linux-kernel - [PATCH v3 1/1] i2c: qcom-cci: Fix ordering of pm_runtime_xx and i2c_add

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Message-Id: <20221018021920.3747344-2-bryan.odonoghue@linaro.org>
Date:   Tue, 18 Oct 2022 03:19:20 +0100
From:   Bryan O'Donoghue <bryan.odonoghue@...aro.org>
To:     loic.poulain@...aro.org, robert.foss@...aro.org, wsa@...nel.org,
        linux-i2c@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     vladimir.zapolskiy@...aro.org, bryan.odonoghue@...aro.org,
        stable@...r.kernel.org
Subject: [PATCH v3 1/1] i2c: qcom-cci: Fix ordering of pm_runtime_xx and i2c_add_adapter

When we compile-in the CCI along with the imx412 driver and run on the RB5
we see that i2c_add_adapter() causes the probe of the imx412 driver to
happen.

This probe tries to perform an i2c xfer() and the xfer() in i2c-qcom-cci.c
fails on pm_runtime_get() because the i2c-qcom-cci.c::probe() function has
not completed to pm_runtime_enable(dev).

Fix this sequence by ensuring pm_runtime_xxx() calls happen prior to adding
the i2c adapter.

Fixes: e517526195de ("i2c: Add Qualcomm CCI I2C driver")
Reported-by: Vladimir Zapolskiy <vladimir.zapolskiy@...aro.org>
Reviewed-by: Vladimir Zapolskiy <vladimir.zapolskiy@...aro.org>
Tested-by: Vladimir Zapolskiy <vladimir.zapolskiy@...aro.org>
Cc: <stable@...r.kernel.org>
Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
---
 drivers/i2c/busses/i2c-qcom-cci.c | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/drivers/i2c/busses/i2c-qcom-cci.c b/drivers/i2c/busses/i2c-qcom-cci.c
index 87739fb4388b..a4b97fe3c3a5 100644
--- a/drivers/i2c/busses/i2c-qcom-cci.c
+++ b/drivers/i2c/busses/i2c-qcom-cci.c
@@ -639,6 +639,11 @@ static int cci_probe(struct platform_device *pdev)
 	if (ret < 0)
 		goto error;
 
+	pm_runtime_set_autosuspend_delay(dev, MSEC_PER_SEC);
+	pm_runtime_use_autosuspend(dev);
+	pm_runtime_set_active(dev);
+	pm_runtime_enable(dev);
+
 	for (i = 0; i < cci->data->num_masters; i++) {
 		if (!cci->master[i].cci)
 			continue;
@@ -650,14 +655,12 @@ static int cci_probe(struct platform_device *pdev)
 		}
 	}
 
-	pm_runtime_set_autosuspend_delay(dev, MSEC_PER_SEC);
-	pm_runtime_use_autosuspend(dev);
-	pm_runtime_set_active(dev);
-	pm_runtime_enable(dev);
-
 	return 0;
 
 error_i2c:
+	pm_runtime_disable(dev);
+	pm_runtime_dont_use_autosuspend(dev);
+
 	for (--i ; i >= 0; i--) {
 		if (cci->master[i].cci) {
 			i2c_del_adapter(&cci->master[i].adap);
-- 
2.34.1