udelay(2000); } - ret = devm_request_irq(&func->dev, func->irq, wfx_spi_irq_handler, - IRQF_TRIGGER_RISING, "wfx", bus); - if (ret) - return ret; - INIT_WORK(&bus->request_rx, wfx_spi_request_rx); bus->core = wfx_init_common(&func->dev, &wfx_spi_pdata, &wfx_spi_hwbus_ops, bus); if (!bus->core) return -EIO; - ret = wfx_probe(bus->core); + ret = devm_add_action_or_reset(&func->dev, wfx_flush_irq_work, + &bus->request_rx); if (ret) - wfx_free_common(bus->core); + return ret; + + ret = devm_request_irq(&func->dev, func->irq, wfx_spi_irq_handler, + IRQF_TRIGGER_RISING, "wfx", bus); + if (ret) + return ret; - return ret; + return wfx_probe(bus->core); } static int wfx_spi_remove(struct spi_device *func) @@ -234,11 +240,6 @@ static int wfx_spi_remove(struct spi_dev struct wfx_spi_priv *bus = spi_get_drvdata(func); wfx_release(bus->core); - wfx_free_common(bus->core); - // A few IRQ will be sent during device release. Hopefully, no IRQ - // should happen after wdev/wvif are released. - devm_free_irq(&func->dev, func->irq, bus); - flush_work(&bus->request_rx); return 0; } --- a/drivers/staging/wfx/main.c +++ b/drivers/staging/wfx/main.c @@ -262,6 +262,16 @@ static int wfx_send_pdata_pds(struct wfx return ret; } +static void wfx_free_common(void *data) +{ + struct wfx_dev *wdev = data; + + mutex_destroy(&wdev->rx_stats_lock); + mutex_destroy(&wdev->conf_mutex); + wfx_tx_queues_deinit(wdev); + ieee80211_free_hw(wdev->hw); +} + struct wfx_dev *wfx_init_common(struct device *dev, const struct wfx_platform_data *pdata, const struct hwbus_ops *hwbus_ops, @@ -332,15 +342,10 @@ struct wfx_dev *wfx_init_common(struct d wfx_init_hif_cmd(&wdev->hif_cmd); wfx_tx_queues_init(wdev); - return wdev; -} + if (devm_add_action_or_reset(dev, wfx_free_common, wdev)) + return NULL; -void wfx_free_common(struct wfx_dev *wdev) -{ - mutex_destroy(&wdev->rx_stats_lock); - mutex_destroy(&wdev->conf_mutex); - wfx_tx_queues_deinit(wdev); - ieee80211_free_hw(wdev->hw); + return wdev; } int wfx_probe(struct wfx_dev *wdev) --- a/drivers/staging/wfx/main.h +++ b/drivers/staging/wfx/main.h @@ -34,7 +34,6 @@ struct wfx_dev *wfx_init_common(struct d const struct wfx_platform_data *pdata, const struct hwbus_ops *hwbus_ops, void *hwbus_priv); -void wfx_free_common(struct wfx_dev *wdev); int wfx_probe(struct wfx_dev *wdev); void wfx_release(struct wfx_dev *wdev);