From nobody Fri Sep 5 20:09:26 2025 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5FF35C32774 for ; Tue, 23 Aug 2022 11:32:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1349203AbiHWLai (ORCPT ); Tue, 23 Aug 2022 07:30:38 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37830 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1357619AbiHWL0f (ORCPT ); Tue, 23 Aug 2022 07:26:35 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0FB00BE4D6; Tue, 23 Aug 2022 02:24:12 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 2D4D2B81C66; Tue, 23 Aug 2022 09:24:11 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 77FDBC433D6; Tue, 23 Aug 2022 09:24:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1661246649; bh=28Uj1pz2wv0sJBienNbuzVHt1ORzGBQoYdH6V0l/0lc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=UjN9A2GQ4M9kk2unohgoHjbzoAcHA0/WeV5w44zHQfJxTYxaEQ7VaNIxIwPGtVNVP ghzTdWjNgcSmimh+VtRIqls1S6h7VILWC3i0lZmaMNGlW+KHHeGfNgNZXrrP02VIZ0 NhOiVnc6rvpP1Bvl1SxqxR1++55vpKWR0AWqUJHE= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Duoming Zhou , Sasha Levin Subject: [PATCH 5.4 177/389] staging: rtl8192u: Fix sleep in atomic context bug in dm_fsync_timer_callback Date: Tue, 23 Aug 2022 10:24:15 +0200 Message-Id: <20220823080123.037967159@linuxfoundation.org> X-Mailer: git-send-email 2.37.2 In-Reply-To: <20220823080115.331990024@linuxfoundation.org> References: <20220823080115.331990024@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" From: Duoming Zhou [ Upstream commit 6a0c054930d554ad8f8044ef1fc856d9da391c81 ] There are sleep in atomic context bugs when dm_fsync_timer_callback is executing. The root cause is that the memory allocation functions with GFP_KERNEL or GFP_NOIO parameters are called in dm_fsync_timer_callback which is a timer handler. The call paths that could trigger bugs are shown below: (interrupt context) dm_fsync_timer_callback write_nic_byte kzalloc(sizeof(data), GFP_KERNEL); //may sleep usb_control_msg kmalloc(.., GFP_NOIO); //may sleep write_nic_dword kzalloc(sizeof(data), GFP_KERNEL); //may sleep usb_control_msg kmalloc(.., GFP_NOIO); //may sleep This patch uses delayed work to replace timer and moves the operations that may sleep into the delayed work in order to mitigate bugs. Fixes: 8fc8598e61f6 ("Staging: Added Realtek rtl8192u driver to staging") Signed-off-by: Duoming Zhou Link: https://lore.kernel.org/r/20220710103002.63283-1-duoming@zju.edu.cn Signed-off-by: Greg Kroah-Hartman Signed-off-by: Sasha Levin --- drivers/staging/rtl8192u/r8192U.h | 2 +- drivers/staging/rtl8192u/r8192U_dm.c | 38 +++++++++++++--------------- drivers/staging/rtl8192u/r8192U_dm.h | 2 +- 3 files changed, 20 insertions(+), 22 deletions(-) diff --git a/drivers/staging/rtl8192u/r8192U.h b/drivers/staging/rtl8192u/r= 8192U.h index ec33fb9122e9..57badc1e91e3 100644 --- a/drivers/staging/rtl8192u/r8192U.h +++ b/drivers/staging/rtl8192u/r8192U.h @@ -1013,7 +1013,7 @@ typedef struct r8192_priv { bool bis_any_nonbepkts; bool bcurrent_turbo_EDCA; bool bis_cur_rdlstate; - struct timer_list fsync_timer; + struct delayed_work fsync_work; bool bfsync_processing; /* 500ms Fsync timer is active or not */ u32 rate_record; u32 rateCountDiffRecord; diff --git a/drivers/staging/rtl8192u/r8192U_dm.c b/drivers/staging/rtl8192= u/r8192U_dm.c index c23e43b095d9..30b272da36f5 100644 --- a/drivers/staging/rtl8192u/r8192U_dm.c +++ b/drivers/staging/rtl8192u/r8192U_dm.c @@ -2585,19 +2585,20 @@ static void dm_init_fsync(struct net_device *dev) priv->ieee80211->fsync_seconddiff_ratethreshold =3D 