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Sun, 18 Aug 2024 23:17:38 GMT Received: from hu-bjorande-lv.qualcomm.com (10.49.16.6) by nalasex01c.na.qualcomm.com (10.47.97.35) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.9; Sun, 18 Aug 2024 16:17:38 -0700 From: Bjorn Andersson Date: Sun, 18 Aug 2024 16:17:38 -0700 Subject: [PATCH 2/3] usb: typec: ucsi: Move unregister out of atomic section Precedence: bulk X-Mailing-List: linux-usb@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-ID: <20240818-pmic-glink-v6-11-races-v1-2-f87c577e0bc9@quicinc.com> References: <20240818-pmic-glink-v6-11-races-v1-0-f87c577e0bc9@quicinc.com> In-Reply-To: <20240818-pmic-glink-v6-11-races-v1-0-f87c577e0bc9@quicinc.com> To: Sebastian Reichel , Bjorn Andersson , Konrad Dybcio , "Heikki Krogerus" , Greg Kroah-Hartman , Neil Armstrong CC: Johan Hovold , Chris Lew , Dmitry Baryshkov , Stephen Boyd , Amit Pundir , , , , , Bjorn Andersson , X-Mailer: b4 0.13.0 X-Developer-Signature: v=1; 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This means that ucsi_unregister() is now called from IRQ context, which isn't feasible as it's expecting a sleepable context. An effort is under way to get GLINK to invoke its callbacks in a sleepable context, but until then lets schedule the unregistration. A side effect of this is that ucsi_unregister() can now happen after the remote processor, and thereby the communication link with it, is gone. pmic_glink_send() is amended with a check to avoid the resulting NULL pointer dereference, but it becomes expecting to see a failing send upon shutting down the remote processor (e.g. during a restart following a firmware crash): ucsi_glink.pmic_glink_ucsi pmic_glink.ucsi.0: failed to send UCSI write request: -5 Fixes: caa855189104 ("soc: qcom: pmic_glink: Fix race during initialization") Cc: stable@vger.kernel.org Signed-off-by: Bjorn Andersson Reviewed-by: Dmitry Baryshkov Reviewed-by: Neil Armstrong Reviewed-by: Heikki Krogerus --- drivers/soc/qcom/pmic_glink.c | 10 +++++++++- drivers/usb/typec/ucsi/ucsi_glink.c | 28 +++++++++++++++++++++++----- 2 files changed, 32 insertions(+), 6 deletions(-) diff --git a/drivers/soc/qcom/pmic_glink.c b/drivers/soc/qcom/pmic_glink.c index 58ec91767d79..e4747f1d3da5 100644 --- a/drivers/soc/qcom/pmic_glink.c +++ b/drivers/soc/qcom/pmic_glink.c @@ -112,8 +112,16 @@ EXPORT_SYMBOL_GPL(pmic_glink_register_client); int pmic_glink_send(struct pmic_glink_client *client, void *data, size_t len) { struct pmic_glink *pg = client->pg; + int ret; - return rpmsg_send(pg->ept, data, len); + mutex_lock(&pg->state_lock); + if (!pg->ept) + ret = -ECONNRESET; + else + ret = rpmsg_send(pg->ept, data, len); + mutex_unlock(&pg->state_lock); + + return ret; } EXPORT_SYMBOL_GPL(pmic_glink_send); diff --git a/drivers/usb/typec/ucsi/ucsi_glink.c b/drivers/usb/typec/ucsi/ucsi_glink.c index ac53a81c2a81..a33056eec83d 100644 --- a/drivers/usb/typec/ucsi/ucsi_glink.c +++ b/drivers/usb/typec/ucsi/ucsi_glink.c @@ -68,6 +68,9 @@ struct pmic_glink_ucsi { struct work_struct notify_work; struct work_struct register_work; + spinlock_t state_lock; + unsigned int pdr_state; + unsigned int new_pdr_state; u8 read_buf[UCSI_BUF_SIZE]; }; @@ -244,8 +247,22 @@ static void pmic_glink_ucsi_notify(struct work_struct *work) static void pmic_glink_ucsi_register(struct work_struct *work) { struct pmic_glink_ucsi *ucsi = container_of(work, struct pmic_glink_ucsi, register_work); + unsigned long flags; + unsigned int new_state; + + spin_lock_irqsave(&ucsi->state_lock, flags); + new_state = ucsi->new_pdr_state; + spin_unlock_irqrestore(&ucsi->state_lock, flags); + + if (ucsi->pdr_state != SERVREG_SERVICE_STATE_UP) { + if (new_state == SERVREG_SERVICE_STATE_UP) + ucsi_register(ucsi->ucsi); + } else { + if (new_state == SERVREG_SERVICE_STATE_DOWN) + ucsi_unregister(ucsi->ucsi); + } - ucsi_register(ucsi->ucsi); + ucsi->pdr_state = new_state; } static void pmic_glink_ucsi_callback(const void *data, size_t len, void *priv) @@ -269,11 +286,12 @@ static void pmic_glink_ucsi_callback(const void *data, size_t len, void *priv) static void pmic_glink_ucsi_pdr_notify(void *priv, int state) { struct pmic_glink_ucsi *ucsi = priv; + unsigned long flags; - if (state == SERVREG_SERVICE_STATE_UP) - schedule_work(&ucsi->register_work); - else if (state == SERVREG_SERVICE_STATE_DOWN) - ucsi_unregister(ucsi->ucsi); + spin_lock_irqsave(&ucsi->state_lock, flags); + ucsi->new_pdr_state = state; + spin_unlock_irqrestore(&ucsi->state_lock, flags); + schedule_work(&ucsi->register_work); } static void pmic_glink_ucsi_destroy(void *data)