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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Alexey Dobriyan <adobriyan@gmail.com>,
        Bean Huo <beanhuo@micron.com>,
        Bart Van Assche <bvanassche@acm.org>,
        "Martin K. Petersen" <martin.petersen@oracle.com>,
        Sasha Levin <sashal@kernel.org>
Subject: [PATCH 4.14 077/186] scsi: ufs: Fix race conditions related to driver data
Date:   Mon, 24 Jan 2022 19:42:32 +0100
Message-Id: <20220124183939.599917695@linuxfoundation.org>
In-Reply-To: <20220124183937.101330125@linuxfoundation.org>
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From: Bart Van Assche <bvanassche@acm.org>

[ Upstream commit 21ad0e49085deb22c094f91f9da57319a97188e4 ]

The driver data pointer must be set before any callbacks are registered
that use that pointer. Hence move the initialization of that pointer from
after the ufshcd_init() call to inside ufshcd_init().

Link: https://lore.kernel.org/r/20211203231950.193369-7-bvanassche@acm.org
Fixes: 3b1d05807a9a ("[SCSI] ufs: Segregate PCI Specific Code")
Reported-by: Alexey Dobriyan <adobriyan@gmail.com>
Tested-by: Bean Huo <beanhuo@micron.com>
Reviewed-by: Bean Huo <beanhuo@micron.com>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/scsi/ufs/tc-dwc-g210-pci.c | 1 -
 drivers/scsi/ufs/ufshcd-pltfrm.c   | 2 --
 drivers/scsi/ufs/ufshcd.c          | 7 +++++++
 3 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/scsi/ufs/tc-dwc-g210-pci.c b/drivers/scsi/ufs/tc-dwc-g210-pci.c
index 325d5e14fc0d8..a8b50fc1960d1 100644
--- a/drivers/scsi/ufs/tc-dwc-g210-pci.c
+++ b/drivers/scsi/ufs/tc-dwc-g210-pci.c
@@ -138,7 +138,6 @@ tc_dwc_g210_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 		return err;
 	}
 
-	pci_set_drvdata(pdev, hba);
 	pm_runtime_put_noidle(&pdev->dev);
 	pm_runtime_allow(&pdev->dev);
 
diff --git a/drivers/scsi/ufs/ufshcd-pltfrm.c b/drivers/scsi/ufs/ufshcd-pltfrm.c
index 8992354d4e2c7..6f076ff35dd38 100644
--- a/drivers/scsi/ufs/ufshcd-pltfrm.c
+++ b/drivers/scsi/ufs/ufshcd-pltfrm.c
@@ -348,8 +348,6 @@ int ufshcd_pltfrm_init(struct platform_device *pdev,
 		goto dealloc_host;
 	}
 
-	platform_set_drvdata(pdev, hba);
-
 	pm_runtime_set_active(&pdev->dev);
 	pm_runtime_enable(&pdev->dev);
 
diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index f46fa8a2f6585..694c0fc31fbf7 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -7904,6 +7904,13 @@ int ufshcd_init(struct ufs_hba *hba, void __iomem *mmio_base, unsigned int irq)
 	struct Scsi_Host *host = hba->host;
 	struct device *dev = hba->dev;
 
+	/*
+	 * dev_set_drvdata() must be called before any callbacks are registered
+	 * that use dev_get_drvdata() (frequency scaling, clock scaling, hwmon,
+	 * sysfs).
+	 */
+	dev_set_drvdata(dev, hba);
+
 	if (!mmio_base) {
 		dev_err(hba->dev,
 		"Invalid memory reference for mmio_base is NULL\n");
-- 
2.34.1