[PATCH 4/5] scsi: ufs: pltfrm: Drop PM runtime reference count after ufshcd_remove()

[Manivannan Sadhasivam via B4 Relay <devnull+manivannan.sadhasivam.linaro.org@xxxxxxxxxx>]

From: Manivannan Sadhasivam <manivannan.sadhasivam@xxxxxxxxxx>

During the remove stage of glue drivers, some of them are incrementing the
reference count using pm_runtime_get_sync(), before removing the ufshcd
using ufshcd_remove(). But they are not dropping that reference count after
ufshcd_remove() to balance the refcount.

So drop the reference count by calling pm_runtime_put_noidle() after
ufshcd_remove(). Since the behavior is applicable to all glue drivers, move
the PM handling to ufshcd_pltfrm_remove().

Cc: stable@xxxxxxxxxxxxxxx # 3.12
Fixes: 62694735ca95 ("[SCSI] ufs: Add runtime PM support for UFS host controller driver")
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@xxxxxxxxxx>
---
 drivers/ufs/host/tc-dwc-g210-pltfrm.c | 1 -
 drivers/ufs/host/ufs-exynos.c         | 1 -
 drivers/ufs/host/ufs-mediatek.c       | 1 -
 drivers/ufs/host/ufs-qcom.c           | 1 -
 drivers/ufs/host/ufs-sprd.c           | 1 -
 drivers/ufs/host/ufshcd-pltfrm.c      | 2 ++
 6 files changed, 2 insertions(+), 5 deletions(-)

diff --git a/drivers/ufs/host/tc-dwc-g210-pltfrm.c b/drivers/ufs/host/tc-dwc-g210-pltfrm.c
index 113e0ef7b2cf..c6f8565ede21 100644
--- a/drivers/ufs/host/tc-dwc-g210-pltfrm.c
+++ b/drivers/ufs/host/tc-dwc-g210-pltfrm.c
@@ -76,7 +76,6 @@ static int tc_dwc_g210_pltfm_probe(struct platform_device *pdev)
  */
 static void tc_dwc_g210_pltfm_remove(struct platform_device *pdev)
 {
-	pm_runtime_get_sync(&(pdev)->dev);
 	ufshcd_pltfrm_remove(pdev);
 }
 
diff --git a/drivers/ufs/host/ufs-exynos.c b/drivers/ufs/host/ufs-exynos.c
index 953103b69e2c..6dedcc8b22b4 100644
--- a/drivers/ufs/host/ufs-exynos.c
+++ b/drivers/ufs/host/ufs-exynos.c
@@ -1960,7 +1960,6 @@ static void exynos_ufs_remove(struct platform_device *pdev)
 	struct ufs_hba *hba =  platform_get_drvdata(pdev);
 	struct exynos_ufs *ufs = ufshcd_get_variant(hba);
 
-	pm_runtime_get_sync(&(pdev)->dev);
 	ufshcd_pltfrm_remove(pdev);
 
 	phy_power_off(ufs->phy);
diff --git a/drivers/ufs/host/ufs-mediatek.c b/drivers/ufs/host/ufs-mediatek.c
index 512b4e43787c..c834d38921b6 100644
--- a/drivers/ufs/host/ufs-mediatek.c
+++ b/drivers/ufs/host/ufs-mediatek.c
@@ -1869,7 +1869,6 @@ static int ufs_mtk_probe(struct platform_device *pdev)
  */
 static void ufs_mtk_remove(struct platform_device *pdev)
 {
-	pm_runtime_get_sync(&(pdev)->dev);
 	ufshcd_pltfrm_remove(pdev);
 }
 
diff --git a/drivers/ufs/host/ufs-qcom.c b/drivers/ufs/host/ufs-qcom.c
index 38732dd48331..91127fb17186 100644
--- a/drivers/ufs/host/ufs-qcom.c
+++ b/drivers/ufs/host/ufs-qcom.c
@@ -1845,7 +1845,6 @@ static void ufs_qcom_remove(struct platform_device *pdev)
 	struct ufs_hba *hba =  platform_get_drvdata(pdev);
 	struct ufs_qcom_host *host = ufshcd_get_variant(hba);
 
-	pm_runtime_get_sync(&(pdev)->dev);
 	ufshcd_pltfrm_remove(pdev);
 	if (host->esi_enabled)
 		platform_device_msi_free_irqs_all(hba->dev);
diff --git a/drivers/ufs/host/ufs-sprd.c b/drivers/ufs/host/ufs-sprd.c
index e455890cf7d4..d220978c2d8c 100644
--- a/drivers/ufs/host/ufs-sprd.c
+++ b/drivers/ufs/host/ufs-sprd.c
@@ -427,7 +427,6 @@ static int ufs_sprd_probe(struct platform_device *pdev)
 
 static void ufs_sprd_remove(struct platform_device *pdev)
 {
-	pm_runtime_get_sync(&(pdev)->dev);
 	ufshcd_pltfrm_remove(pdev);
 }
 
diff --git a/drivers/ufs/host/ufshcd-pltfrm.c b/drivers/ufs/host/ufshcd-pltfrm.c
index bad5b1303eb6..b8dadd0a2f4c 100644
--- a/drivers/ufs/host/ufshcd-pltfrm.c
+++ b/drivers/ufs/host/ufshcd-pltfrm.c
@@ -532,8 +532,10 @@ void ufshcd_pltfrm_remove(struct platform_device *pdev)
 {
 	struct ufs_hba *hba =  platform_get_drvdata(pdev);
 
+	pm_runtime_get_sync(&pdev->dev);
 	ufshcd_remove(hba);
 	pm_runtime_disable(&pdev->dev);
+	pm_runtime_put_noidle(&pdev->dev);
 }
 EXPORT_SYMBOL_GPL(ufshcd_pltfrm_remove);
 

-- 
2.25.1