ipa: napi_schedule only after subsys_init

In case napi_schedule() called before the net_dev_init(),
which is called sometime in the subsys_initcall,
the napi_schedule() call will cause null pointer dereference.

This change sets dependency on passing the subsys_init for
the napi_schedule() calls.

Change-Id: I5688a845d98d8939e0d5df7efb8e1d293b19a37e
Signed-off-by: Ilia Lin <[email protected]>

drivers/platform/msm/ipa/ipa_v3/ipa_dp.c

@@ -1934,7 +1934,7 @@ static void ipa3_wq_handle_rx(struct work_struct *work)
 
 	sys = container_of(work, struct ipa3_sys_context, work);
 
-	if (sys->napi_obj) {
+	if (ipa_net_initialized && sys->napi_obj) {
 		ipa_pm_activate_sync(sys->pm_hdl);
 		napi_schedule(sys->napi_obj);
 	} else if (IPA_CLIENT_IS_LOW_LAT_CONS(sys->ep->client)) {
@@ -4563,7 +4563,7 @@ static void ipa_gsi_irq_tx_notify_cb(struct gsi_chan_xfer_notify *notify)
 		tx_pkt->xmit_done = true;
 		atomic_inc(&tx_pkt->sys->xmit_eot_cnt);
 
-		if (ipa3_ctx->tx_napi_enable) {
+		if (ipa_net_initialized && ipa3_ctx->tx_napi_enable) {
 		    if(!atomic_cmpxchg(&tx_pkt->sys->in_napi_context, 0, 1))
 			napi_schedule(&tx_pkt->sys->napi_tx);
 		}
@@ -4589,7 +4589,7 @@ void __ipa_gsi_irq_rx_scedule_poll(struct ipa3_sys_context *sys)
 	 * or after NAPI poll
 	 */
 	clk_off = ipa_pm_activate(sys->pm_hdl);
-	if (!clk_off && sys->napi_obj)
+	if (!clk_off && ipa_net_initialized && sys->napi_obj)
 		napi_schedule(sys->napi_obj);
 	else if (!clk_off &&
 		IPA_CLIENT_IS_LOW_LAT_CONS(sys->ep->client)) {

drivers/platform/msm/ipa/ipa_v3/ipa_i.h

@@ -2436,6 +2436,7 @@ struct ipa3_controller {
 };
 
 extern struct ipa3_context *ipa3_ctx;
+extern bool ipa_net_initialized;
 
 /* public APIs */
 /* Generic GSI channels functions */

drivers/platform/msm/ipa/ipa_v3/ipa_net.c

@@ -22,10 +22,15 @@
 #include "ipa_i.h"
 #include "ipa_qmi_service.h"
 
+bool ipa_net_initialized = false;
+
 static int __init ipa_late_init(void)
 {
 	int rc = 0;
 
+	/* We are here, thus the subsys_initcall is finished */
+	ipa_net_initialized = true;
+
 	IPADBG("IPA late init\n");
 
 	rc = ipa3_wwan_platform_driver_register();