200; priv->ieee80211->fsync_state =3D Default_Fsync; priv->framesyncMonitor =3D 1; /* current default 0xc38 monitor on */ - timer_setup(&priv->fsync_timer, dm_fsync_timer_callback, 0); + INIT_DELAYED_WORK(&priv->fsync_work, dm_fsync_work_callback); } =20 static void dm_deInit_fsync(struct net_device *dev) { struct r8192_priv *priv =3D ieee80211_priv(dev); =20 - del_timer_sync(&priv->fsync_timer); + cancel_delayed_work_sync(&priv->fsync_work); } =20 -void dm_fsync_timer_callback(struct timer_list *t) +void dm_fsync_work_callback(struct work_struct *work) { - struct r8192_priv *priv =3D from_timer(priv, t, fsync_timer); + struct r8192_priv *priv =3D + container_of(work, struct r8192_priv, fsync_work.work); struct net_device *dev =3D priv->ieee80211->dev; u32 rate_index, rate_count =3D 0, rate_count_diff =3D 0; bool bSwitchFromCountDiff =3D false; @@ -2664,17 +2665,16 @@ void dm_fsync_timer_callback(struct timer_list *t) } } if (bDoubleTimeInterval) { - if (timer_pending(&priv->fsync_timer)) - del_timer_sync(&priv->fsync_timer); - priv->fsync_timer.expires =3D jiffies + - msecs_to_jiffies(priv->ieee80211->fsync_time_interval*priv->ieee80211-= >fsync_multiple_timeinterval); - add_timer(&priv->fsync_timer); + cancel_delayed_work_sync(&priv->fsync_work); + schedule_delayed_work(&priv->fsync_work, + msecs_to_jiffies(priv + ->ieee80211->fsync_time_interval * + priv->ieee80211->fsync_multiple_timeinterval)); } else { - if (timer_pending(&priv->fsync_timer)) - del_timer_sync(&priv->fsync_timer); - priv->fsync_timer.expires =3D jiffies + - msecs_to_jiffies(priv->ieee80211->fsync_time_interval); - add_timer(&priv->fsync_timer); + cancel_delayed_work_sync(&priv->fsync_work); + schedule_delayed_work(&priv->fsync_work, + msecs_to_jiffies(priv + ->ieee80211->fsync_time_interval)); } } else { /* Let Register return to default value; */ @@ -2702,7 +2702,7 @@ static void dm_EndSWFsync(struct net_device *dev) struct r8192_priv *priv =3D ieee80211_priv(dev); =20 RT_TRACE(COMP_HALDM, "%s\n", __func__); - del_timer_sync(&(priv->fsync_timer)); + cancel_delayed_work_sync(&priv->fsync_work); =20 /* Let Register return to default value; */ if (priv->bswitch_fsync) { @@ -2744,11 +2744,9 @@ static void dm_StartSWFsync(struct net_device *dev) if (priv->ieee80211->fsync_rate_bitmap & rateBitmap) priv->rate_record +=3D priv->stats.received_rate_histogram[1][rateIndex= ]; } - if (timer_pending(&priv->fsync_timer)) - del_timer_sync(&priv->fsync_timer); - priv->fsync_timer.expires =3D jiffies + - msecs_to_jiffies(priv->ieee80211->fsync_time_interval); - add_timer(&priv->fsync_timer); + cancel_delayed_work_sync(&priv->fsync_work); + schedule_delayed_work(&priv->fsync_work, + msecs_to_jiffies(priv->ieee80211->fsync_time_interval)); =20 write_nic_dword(dev, rOFDM0_RxDetector2, 0x465c12cd); =20 diff --git a/drivers/staging/rtl8192u/r8192U_dm.h b/drivers/staging/rtl8192= u/r8192U_dm.h index 0b2a1c688597..2159018b4e38 100644 --- a/drivers/staging/rtl8192u/r8192U_dm.h +++ b/drivers/staging/rtl8192u/r8192U_dm.h @@ -166,7 +166,7 @@ void dm_force_tx_fw_info(struct net_device *dev, void dm_init_edca_turbo(struct net_device *dev); void dm_rf_operation_test_callback(unsigned long data); void dm_rf_pathcheck_workitemcallback(struct work_struct *work); -void dm_fsync_timer_callback(struct timer_list *t); +void dm_fsync_work_callback(struct work_struct *work); void dm_cck_txpower_adjust(struct net_device *dev, bool binch14); void dm_shadow_init(struct net_device *dev); void dm_initialize_txpower_tracking(struct net_device *dev); --=20 2.35.1