Staging: kpc2000: kpc_dma: Resolve trailing whitespace error reported by checkpatch

Resolve trailing whitespace error from checkpatch.pl
ERROR: trailing whitespace
Signed-off-by: Vandana BN <bnvandana@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/kpc2000/kpc_dma/dma.c

@@ -15,10 +15,10 @@ static
 irqreturn_t  ndd_irq_handler(int irq, void *dev_id)
 {
 	struct kpc_dma_device *ldev = (struct kpc_dma_device*)dev_id;
-	
+
 	if ((GetEngineControl(ldev) & ENG_CTL_IRQ_ACTIVE) || (ldev->desc_completed->MyDMAAddr != GetEngineCompletePtr(ldev)))
 		schedule_work(&ldev->irq_work);
-	
+
 	return IRQ_HANDLED;
 }
 
@@ -28,42 +28,42 @@ void  ndd_irq_worker(struct work_struct *ws)
 	struct kpc_dma_descriptor *cur;
 	struct kpc_dma_device *eng = container_of(ws, struct kpc_dma_device, irq_work);
 	lock_engine(eng);
-	
+
 	if (GetEngineCompletePtr(eng) == 0)
 		goto out;
-	
+
 	if (eng->desc_completed->MyDMAAddr == GetEngineCompletePtr(eng))
 		goto out;
-	
+
 	cur = eng->desc_completed;
 	do {
 		cur = cur->Next;
 		dev_dbg(&eng->pldev->dev, "Handling completed descriptor %p (acd = %p)\n", cur, cur->acd);
 		BUG_ON(cur == eng->desc_next); // Ordering failure.
-		
+
 		if (cur->DescControlFlags & DMA_DESC_CTL_SOP){
 			eng->accumulated_bytes = 0;
 			eng->accumulated_flags = 0;
 		}
-		
+
 		eng->accumulated_bytes += cur->DescByteCount;
 		if (cur->DescStatusFlags & DMA_DESC_STS_ERROR)
 			eng->accumulated_flags |= ACD_FLAG_ENG_ACCUM_ERROR;
-		
+
 		if (cur->DescStatusFlags & DMA_DESC_STS_SHORT)
 			eng->accumulated_flags |= ACD_FLAG_ENG_ACCUM_SHORT;
-		
+
 		if (cur->DescControlFlags & DMA_DESC_CTL_EOP){
 			if (cur->acd)
 				transfer_complete_cb(cur->acd, eng->accumulated_bytes, eng->accumulated_flags | ACD_FLAG_DONE);
 		}
-		
+
 		eng->desc_completed = cur;
 	} while (cur->MyDMAAddr != GetEngineCompletePtr(eng));
-	
+
  out:
 	SetClearEngineControl(eng, ENG_CTL_IRQ_ACTIVE, 0);
-	
+
 	unlock_engine(eng);
 }
 
@@ -73,12 +73,12 @@ void  start_dma_engine(struct kpc_dma_device *eng)
 {
 	eng->desc_next       = eng->desc_pool_first;
 	eng->desc_completed  = eng->desc_pool_last;
-	
+
 	// Setup the engine pointer registers
 	SetEngineNextPtr(eng, eng->desc_pool_first);
 	SetEngineSWPtr(eng, eng->desc_pool_first);
 	ClearEngineCompletePtr(eng);
-	
+
 	WriteEngineControl(eng, ENG_CTL_DMA_ENABLE | ENG_CTL_IRQ_ENABLE);
 }
 
