Commit 6a5719cc3ef2 for kernel

commit 6a5719cc3ef2e4d9857cc4ae18e6db09d59a8cc9
Author: Daniel J Blueman <daniel@quora.org>
Date:   Sun Sep 20 16:16:08 2026 +0200

    net: qrtr: resend HELLO on MHI resume

    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 <daniel@quora.org>
    Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@oss.qualcomm.com>
    Reported-by: Jeff Johnson <jeff.johnson@oss.qualcomm.com>
    Link: https://lore.kernel.org/all/6257c447-788d-4362-851e-0d552bcf7c56@oss.qualcomm.com/
    Tested-by: Jeff Johnson <jeff.johnson@oss.qualcomm.com>
    Reported-by: Vlastimil Babka (SUSE) <vbabka@suse.com>
    Link: https://lore.kernel.org/all/ab1491bb-cca5-4145-ac7d-31c966abf7b4@suse.com/
    Tested-by: Vlastimil Babka (SUSE) <vbabka@kernel.org>
    Reported-by: Takashi Iwai <tiwai@suse.de>
    Link: https://lore.kernel.org/all/87a4plsg4w.wl-tiwai@suse.de/
    Tested-by: Takashi Iwai <tiwai@suse.de>
    Signed-off-by: Thorsten Leemhuis <linux@leemhuis.info>
    Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/net/qrtr/af_qrtr.c b/net/qrtr/af_qrtr.c
index 78347c937af7..e7b3647424b8 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..e9a4bb92ce76 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 +202,13 @@ 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);