[media] SOLO6x10: remove unneeded register locking and barriers

readl() and writel() are atomic, we don't need the spin lock. Also, flushing posted write buffer isn't required. Especially on read :-) Signed-off-by: Krzysztof Ha?asa <[email protected]> Signed-off-by: Hans Verkuil <[email protected]> Signed-off-by: Mauro Carvalho Chehab <[email protected]>
redbrain17 · Jul 6, 2015 · e1ceb25 · e1ceb25
1 parent dd43a62
commit e1ceb25
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Showing 2 changed files with 1 addition and 26 deletions.
diff --git a/drivers/media/pci/solo6x10/solo6x10-core.c b/drivers/media/pci/solo6x10/solo6x10-core.c
@@ -483,7 +483,6 @@ static int solo_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 
 	solo_dev->type = id->driver_data;
 	solo_dev->pdev = pdev;
-	spin_lock_init(&solo_dev->reg_io_lock);
 	ret = v4l2_device_register(&pdev->dev, &solo_dev->v4l2_dev);
 	if (ret)
 		goto fail_probe;

diff --git a/drivers/media/pci/solo6x10/solo6x10.h b/drivers/media/pci/solo6x10/solo6x10.h
@@ -199,7 +199,6 @@ struct solo_dev {
 	int			nr_ext;
 	u32			irq_mask;
 	u32			motion_mask;
-	spinlock_t		reg_io_lock;
 	struct v4l2_device	v4l2_dev;
 
 	/* tw28xx accounting */
@@ -281,36 +280,13 @@ struct solo_dev {
 
 static inline u32 solo_reg_read(struct solo_dev *solo_dev, int reg)
 {
-	unsigned long flags;
-	u32 ret;
-	u16 val;
-
-	spin_lock_irqsave(&solo_dev->reg_io_lock, flags);
-
-	ret = readl(solo_dev->reg_base + reg);
-	rmb();
-	pci_read_config_word(solo_dev->pdev, PCI_STATUS, &val);
-	rmb();
-
-	spin_unlock_irqrestore(&solo_dev->reg_io_lock, flags);
-
-	return ret;
+	return readl(solo_dev->reg_base + reg);
 }
 
 static inline void solo_reg_write(struct solo_dev *solo_dev, int reg,
 				  u32 data)
 {
-	unsigned long flags;
-	u16 val;
-
-	spin_lock_irqsave(&solo_dev->reg_io_lock, flags);
-
 	writel(data, solo_dev->reg_base + reg);
-	wmb();
-	pci_read_config_word(solo_dev->pdev, PCI_STATUS, &val);
-	rmb();
-
-	spin_unlock_irqrestore(&solo_dev->reg_io_lock, flags);
 }
 
 static inline void solo_irq_on(struct solo_dev *dev, u32 mask)