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Wed, 30 Nov 2022 07:06:11 +0000 From: Xu Yang To: peter.chen@kernel.org Cc: gregkh@linuxfoundation.org, linux-usb@vger.kernel.org, linux-imx@nxp.com, jun.li@nxp.com, xu.yang_2@nxp.com Subject: [PATCH 2/3] usb: chipidea: core: fix possible concurrent when switch role Date: Wed, 30 Nov 2022 15:06:31 +0800 Message-Id: <20221130070631.2443398-1-xu.yang_2@nxp.com> X-Mailer: git-send-email 2.34.1 X-ClientProxiedBy: SI2PR02CA0034.apcprd02.prod.outlook.com (2603:1096:4:195::9) To PA4PR04MB9591.eurprd04.prod.outlook.com (2603:10a6:102:270::18) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: PA4PR04MB9591:EE_|PR3PR04MB7227:EE_ X-MS-Office365-Filtering-Correlation-Id: 73d943ef-07c4-4b30-ffd3-08dad2a15c93 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:PA4PR04MB9591.eurprd04.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230022)(4636009)(366004)(346002)(396003)(376002)(136003)(39860400002)(451199015)(8936002)(5660300002)(36756003)(186003)(66476007)(6916009)(41300700001)(4326008)(66556008)(316002)(8676002)(38100700002)(83380400001)(2616005)(26005)(6512007)(86362001)(478600001)(6486002)(66946007)(52116002)(1076003)(38350700002)(6666004)(6506007)(2906002);DIR:OUT;SFP:1101; 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Unfortunately, the controller may go into chaos in this case. Fix this by protecting it with mutex lock. Fixes: a932a8041ff9 ("usb: chipidea: core: add sysfs group") cc: Signed-off-by: Xu Yang --- drivers/usb/chipidea/ci.h | 2 ++ drivers/usb/chipidea/core.c | 8 +++++++- drivers/usb/chipidea/otg.c | 2 ++ 3 files changed, 11 insertions(+), 1 deletion(-) diff --git a/drivers/usb/chipidea/ci.h b/drivers/usb/chipidea/ci.h index 005c67cb3afb..3424ec0d0b20 100644 --- a/drivers/usb/chipidea/ci.h +++ b/drivers/usb/chipidea/ci.h @@ -208,6 +208,7 @@ struct hw_bank { * @in_lpm: if the core in low power mode * @wakeup_int: if wakeup interrupt occur * @rev: The revision number for controller + * @mutex: protect code from concorrent running */ struct ci_hdrc { struct device *dev; @@ -260,6 +261,7 @@ struct ci_hdrc { bool in_lpm; bool wakeup_int; enum ci_revision rev; + struct mutex mutex; }; static inline struct ci_role_driver *ci_role(struct ci_hdrc *ci) diff --git a/drivers/usb/chipidea/core.c b/drivers/usb/chipidea/core.c index fcb175b22188..d7efde30d59f 100644 --- a/drivers/usb/chipidea/core.c +++ b/drivers/usb/chipidea/core.c @@ -987,8 +987,12 @@ static ssize_t role_store(struct device *dev, if (role == CI_ROLE_END) return -EINVAL; - if (role == ci->role) + mutex_lock(&ci->mutex); + + if (role == ci->role) { + mutex_unlock(&ci->mutex); return n; + } pm_runtime_get_sync(dev); disable_irq(ci->irq); @@ -998,6 +1002,7 @@ static ssize_t role_store(struct device *dev, ci_handle_vbus_change(ci); enable_irq(ci->irq); pm_runtime_put_sync(dev); + mutex_unlock(&ci->mutex); return (ret == 0) ? n : ret; } @@ -1033,6 +1038,7 @@ static int ci_hdrc_probe(struct platform_device *pdev) return -ENOMEM; spin_lock_init(&ci->lock); + mutex_init(&ci->mutex); ci->dev = dev; ci->platdata = dev_get_platdata(dev); ci->imx28_write_fix = !!(ci->platdata->flags & diff --git a/drivers/usb/chipidea/otg.c b/drivers/usb/chipidea/otg.c index 622c3b68aa1e..60a3648461e2 100644 --- a/drivers/usb/chipidea/otg.c +++ b/drivers/usb/chipidea/otg.c @@ -169,6 +169,7 @@ void ci_handle_id_switch(struct ci_hdrc *ci) { enum ci_role role = ci_otg_role(ci); + mutex_lock(&ci->mutex); if (role != ci->role) { dev_dbg(ci->dev, "switching from %s to %s\n", ci_role(ci)->name, ci->roles[role]->name); @@ -198,6 +199,7 @@ void ci_handle_id_switch(struct ci_hdrc *ci) if (role == CI_ROLE_GADGET) ci_handle_vbus_change(ci); } + mutex_unlock(&ci->mutex); } /** * ci_otg_work - perform otg (vbus/id) event handle