cnss2: get msi_data again after request_irq is called

The reservation mode of interrupts in kernel assigns a dummy vector
when the interrupt is allocated and assigns a real vector when the
request_irq is called. The reservation mode helps to ease vector
pressure when devices with a large amount of queues/interrupts
are initialized, but only a minimal subset of those queues/interrupts
is actually used.
So on reservation mode, the msi_data may change after request_irq
is called, so reads msi_data again after mhi request_irq is called,
and then the correct msi_data is programmed into hardware components.
Without this change, spurious interrupt occurs in case of one MSI
vector.

Change-Id: I41070987798835f8fa95304fce3b964bbd77b31d
CRs-Fixed: 3313984

cnss2/pci.c

@@ -1870,6 +1870,23 @@ out:
 	return ret;
 }
 
+static int cnss_pci_config_msi_data(struct cnss_pci_data *pci_priv)
+{
+	struct msi_desc *msi_desc;
+	struct pci_dev *pci_dev = pci_priv->pci_dev;
+
+	msi_desc = irq_get_msi_desc(pci_dev->irq);
+	if (!msi_desc) {
+		cnss_pr_err("msi_desc is NULL!\n");
+		return -EINVAL;
+	}
+
+	pci_priv->msi_ep_base_data = msi_desc->msg.data;
+	cnss_pr_dbg("MSI base data is %d\n", pci_priv->msi_ep_base_data);
+
+	return 0;
+}
+
 int cnss_pci_start_mhi(struct cnss_pci_data *pci_priv)
 {
 	int ret = 0;
@@ -1920,6 +1937,14 @@ int cnss_pci_start_mhi(struct cnss_pci_data *pci_priv)
 		 */
 		set_bit(CNSS_MHI_POWER_ON, &pci_priv->mhi_state);
 		ret = cnss_pci_handle_mhi_poweron_timeout(pci_priv);
+	} else if (!ret) {
+		/* kernel may allocate a dummy vector before request_irq and
+		 * then allocate a real vector when request_irq is called.
+		 * So get msi_data here again to avoid spurious interrupt
+		 * as msi_data will configured to srngs.
+		 */
+		if (cnss_pci_is_one_msi(pci_priv))
+			ret = cnss_pci_config_msi_data(pci_priv);
 	}
 
 	return ret;
@@ -4424,7 +4449,6 @@ static int cnss_pci_enable_msi(struct cnss_pci_data *pci_priv)
 	struct pci_dev *pci_dev = pci_priv->pci_dev;
 	int num_vectors;
 	struct cnss_msi_config *msi_config;
-	struct msi_desc *msi_desc;
 
 	if (pci_priv->device_id == QCA6174_DEVICE_ID)
 		return 0;
@@ -4460,16 +4484,11 @@ static int cnss_pci_enable_msi(struct cnss_pci_data *pci_priv)
 		goto reset_msi_config;
 	}
 
-	msi_desc = irq_get_msi_desc(pci_dev->irq);
-	if (!msi_desc) {
-		cnss_pr_err("msi_desc is NULL!\n");
+	if (cnss_pci_config_msi_data(pci_priv)) {
 		ret = -EINVAL;
 		goto free_msi_vector;
 	}
 
-	pci_priv->msi_ep_base_data = msi_desc->msg.data;
-	cnss_pr_dbg("MSI base data is %d\n", pci_priv->msi_ep_base_data);
-
 	return 0;
 
 free_msi_vector: