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[73.185.129.58]) by smtp.gmail.com with ESMTPSA id z20sm2043215ior.2.2020.10.06.14.30.57 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 06 Oct 2020 14:30:57 -0700 (PDT) From: Alex Elder To: davem@davemloft.net, kuba@kernel.org Cc: evgreen@chromium.org, subashab@codeaurora.org, cpratapa@codeaurora.org, bjorn.andersson@linaro.org, mka@chromium.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH net 2/2] net: ipa: skip suspend/resume activities if not set up Date: Tue, 6 Oct 2020 16:30:47 -0500 Message-Id: <20201006213047.31308-3-elder@linaro.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20201006213047.31308-1-elder@linaro.org> References: <20201006213047.31308-1-elder@linaro.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 Signed-off-by: Alex Elder --- 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