net: ipa: skip suspend/resume activities if not set up

[ Upstream commit d170438 ]

When processing a system suspend request we suspend modem endpoints
if they are enabled, and call ipa_cmd_tag_process() (which issues
IPA commands) to ensure the IPA pipeline is cleared.  It is an error
to attempt to issue an IPA command before setup is complete, so this
is clearly a bug.  But we also shouldn't suspend or resume any
endpoints that have not been set up.

Have ipa_endpoint_suspend() and ipa_endpoint_resume() immediately
return if setup hasn't completed, to avoid any attempt to configure
endpoints or issue IPA commands in that case.

Fixes: 84f9bd1 ("soc: qcom: ipa: IPA endpoints")
Tested-by: Matthias Kaehlcke <mka@chromium.org>
Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Author: Alex Elder

drivers/net/ipa/ipa_endpoint.c

@@ -1471,6 +1471,9 @@ void ipa_endpoint_resume_one(struct ipa_endpoint *endpoint)
 
 void ipa_endpoint_suspend(struct ipa *ipa)
 {
+	if (!ipa->setup_complete)
+		return;
+
 	if (ipa->modem_netdev)
 		ipa_modem_suspend(ipa->modem_netdev);
 
@@ -1482,6 +1485,9 @@ void ipa_endpoint_suspend(struct ipa *ipa)
 
 void ipa_endpoint_resume(struct ipa *ipa)
 {
+	if (!ipa->setup_complete)
+		return;
+
 	ipa_endpoint_resume_one(ipa->name_map[IPA_ENDPOINT_AP_COMMAND_TX]);
 	ipa_endpoint_resume_one(ipa->name_map[IPA_ENDPOINT_AP_LAN_RX]);