linux-kernel - [PATCH 1/2] scsi: ufs: Tidy clocks list head usage

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Date:   Mon,  5 Jun 2017 11:36:54 +0300
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Vinayak Holikatti <vinholikatti@...il.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        "James E.J. Bottomley" <jejb@...ux.vnet.ibm.com>
Cc:     linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
        Szymon Mielczarek <szymonx.mielczarek@...el.com>,
        Michal Potomski <michalx.potomski@...el.com>,
        Grzegorz Janca <grzegorz.janca@...el.com>
Subject: [PATCH 1/2] scsi: ufs: Tidy clocks list head usage

From: Szymon Mielczarek <szymonx.mielczarek@...el.com>

Move the initialization of clocks list head to ufshcd_alloc_host() so that
every driver doesn't have to do it. Remove checks for the list head being
NULL because that is not possible.

Signed-off-by: Szymon Mielczarek <szymonx.mielczarek@...el.com>
Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
---
 drivers/scsi/ufs/tc-dwc-g210-pci.c |  2 --
 drivers/scsi/ufs/ufshcd-pci.c      |  2 --
 drivers/scsi/ufs/ufshcd-pltfrm.c   |  2 --
 drivers/scsi/ufs/ufshcd.c          | 12 +++++++-----
 4 files changed, 7 insertions(+), 11 deletions(-)

diff --git a/drivers/scsi/ufs/tc-dwc-g210-pci.c b/drivers/scsi/ufs/tc-dwc-g210-pci.c
index c09a0fef0fe6..325d5e14fc0d 100644
--- a/drivers/scsi/ufs/tc-dwc-g210-pci.c
+++ b/drivers/scsi/ufs/tc-dwc-g210-pci.c
@@ -130,8 +130,6 @@ static void tc_dwc_g210_pci_remove(struct pci_dev *pdev)
 		return err;
 	}
 
-	INIT_LIST_HEAD(&hba->clk_list_head);
-
 	hba->vops = &tc_dwc_g210_pci_hba_vops;
 
 	err = ufshcd_init(hba, mmio_base, pdev->irq);
diff --git a/drivers/scsi/ufs/ufshcd-pci.c b/drivers/scsi/ufs/ufshcd-pci.c
index 52b546fb509b..5dd4122cbd85 100644
--- a/drivers/scsi/ufs/ufshcd-pci.c
+++ b/drivers/scsi/ufs/ufshcd-pci.c
@@ -143,8 +143,6 @@ static void ufshcd_pci_remove(struct pci_dev *pdev)
 		return err;
 	}
 
-	INIT_LIST_HEAD(&hba->clk_list_head);
-
 	err = ufshcd_init(hba, mmio_base, pdev->irq);
 	if (err) {
 		dev_err(&pdev->dev, "Initialization failed\n");
diff --git a/drivers/scsi/ufs/ufshcd-pltfrm.c b/drivers/scsi/ufs/ufshcd-pltfrm.c
index 8e5e6c04c035..e82bde077296 100644
--- a/drivers/scsi/ufs/ufshcd-pltfrm.c
+++ b/drivers/scsi/ufs/ufshcd-pltfrm.c
@@ -58,8 +58,6 @@ static int ufshcd_parse_clock_info(struct ufs_hba *hba)
 	if (!np)
 		goto out;
 
-	INIT_LIST_HEAD(&hba->clk_list_head);
-
 	cnt = of_property_count_strings(np, "clock-names");
 	if (!cnt || (cnt == -EINVAL)) {
 		dev_info(dev, "%s: Unable to find clocks, assuming enabled\n",
diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index ffe8d8608818..88ccd63f83c1 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -314,7 +314,7 @@ static void ufshcd_print_clk_freqs(struct ufs_hba *hba)
 	struct ufs_clk_info *clki;
 	struct list_head *head = &hba->clk_list_head;
 
-	if (!head || list_empty(head))
+	if (list_empty(head))
 		return;
 
 	list_for_each_entry(clki, head, list) {
@@ -869,7 +869,7 @@ static int ufshcd_scale_clks(struct ufs_hba *hba, bool scale_up)
 	ktime_t start = ktime_get();
 	bool clk_state_changed = false;
 
-	if (!head || list_empty(head))
+	if (list_empty(head))
 		goto out;
 
 	ret = ufshcd_vops_clk_scale_notify(hba, scale_up, PRE_CHANGE);
@@ -943,7 +943,7 @@ static bool ufshcd_is_devfreq_scaling_required(struct ufs_hba *hba,
 	struct ufs_clk_info *clki;
 	struct list_head *head = &hba->clk_list_head;
 
-	if (!head || list_empty(head))
+	if (list_empty(head))
 		return false;
 
 	list_for_each_entry(clki, head, list) {
@@ -6752,7 +6752,7 @@ static int __ufshcd_setup_clocks(struct ufs_hba *hba, bool on,
 	ktime_t start = ktime_get();
 	bool clk_state_changed = false;
 
-	if (!head || list_empty(head))
+	if (list_empty(head))
 		goto out;
 
 	ret = ufshcd_vops_setup_clocks(hba, on, PRE_CHANGE);
@@ -6818,7 +6818,7 @@ static int ufshcd_init_clocks(struct ufs_hba *hba)
 	struct device *dev = hba->dev;
 	struct list_head *head = &hba->clk_list_head;
 
-	if (!head || list_empty(head))
+	if (list_empty(head))
 		goto out;
 
 	list_for_each_entry(clki, head, list) {
@@ -7811,6 +7811,8 @@ int ufshcd_alloc_host(struct device *dev, struct ufs_hba **hba_handle)
 	hba->dev = dev;
 	*hba_handle = hba;
 
+	INIT_LIST_HEAD(&hba->clk_list_head);
+
 out_error:
 	return err;
 }
-- 
1.9.1