[PATCH 0/3] mei: remove unnecessary NULL pointer checks

[PATCH 0/3] mei: remove unnecessary NULL pointer checks

[Bjorn Helgaas]

From: Bjorn Helgaas <bhelgaas@google.com>

After .probe() has returned success, drvdata has been set to a non-NULL
value, so there's no need to check for NULL in other callbacks.

Bjorn Helgaas (3):
  mei: gsc: remove unnecessary NULL pointer checks
  mei: txe: remove unnecessary NULL pointer checks
  mei: me: remove unnecessary NULL pointer checks

 drivers/misc/mei/gsc-me.c  | 17 ----------------
 drivers/misc/mei/pci-me.c  | 38 ++++++------------------------------
 drivers/misc/mei/pci-txe.c | 40 ++++++--------------------------------
 3 files changed, 12 insertions(+), 83 deletions(-)

-- 
2.34.1

[PATCH 1/3] mei: gsc: remove unnecessary NULL pointer checks

[Bjorn Helgaas]

From: Bjorn Helgaas <bhelgaas@google.com>

The .remove() and power management callbacks are never called unless
.probe() has already returned success, which means it has set drvdata to a
non-NULL pointer, so "dev" can never be NULL in the other callbacks.

Remove the unnecessary checks.

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
---
 drivers/misc/mei/gsc-me.c | 17 -----------------
 1 file changed, 17 deletions(-)

diff --git a/drivers/misc/mei/gsc-me.c b/drivers/misc/mei/gsc-me.c
index 6be8f1cc052c..45c10974b12b 100644
--- a/drivers/misc/mei/gsc-me.c
+++ b/drivers/misc/mei/gsc-me.c
@@ -144,9 +144,6 @@ static void mei_gsc_remove(struct auxiliary_device *aux_dev)
 	struct mei_me_hw *hw;
 
 	dev = dev_get_drvdata(&aux_dev->dev);
-	if (!dev)
-		return;
-
 	hw = to_me_hw(dev);
 
 	mei_stop(dev);
@@ -168,9 +165,6 @@ static int __maybe_unused mei_gsc_pm_suspend(struct device *device)
 {
 	struct mei_device *dev = dev_get_drvdata(device);
 
-	if (!dev)
-		return -ENODEV;
-
 	mei_stop(dev);
 
 	mei_disable_interrupts(dev);
@@ -186,9 +180,6 @@ static int __maybe_unused mei_gsc_pm_resume(struct device *device)
 	int err;
 	struct mei_me_hw *hw;
 
-	if (!dev)
-		return -ENODEV;
-
 	hw = to_me_hw(dev);
 	aux_dev = to_auxiliary_dev(device);
 	adev = auxiliary_dev_to_mei_aux_dev(aux_dev);
@@ -211,8 +202,6 @@ static int __maybe_unused mei_gsc_pm_runtime_idle(struct device *device)
 {
 	struct mei_device *dev = dev_get_drvdata(device);
 
-	if (!dev)
-		return -ENODEV;
 	if (mei_write_is_idle(dev))
 		pm_runtime_autosuspend(device);
 
@@ -225,9 +214,6 @@ static int  __maybe_unused mei_gsc_pm_runtime_suspend(struct device *device)
 	struct mei_me_hw *hw;
 	int ret;
 
-	if (!dev)
-		return -ENODEV;
-
 	mutex_lock(&dev->device_lock);
 
 	if (mei_write_is_idle(dev)) {
@@ -252,9 +238,6 @@ static int __maybe_unused mei_gsc_pm_runtime_resume(struct device *device)
 	struct mei_me_hw *hw;
 	irqreturn_t irq_ret;
 
-	if (!dev)
-		return -ENODEV;
-
 	mutex_lock(&dev->device_lock);
 
 	hw = to_me_hw(dev);
-- 
2.34.1

[PATCH 2/3] mei: txe: remove unnecessary NULL pointer checks

[Bjorn Helgaas]

From: Bjorn Helgaas <bhelgaas@google.com>

The .shutdown(), .remove(), and power management callbacks are never called
unless .probe() has already returned success, which means it has set
drvdata to a non-NULL pointer, so "dev" can never be NULL in the other
callbacks.

Remove the unnecessary checks.

