linux-kernel - [PATCH v1 2/4] scsi: ufshcd: release resources if probe fails

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Message-Id: <1477614358-5444-1-git-send-email-subhashj@codeaurora.org>
Date:   Thu, 27 Oct 2016 17:25:58 -0700
From:   Subhash Jadavani <subhashj@...eaurora.org>
To:     vinholikatti@...il.com, jejb@...ux.vnet.ibm.com,
        martin.petersen@...cle.com
Cc:     Subhash Jadavani <subhashj@...eaurora.org>,
        linux-scsi@...r.kernel.org (open list:UNIVERSAL FLASH STORAGE HOST
        CONTROLLER DRIVER), linux-kernel@...r.kernel.org (open list)
Subject: [PATCH v1 2/4] scsi: ufshcd: release resources if probe fails

If ufshcd pltfrm/pci driver's probe fails for some reason then ensure that
scsi host is released to avoid memory leak but managed memory allocations
(via devm_* calls) need not to be freed explicitly on probe failure as
memory allocated with these functions is automatically freed on driver
detach.

Reviewed-by: Sahitya Tummala <stummala@...eaurora.org>
Signed-off-by: Subhash Jadavani <subhashj@...eaurora.org>
---
 drivers/scsi/ufs/ufshcd-pci.c    | 2 ++
 drivers/scsi/ufs/ufshcd-pltfrm.c | 5 +----
 drivers/scsi/ufs/ufshcd.c        | 3 ---
 3 files changed, 3 insertions(+), 7 deletions(-)

diff --git a/drivers/scsi/ufs/ufshcd-pci.c b/drivers/scsi/ufs/ufshcd-pci.c
index d15eaa4..52b546f 100644
--- a/drivers/scsi/ufs/ufshcd-pci.c
+++ b/drivers/scsi/ufs/ufshcd-pci.c
@@ -104,6 +104,7 @@ static void ufshcd_pci_remove(struct pci_dev *pdev)
 	pm_runtime_forbid(&pdev->dev);
 	pm_runtime_get_noresume(&pdev->dev);
 	ufshcd_remove(hba);
+	ufshcd_dealloc_host(hba);
 }
 
 /**
@@ -147,6 +148,7 @@ static void ufshcd_pci_remove(struct pci_dev *pdev)
 	err = ufshcd_init(hba, mmio_base, pdev->irq);
 	if (err) {
 		dev_err(&pdev->dev, "Initialization failed\n");
+		ufshcd_dealloc_host(hba);
 		return err;
 	}
 
diff --git a/drivers/scsi/ufs/ufshcd-pltfrm.c b/drivers/scsi/ufs/ufshcd-pltfrm.c
index db53f38..a72a4ba 100644
--- a/drivers/scsi/ufs/ufshcd-pltfrm.c
+++ b/drivers/scsi/ufs/ufshcd-pltfrm.c
@@ -163,7 +163,7 @@ static int ufshcd_populate_vreg(struct device *dev, const char *name,
 	if (ret) {
 		dev_err(dev, "%s: unable to find %s err %d\n",
 				__func__, prop_name, ret);
-		goto out_free;
+		goto out;
 	}
 
 	vreg->min_uA = 0;
@@ -185,9 +185,6 @@ static int ufshcd_populate_vreg(struct device *dev, const char *name,
 
 	goto out;
 
-out_free:
-	devm_kfree(dev, vreg);
-	vreg = NULL;
 out:
 	if (!ret)
 		*out_vreg = vreg;
diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index 5c931d1..6c0082e 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -6253,8 +6253,6 @@ void ufshcd_remove(struct ufs_hba *hba)
 	ufshcd_disable_intr(hba, hba->intr_mask);
 	ufshcd_hba_stop(hba, true);
 
-	scsi_host_put(hba->host);
-
 	ufshcd_exit_clk_gating(hba);
 	if (ufshcd_is_clkscaling_enabled(hba))
 		devfreq_remove_device(hba->devfreq);
@@ -6616,7 +6614,6 @@ int ufshcd_init(struct ufs_hba *hba, void __iomem *mmio_base, unsigned int irq)
 	ufshcd_exit_clk_gating(hba);
 out_disable:
 	hba->is_irq_enabled = false;
-	scsi_host_put(host);
 	ufshcd_hba_exit(hba);
 out_error:
 	return err;
-- 
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