[PATCH net 2/2] net: ipa: skip suspend/resume activities if not set up

From: Alex Elder
Date: Tue Oct 06 2020 - 17:31:06 EST


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: 84f9bd12d46d ("soc: qcom: ipa: IPA endpoints")
Tested-by: Matthias Kaehlcke <mka@xxxxxxxxxxxx>
Signed-off-by: Alex Elder <elder@xxxxxxxxxx>
---
drivers/net/ipa/ipa_endpoint.c | 6 ++++++
1 file changed, 6 insertions(+)

diff --git a/drivers/net/ipa/ipa_endpoint.c b/drivers/net/ipa/ipa_endpoint.c
index b7efd7c95e9c8..ed60fa5bcdaca 100644
--- a/drivers/net/ipa/ipa_endpoint.c
+++ b/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]);

--
2.20.1