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
---
 drivers/misc/mei/pci-txe.c | 40 ++++++--------------------------------
 1 file changed, 6 insertions(+), 34 deletions(-)

diff --git a/drivers/misc/mei/pci-txe.c b/drivers/misc/mei/pci-txe.c
index fa20d9a27813..2a584104ba38 100644
--- a/drivers/misc/mei/pci-txe.c
+++ b/drivers/misc/mei/pci-txe.c
@@ -166,11 +166,7 @@ static int mei_txe_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
  */
 static void mei_txe_shutdown(struct pci_dev *pdev)
 {
-	struct mei_device *dev;
-
-	dev = pci_get_drvdata(pdev);
-	if (!dev)
-		return;
+	struct mei_device *dev = pci_get_drvdata(pdev);
 
 	dev_dbg(&pdev->dev, "shutdown\n");
 	mei_stop(dev);
@@ -191,13 +187,7 @@ static void mei_txe_shutdown(struct pci_dev *pdev)
  */
 static void mei_txe_remove(struct pci_dev *pdev)
 {
-	struct mei_device *dev;
-
-	dev = pci_get_drvdata(pdev);
-	if (!dev) {
-		dev_err(&pdev->dev, "mei: dev == NULL\n");
-		return;
-	}
+	struct mei_device *dev = pci_get_drvdata(pdev);
 
 	pm_runtime_get_noresume(&pdev->dev);
 
@@ -218,9 +208,6 @@ static int mei_txe_pci_suspend(struct device *device)
 	struct pci_dev *pdev = to_pci_dev(device);
 	struct mei_device *dev = pci_get_drvdata(pdev);
 
-	if (!dev)
-		return -ENODEV;
-
 	dev_dbg(&pdev->dev, "suspend\n");
 
 	mei_stop(dev);
@@ -236,13 +223,9 @@ static int mei_txe_pci_suspend(struct device *device)
 static int mei_txe_pci_resume(struct device *device)
 {
 	struct pci_dev *pdev = to_pci_dev(device);
-	struct mei_device *dev;
+	struct mei_device *dev = pci_get_drvdata(pdev);
 	int err;
 
-	dev = pci_get_drvdata(pdev);
-	if (!dev)
-		return -ENODEV;
-
 	pci_enable_msi(pdev);
 
 	mei_clear_interrupts(dev);
@@ -273,13 +256,10 @@ static int mei_txe_pci_resume(struct device *device)
 #ifdef CONFIG_PM
 static int mei_txe_pm_runtime_idle(struct device *device)
 {
-	struct mei_device *dev;
+	struct mei_device *dev = dev_get_drvdata(device);
 
 	dev_dbg(device, "rpm: txe: runtime_idle\n");
 
-	dev = dev_get_drvdata(device);
-	if (!dev)
-		return -ENODEV;
 	if (mei_write_is_idle(dev))
 		pm_runtime_autosuspend(device);
 
@@ -287,15 +267,11 @@ static int mei_txe_pm_runtime_idle(struct device *device)
 }
 static int mei_txe_pm_runtime_suspend(struct device *device)
 {
-	struct mei_device *dev;
+	struct mei_device *dev = dev_get_drvdata(device);
 	int ret;
 
 	dev_dbg(device, "rpm: txe: runtime suspend\n");
 
-	dev = dev_get_drvdata(device);
-	if (!dev)
-		return -ENODEV;
-
 	mutex_lock(&dev->device_lock);
 
 	if (mei_write_is_idle(dev))
@@ -317,15 +293,11 @@ static int mei_txe_pm_runtime_suspend(struct device *device)
 
 static int mei_txe_pm_runtime_resume(struct device *device)
 {
-	struct mei_device *dev;
+	struct mei_device *dev = dev_get_drvdata(device);
 	int ret;
 
 	dev_dbg(device, "rpm: txe: runtime resume\n");
 
-	dev = dev_get_drvdata(device);
-	if (!dev)
-		return -ENODEV;
-
 	mutex_lock(&dev->device_lock);
 
 	mei_enable_interrupts(dev);
-- 
2.34.1

[PATCH 3/3] mei: me: remove unnecessary NULL pointer checks

[Bjorn Helgaas]

From: Bjorn Helgaas <bhelgaas@google.com>

The .shutdown(), .remove(), and power management callbacks are never called
unless .probe() has already returned success, which means it has set
drvdata to a non-NULL pointer, so "dev" can never be NULL in the other
callbacks.