@@ -92,67 +92,67 @@ int  setup_dma_engine(struct kpc_dma_device *eng, u32 desc_cnt)
 	unsigned int i;
 	int rv;
 	dev_dbg(&eng->pldev->dev, "Setting up DMA engine [%p]\n", eng);
-	
+
 	caps = GetEngineCapabilities(eng);
-	
+
 	if (WARN(!(caps & ENG_CAP_PRESENT), "setup_dma_engine() called for DMA Engine at %p which isn't present in hardware!\n", eng))
 		return -ENXIO;
-	
+
 	if (caps & ENG_CAP_DIRECTION){
 		eng->dir = DMA_FROM_DEVICE;
 	} else {
 		eng->dir = DMA_TO_DEVICE;
 	}
-	
+
 	eng->desc_pool_cnt = desc_cnt;
 	eng->desc_pool = dma_pool_create("KPC DMA Descriptors", &eng->pldev->dev, sizeof(struct kpc_dma_descriptor), DMA_DESC_ALIGNMENT, 4096);
-	
+
 	eng->desc_pool_first = dma_pool_alloc(eng->desc_pool, GFP_KERNEL | GFP_DMA, &head_handle);
 	if (!eng->desc_pool_first){
 		dev_err(&eng->pldev->dev, "setup_dma_engine: couldn't allocate desc_pool_first!\n");
 		dma_pool_destroy(eng->desc_pool);
 		return -ENOMEM;
 	}
-	
+
 	eng->desc_pool_first->MyDMAAddr = head_handle;
 	clear_desc(eng->desc_pool_first);
-	
+
 	cur = eng->desc_pool_first;
 	for (i = 1 ; i < eng->desc_pool_cnt ; i++){
 		next = dma_pool_alloc(eng->desc_pool, GFP_KERNEL | GFP_DMA, &next_handle);
 		if (next == NULL)
 			goto done_alloc;
-		
+
 		clear_desc(next);
 		next->MyDMAAddr = next_handle;
-		
+
 		cur->DescNextDescPtr = next_handle;
 		cur->Next = next;
 		cur = next;
 	}
-	
+
  done_alloc:
 	// Link the last descriptor back to the first, so it's a circular linked list
 	cur->Next = eng->desc_pool_first;
 	cur->DescNextDescPtr = eng->desc_pool_first->MyDMAAddr;
-	
+
 	eng->desc_pool_last = cur;
 	eng->desc_completed = eng->desc_pool_last;
-	
+
 	// Setup work queue
 	INIT_WORK(&eng->irq_work, ndd_irq_worker);
-	
+
 	// Grab IRQ line
 	rv = request_irq(eng->irq, ndd_irq_handler, IRQF_SHARED, KP_DRIVER_NAME_DMA_CONTROLLER, eng);
 	if (rv){
 		dev_err(&eng->pldev->dev, "setup_dma_engine: failed to request_irq: %d\n", rv);
 		return rv;
 	}
-	
+
 	// Turn on the engine!
 	start_dma_engine(eng);
 	unlock_engine(eng);
-	
+
 	return 0;
 }
 
@@ -160,10 +160,10 @@ void  stop_dma_engine(struct kpc_dma_device *eng)
 {
 	unsigned long timeout;
 	dev_dbg(&eng->pldev->dev, "Destroying DMA engine [%p]\n", eng);
-	
+
 	// Disable the descriptor engine
 	WriteEngineControl(eng, 0);
-	
+
 	// Wait for descriptor engine to finish current operaion
 	timeout = jiffies + (HZ / 2);
 	while (GetEngineControl(eng) & ENG_CTL_DMA_RUNNING){
@@ -172,10 +172,10 @@ void  stop_dma_engine(struct kpc_dma_device *eng)
 			break;
 		}
 	}
-	
+
 	// Request a reset
 	WriteEngineControl(eng, ENG_CTL_DMA_RESET_REQUEST);
-	
+
 	// Wait for reset request to be processed
 	timeout = jiffies + (HZ / 2);
 	while (GetEngineControl(eng) & (ENG_CTL_DMA_RUNNING | ENG_CTL_DMA_RESET_REQUEST)){
@@ -184,10 +184,10 @@ void  stop_dma_engine(struct kpc_dma_device *eng)
 			break;
 		}
 	}
-	
+
 	// Request a reset
 	WriteEngineControl(eng, ENG_CTL_DMA_RESET);
-	
+
 	// And wait for reset to complete
 	timeout = jiffies + (HZ / 2);
 	while (GetEngineControl(eng) & ENG_CTL_DMA_RESET){
@@ -196,12 +196,12 @@ void  stop_dma_engine(struct kpc_dma_device *eng)
 			break;
 		}
 	}
-	
+
 	// Clear any persistent bits just to make sure there is no residue from the reset
 	SetClearEngineControl(eng, (ENG_CTL_IRQ_ACTIVE | ENG_CTL_DESC_COMPLETE | ENG_CTL_DESC_ALIGN_ERR | ENG_CTL_DESC_FETCH_ERR | ENG_CTL_SW_ABORT_ERR | ENG_CTL_DESC_CHAIN_END | ENG_CTL_DMA_WAITING_PERSIST), 0);
-	
+
 	// Reset performance counters
-	
+
 	// Completely disable the engine
 	WriteEngineControl(eng, 0);
 }
@@ -211,12 +211,12 @@ void  destroy_dma_engine(struct kpc_dma_device *eng)
 	struct kpc_dma_descriptor * cur;
 	dma_addr_t cur_handle;
 	unsigned int i;
-	
+
 	stop_dma_engine(eng);
-	
+
 	cur = eng->desc_pool_first;
 	cur_handle = eng->desc_pool_first->MyDMAAddr;
-	
+
 	for (i = 0 ; i < eng->desc_pool_cnt ; i++){
 		struct kpc_dma_descriptor *next = cur->Next;
 		dma_addr_t next_handle = cur->DescNextDescPtr;
@@ -224,9 +224,9 @@ void  destroy_dma_engine(struct kpc_dma_device *eng)
 		cur_handle = next_handle;
 		cur = next;
 	}
-	
+
 	dma_pool_destroy(eng->desc_pool);
-	
+
 	free_irq(eng->irq, eng);
 }
 

