linux-kernel - [PATCH] scsi: ufs: ti-j721e-ufs: Fix unwinding of pm

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Message-ID: <20200526100340.15032-1-vigneshr@ti.com>
Date:   Tue, 26 May 2020 15:33:40 +0530
From:   Vignesh Raghavendra <vigneshr@...com>
To:     <jejb@...ux.ibm.com>, <martin.petersen@...cle.com>
CC:     Alim Akhtar <alim.akhtar@...sung.com>,
        Avri Altman <avri.altman@....com>,
        Vignesh Raghavendra <vigneshr@...com>,
        <linux-scsi@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Dinghao Liu <dinghao.liu@....edu.cn>
Subject: [PATCH] scsi: ufs: ti-j721e-ufs: Fix unwinding of pm_runtime changes

Fix unwinding of pm_runtime changes when bailing out of driver probe due
to a failure and also on removal of driver.

Fixes: 6979e56cec97 ("scsi: ufs: Add driver for TI wrapper for Cadence UFS IP")
Reported-by: Dinghao Liu <dinghao.liu@....edu.cn>
Signed-off-by: Vignesh Raghavendra <vigneshr@...com>
---
 drivers/scsi/ufs/ti-j721e-ufs.c | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/drivers/scsi/ufs/ti-j721e-ufs.c b/drivers/scsi/ufs/ti-j721e-ufs.c
index 5216d228cdd9..46bb905b4d6a 100644
--- a/drivers/scsi/ufs/ti-j721e-ufs.c
+++ b/drivers/scsi/ufs/ti-j721e-ufs.c
@@ -32,14 +32,14 @@ static int ti_j721e_ufs_probe(struct platform_device *pdev)
 	ret = pm_runtime_get_sync(dev);
 	if (ret < 0) {
 		pm_runtime_put_noidle(dev);
-		return ret;
+		goto disable_pm;
 	}
 
 	/* Select MPHY refclk frequency */
 	clk = devm_clk_get(dev, NULL);
 	if (IS_ERR(clk)) {
 		dev_err(dev, "Cannot claim MPHY clock.\n");
-		return PTR_ERR(clk);
+		goto clk_err;
 	}
 	clk_rate = clk_get_rate(clk);
 	if (clk_rate == 26000000)
@@ -54,16 +54,23 @@ static int ti_j721e_ufs_probe(struct platform_device *pdev)
 				   dev);
 	if (ret) {
 		dev_err(dev, "failed to populate child nodes %d\n", ret);
-		pm_runtime_put_sync(dev);
+		goto clk_err;
 	}
 
 	return ret;
+
+clk_err:
+	pm_runtime_put_sync(dev);
+disable_pm:
+	pm_runtime_disable(dev);
+	return ret;
 }
 
 static int ti_j721e_ufs_remove(struct platform_device *pdev)
 {
 	of_platform_depopulate(&pdev->dev);
 	pm_runtime_put_sync(&pdev->dev);
+	pm_runtime_disable(&pdev->dev);
 
 	return 0;
 }
-- 
2.26.2