linux-kernel - [PATCH 5.8 010/633] net: ipa: skip suspend/resume activities if not set up

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Date:   Tue, 27 Oct 2020 14:45:53 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Matthias Kaehlcke <mka@...omium.org>,
        Alex Elder <elder@...aro.org>, Jakub Kicinski <kuba@...nel.org>
Subject: [PATCH 5.8 010/633] net: ipa: skip suspend/resume activities if not set up

From: Alex Elder <elder@...aro.org>

[ Upstream commit d1704382821032fede445b816f4296fd379baacf ]

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@...omium.org>
Signed-off-by: Alex Elder <elder@...aro.org>
Signed-off-by: Jakub Kicinski <kuba@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/ipa/ipa_endpoint.c |    6 ++++++
 1 file changed, 6 insertions(+)

--- a/drivers/net/ipa/ipa_endpoint.c
+++ b/drivers/net/ipa/ipa_endpoint.c
@@ -1447,6 +1447,9 @@ void ipa_endpoint_resume_one(struct ipa_
 
 void ipa_endpoint_suspend(struct ipa *ipa)
 {
+	if (!ipa->setup_complete)
+		return;
+
 	if (ipa->modem_netdev)
 		ipa_modem_suspend(ipa->modem_netdev);
 
@@ -1458,6 +1461,9 @@ void ipa_endpoint_suspend(struct ipa *ip
 
 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]);