drivers/staging/kpc2000/kpc_dma/kpc_dma_driver.c

@@ -58,8 +58,8 @@ static ssize_t  show_engine_regs(struct device *dev, struct device_attribute *at
 	if (!pldev) return 0;
 	ldev = platform_get_drvdata(pldev);
 	if (!ldev) return 0;
-	
-	return scnprintf(buf, PAGE_SIZE, 
+
+	return scnprintf(buf, PAGE_SIZE,
 		"EngineControlStatus      = 0x%08x\n"
 		"RegNextDescPtr           = 0x%08x\n"
 		"RegSWDescPtr             = 0x%08x\n"
@@ -95,25 +95,25 @@ int  kpc_dma_probe(struct platform_device *pldev)
 	struct resource *r = NULL;
 	int rv = 0;
 	dev_t dev;
-	
+
 	struct kpc_dma_device *ldev = kzalloc(sizeof(struct kpc_dma_device), GFP_KERNEL);
 	if (!ldev){
 		dev_err(&pldev->dev, "kpc_dma_probe: unable to kzalloc space for kpc_dma_device\n");
 		rv = -ENOMEM;
 		goto err_rv;
 	}
-	
+
 	dev_dbg(&pldev->dev, "kpc_dma_probe(pldev = [%p]) ldev = [%p]\n", pldev, ldev);
-	
+
 	INIT_LIST_HEAD(&ldev->list);
-	
+
 	ldev->pldev = pldev;
 	platform_set_drvdata(pldev, ldev);
 	atomic_set(&ldev->open_count, 1);
-	
+
 	mutex_init(&ldev->sem);
 	lock_engine(ldev);
-	
+
 	// Get Engine regs resource
 	r = platform_get_resource(pldev, IORESOURCE_MEM, 0);
 	if (!r){
@@ -127,7 +127,7 @@ int  kpc_dma_probe(struct platform_device *pldev)
 		rv = -ENXIO;
 		goto err_kfree;
 	}
-	
+
 	r = platform_get_resource(pldev, IORESOURCE_IRQ, 0);
 	if (!r){
 		dev_err(&ldev->pldev->dev, "kpc_dma_probe: didn't get the IRQ resource!\n");
@@ -135,7 +135,7 @@ int  kpc_dma_probe(struct platform_device *pldev)
 		goto err_kfree;
 	}
 	ldev->irq = r->start;
-	
+
 	// Setup miscdev struct
 	dev = MKDEV(assigned_major_num, pldev->id);
 	ldev->kpc_dma_dev = device_create(kpc_dma_class, &pldev->dev, dev, ldev, "kpc_dma%d", pldev->id);
@@ -143,25 +143,25 @@ int  kpc_dma_probe(struct platform_device *pldev)
 		dev_err(&ldev->pldev->dev, "kpc_dma_probe: device_create failed: %d\n", rv);
 		goto err_kfree;
 	}
-	
+
 	// Setup the DMA engine
 	rv = setup_dma_engine(ldev, 30);
 	if (rv){
 		dev_err(&ldev->pldev->dev, "kpc_dma_probe: failed to setup_dma_engine: %d\n", rv);
 		goto err_misc_dereg;
 	}
-	
+
 	// Setup the sysfs files
 	rv = sysfs_create_files(&(ldev->pldev->dev.kobj), ndd_attr_list);
 	if (rv){
 		dev_err(&ldev->pldev->dev, "kpc_dma_probe: Failed to add sysfs files: %d\n", rv);
 		goto err_destroy_eng;
 	}
-	
+
 	kpc_dma_add_device(ldev);
-	
+
 	return 0;
-	
+
  err_destroy_eng:
 	destroy_dma_engine(ldev);
  err_misc_dereg:
@@ -178,16 +178,16 @@ int  kpc_dma_remove(struct platform_device *pldev)
 	struct kpc_dma_device *ldev = platform_get_drvdata(pldev);
 	if (!ldev)
 		return -ENXIO;
-	
+
 	dev_dbg(&ldev->pldev->dev, "kpc_dma_remove(pldev = [%p]) ldev = [%p]\n", pldev, ldev);
-	
+
 	lock_engine(ldev);
 	sysfs_remove_files(&(ldev->pldev->dev.kobj), ndd_attr_list);
 	destroy_dma_engine(ldev);
 	kpc_dma_del_device(ldev);
 	device_destroy(kpc_dma_class, MKDEV(assigned_major_num, ldev->pldev->id));
 	kfree(ldev);
-	
+
 	return 0;
 }
 
