linux-kernel - [RFT PATCH v2 07/10] drivers: qcom: rpmh-rsc: Warning if tcs

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Date:   Wed, 11 Mar 2020 16:13:45 -0700
From:   Douglas Anderson <dianders@...omium.org>
To:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Maulik Shah <mkshah@...eaurora.org>
Cc:     mka@...omium.org, Rajendra Nayak <rnayak@...eaurora.org>,
        evgreen@...omium.org, Lina Iyer <ilina@...eaurora.org>,
        swboyd@...omium.org, Douglas Anderson <dianders@...omium.org>,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [RFT PATCH v2 07/10] drivers: qcom: rpmh-rsc: Warning if tcs_write() used for non-active

tcs_write() is documented to only be useful for writing
RPMH_ACTIVE_ONLY_STATE.  Let's be loud if someone messes up.

Signed-off-by: Douglas Anderson <dianders@...omium.org>
---

Changes in v2: None

 drivers/soc/qcom/rpmh-rsc.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/soc/qcom/rpmh-rsc.c b/drivers/soc/qcom/rpmh-rsc.c
index 93f5d1fb71ca..ba489d18c20e 100644
--- a/drivers/soc/qcom/rpmh-rsc.c
+++ b/drivers/soc/qcom/rpmh-rsc.c
@@ -573,6 +573,12 @@ static int tcs_write(struct rsc_drv *drv, const struct tcs_request *msg)
 	unsigned long flags;
 	int ret;
 
+	/*
+	 * It only makes sense to grab a whole TCS for ourselves if we're
+	 * triggering right away, which we only do for ACTIVE_ONLY.
+	 */
+	WARN_ON(msg->state != RPMH_ACTIVE_ONLY_STATE);
+
 	/* TODO: get_tcs_for_msg() can return -EAGAIN and nobody handles */
 	tcs = get_tcs_for_msg(drv, msg);
 	if (IS_ERR(tcs))
-- 
2.25.1.481.gfbce0eb801-goog