Remove the unnecessary checks.

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
---
 drivers/misc/mei/pci-me.c | 38 ++++++--------------------------------
 1 file changed, 6 insertions(+), 32 deletions(-)

diff --git a/drivers/misc/mei/pci-me.c b/drivers/misc/mei/pci-me.c
index 676d566f38dd..1f0d983d3f06 100644
--- a/drivers/misc/mei/pci-me.c
+++ b/drivers/misc/mei/pci-me.c
@@ -295,11 +295,7 @@ static int mei_me_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
  */
 static void mei_me_shutdown(struct pci_dev *pdev)
 {
-	struct mei_device *dev;
-
-	dev = pci_get_drvdata(pdev);
-	if (!dev)
-		return;
+	struct mei_device *dev = pci_get_drvdata(pdev);
 
 	dev_dbg(&pdev->dev, "shutdown\n");
 	mei_stop(dev);
@@ -320,11 +316,7 @@ static void mei_me_shutdown(struct pci_dev *pdev)
  */
 static void mei_me_remove(struct pci_dev *pdev)
 {
-	struct mei_device *dev;
-
-	dev = pci_get_drvdata(pdev);
-	if (!dev)
-		return;
+	struct mei_device *dev = pci_get_drvdata(pdev);
 
 	if (mei_pg_is_enabled(dev))
 		pm_runtime_get_noresume(&pdev->dev);
@@ -353,9 +345,6 @@ static int mei_me_pci_suspend(struct device *device)
 	struct pci_dev *pdev = to_pci_dev(device);
 	struct mei_device *dev = pci_get_drvdata(pdev);
 
-	if (!dev)
-		return -ENODEV;
-
 	dev_dbg(&pdev->dev, "suspend\n");
 
 	mei_stop(dev);
@@ -371,14 +360,10 @@ static int mei_me_pci_suspend(struct device *device)
 static int mei_me_pci_resume(struct device *device)
 {
 	struct pci_dev *pdev = to_pci_dev(device);
-	struct mei_device *dev;
+	struct mei_device *dev = pci_get_drvdata(pdev);
 	unsigned int irqflags;
 	int err;
 
-	dev = pci_get_drvdata(pdev);
-	if (!dev)
-		return -ENODEV;
-
 	pci_enable_msi(pdev);
 
 	irqflags = pci_dev_msi_enabled(pdev) ? IRQF_ONESHOT : IRQF_SHARED;
@@ -419,13 +404,10 @@ static void mei_me_pci_complete(struct device *device)
 #ifdef CONFIG_PM
 static int mei_me_pm_runtime_idle(struct device *device)
 {
-	struct mei_device *dev;
+	struct mei_device *dev = dev_get_drvdata(device);
 
 	dev_dbg(device, "rpm: me: runtime_idle\n");
 
-	dev = dev_get_drvdata(device);
-	if (!dev)
-		return -ENODEV;
 	if (mei_write_is_idle(dev))
 		pm_runtime_autosuspend(device);
 
@@ -434,15 +416,11 @@ static int mei_me_pm_runtime_idle(struct device *device)
 
 static int mei_me_pm_runtime_suspend(struct device *device)
 {
-	struct mei_device *dev;
+	struct mei_device *dev = dev_get_drvdata(device);
 	int ret;
 
 	dev_dbg(device, "rpm: me: runtime suspend\n");
 
-	dev = dev_get_drvdata(device);
-	if (!dev)
-		return -ENODEV;
-
 	mutex_lock(&dev->device_lock);
 
 	if (mei_write_is_idle(dev))
@@ -462,15 +440,11 @@ static int mei_me_pm_runtime_suspend(struct device *device)
 
 static int mei_me_pm_runtime_resume(struct device *device)
 {
-	struct mei_device *dev;
+	struct mei_device *dev = dev_get_drvdata(device);
 	int ret;
 
 	dev_dbg(device, "rpm: me: runtime resume\n");
 
-	dev = dev_get_drvdata(device);
-	if (!dev)
-		return -ENODEV;
-
 	mutex_lock(&dev->device_lock);
 
 	ret = mei_me_pg_exit_sync(dev);
-- 
2.34.1