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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman , Chris Lew , Pranav Mahesh Phansalkar , Deepak Kumar Singh , linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, Daniel J Blueman Subject: [PATCH] net: qrtr: resend HELLO on MHI resume Date: Wed, 9 Sep 2026 13:58:44 +0800 Message-ID: <20260909055846.16539-1-daniel@quora.org> X-Mailer: git-send-email 2.53.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Since the MHI HELLO exchange was relocated, it is sent only at device registration. During a suspend-resume cycle, the firmware in WiFi cards such as WCN7850 indefinitely waits for another HELLO, triggering: ath12k_wifi7_pci 0004:01:00.0: timeout while waiting for restart complete ath12k_wifi7_pci 0004:01:00.0: failed to resume core: -110 Fix this by triggering the handshake from resume_early in the MHI transport. Validated on Qualcomm X1E-801800 on Lenovo Slim 7x across 10 suspend-resume cycles. Fixes: 544d85de4dc2 ("net: qrtr: Send HELLO message on endpoint register") Signed-off-by: Daniel J Blueman --- net/qrtr/af_qrtr.c | 13 +++++++++++++ net/qrtr/mhi.c | 10 +++++++++- net/qrtr/qrtr.h | 2 ++ 3 files changed, 24 insertions(+), 1 deletion(-) diff --git a/net/qrtr/af_qrtr.c b/net/qrtr/af_qrtr.c index 78347c937af7..2ffcfc2fdb4a 100644 --- a/net/qrtr/af_qrtr.c +++ b/net/qrtr/af_qrtr.c @@ -623,6 +623,19 @@ static void qrtr_hello_work(struct work_struct *work) qrtr_port_put(ctrl); } +/* Trigger the HELLO handshake after the remote has been reset, eg on resume */ +void qrtr_endpoint_hello(struct qrtr_endpoint *ep) +{ + struct qrtr_node *node = ep->node; + + mutex_lock(&node->ep_lock); + node->hello_sent = false; + mutex_unlock(&node->ep_lock); + + schedule_delayed_work(&node->say_hello, 0); +} +EXPORT_SYMBOL_GPL(qrtr_endpoint_hello); + /** * qrtr_endpoint_register() - register a new endpoint * @ep: endpoint to register diff --git a/net/qrtr/mhi.c b/net/qrtr/mhi.c index 3990da1a65dc..50326ffa3401 100644 --- a/net/qrtr/mhi.c +++ b/net/qrtr/mhi.c @@ -183,6 +183,7 @@ static int __maybe_unused qcom_mhi_qrtr_pm_suspend_late(struct device *dev) static int __maybe_unused qcom_mhi_qrtr_pm_resume_early(struct device *dev) { struct mhi_device *mhi_dev = container_of(dev, struct mhi_device, dev); + struct qrtr_mhi_dev *qdev = dev_get_drvdata(dev); enum mhi_state state; int rc; @@ -201,7 +201,13 @@ static int __maybe_unused qcom_mhi_qrtr_pm_resume_early(struct device *dev) return rc; } - return qcom_mhi_qrtr_queue_dl_buffers(mhi_dev); + rc = qcom_mhi_qrtr_queue_dl_buffers(mhi_dev); + if (rc) + return rc; + + qrtr_endpoint_hello(&qdev->ep); + + return 0; } static const struct dev_pm_ops qcom_mhi_qrtr_pm_ops = { diff --git a/net/qrtr/qrtr.h b/net/qrtr/qrtr.h index 3f2d28696062..de2de69a6199 100644 --- a/net/qrtr/qrtr.h +++ b/net/qrtr/qrtr.h @@ -27,6 +27,8 @@ int qrtr_endpoint_register(struct qrtr_endpoint *ep, unsigned int nid); void qrtr_endpoint_unregister(struct qrtr_endpoint *ep); +void qrtr_endpoint_hello(struct qrtr_endpoint *ep); + int qrtr_endpoint_post(struct qrtr_endpoint *ep, const void *data, size_t len); int qrtr_ns_init(void); -- 2.53.0