qtnfmac: improve control path timeout handling

Control path will not be operational after firmware failure. Change bus
state to QTNF_FW_STATE_EP_DEAD after the control path timeout.
Don't wait for timeout if control path is already dead.

Signed-off-by: Dmitry Lebed <dlebed@quantenna.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/quantenna/qtnfmac/bus.h

@@ -27,7 +27,8 @@ enum qtnf_fw_state {
 	QTNF_FW_STATE_FW_DNLD_DONE,
 	QTNF_FW_STATE_BOOT_DONE,
 	QTNF_FW_STATE_ACTIVE,
-	QTNF_FW_STATE_DEAD,
+	QTNF_FW_STATE_DETACHED,
+	QTNF_FW_STATE_EP_DEAD,
 };
 
 struct qtnf_bus;

drivers/net/wireless/quantenna/qtnfmac/core.c

@@ -628,7 +628,7 @@ void qtnf_core_detach(struct qtnf_bus *bus)
 	if (bus->fw_state == QTNF_FW_STATE_ACTIVE)
 		qtnf_cmd_send_deinit_fw(bus);
 
-	bus->fw_state = QTNF_FW_STATE_DEAD;
+	bus->fw_state = QTNF_FW_STATE_DETACHED;
 
 	if (bus->workqueue) {
 		flush_workqueue(bus->workqueue);

drivers/net/wireless/quantenna/qtnfmac/pearl/pcie.c

@@ -751,8 +751,16 @@ tx_done:
 static int qtnf_pcie_control_tx(struct qtnf_bus *bus, struct sk_buff *skb)
 {
 	struct qtnf_pcie_bus_priv *priv = (void *)get_bus_priv(bus);
+	int ret;
+
+	ret = qtnf_shm_ipc_send(&priv->shm_ipc_ep_in, skb->data, skb->len);
 
-	return qtnf_shm_ipc_send(&priv->shm_ipc_ep_in, skb->data, skb->len);
+	if (ret == -ETIMEDOUT) {
+		pr_err("EP firmware is dead\n");
+		bus->fw_state = QTNF_FW_STATE_EP_DEAD;
+	}
+
+	return ret;
 }
 
 static irqreturn_t qtnf_interrupt(int irq, void *data)
@@ -1238,7 +1246,7 @@ static void qtnf_fw_work_handler(struct work_struct *work)
 	goto fw_load_exit;
 
 fw_load_fail:
-	bus->fw_state = QTNF_FW_STATE_DEAD;
+	bus->fw_state = QTNF_FW_STATE_DETACHED;
 
 fw_load_exit:
 	complete(&bus->firmware_init_complete);
@@ -1408,7 +1416,8 @@ static void qtnf_pcie_remove(struct pci_dev *pdev)
 
 	wait_for_completion(&bus->firmware_init_complete);
 
-	if (bus->fw_state == QTNF_FW_STATE_ACTIVE)
+	if (bus->fw_state == QTNF_FW_STATE_ACTIVE ||
+	    bus->fw_state == QTNF_FW_STATE_EP_DEAD)
 		qtnf_core_detach(bus);
 
 	priv = get_bus_priv(bus);