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Subject[PATCH 4.14 077/186] scsi: ufs: Fix race conditions related to driver data
Date
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


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