@@ -206,29 +206,29 @@ static
 int __init  kpc_dma_driver_init(void)
 {
 	int err;
-	
+
 	err = __register_chrdev(KPC_DMA_CHAR_MAJOR, 0, KPC_DMA_NUM_MINORS, "kpc_dma", &kpc_dma_fops);
 	if (err < 0){
 		pr_err("Can't allocate a major number (%d) for kpc_dma (err = %d)\n", KPC_DMA_CHAR_MAJOR, err);
 		goto fail_chrdev_register;
 	}
 	assigned_major_num = err;
-	
+
 	kpc_dma_class = class_create(THIS_MODULE, "kpc_dma");
 	err = PTR_ERR(kpc_dma_class);
 	if (IS_ERR(kpc_dma_class)){
 		pr_err("Can't create class kpc_dma (err = %d)\n", err);
 		goto fail_class_create;
 	}
-	
+
 	err = platform_driver_register(&kpc_dma_plat_driver_i);
 	if (err){
 		pr_err("Can't register platform driver for kpc_dma (err = %d)\n", err);
 		goto fail_platdriver_register;
 	}
-	
+
 	return err;
-	
+
   fail_platdriver_register:
 	class_destroy(kpc_dma_class);
   fail_class_create:

drivers/staging/kpc2000/kpc_dma/kpc_dma_driver.h

@@ -27,23 +27,23 @@ struct kpc_dma_device {
 	struct device              *kpc_dma_dev;
 	struct kobject              kobj;
 	char                        name[16];
-	
+
 	int                         dir; // DMA_FROM_DEVICE || DMA_TO_DEVICE
 	struct mutex                sem;
 	unsigned int                irq;
 	struct work_struct          irq_work;
-	
+
 	atomic_t                    open_count;
-	
+
 	size_t                      accumulated_bytes;
 	u32                         accumulated_flags;
-	
+
 	// Descriptor "Pool" housekeeping
 	u32                         desc_pool_cnt;
 	struct dma_pool            *desc_pool;
 	struct kpc_dma_descriptor  *desc_pool_first;
 	struct kpc_dma_descriptor  *desc_pool_last;
-	
+
 	struct kpc_dma_descriptor  *desc_next;
 	struct kpc_dma_descriptor  *desc_completed;
 };
@@ -90,7 +90,7 @@ struct aio_cb_data {
 	unsigned char       flags;
 	struct kiocb       *kcb;
 	size_t              len;
-	
+
 	unsigned int        page_count;
 	struct page       **user_pages;
 	struct sg_table     sgt;
@@ -119,10 +119,10 @@ struct kpc_dma_descriptor {
 		volatile u32  DescSystemAddrLS;
 		volatile u32  DescSystemAddrMS;
 		volatile u32  DescNextDescPtr;
-		
+
 		dma_addr_t    MyDMAAddr;
 		struct kpc_dma_descriptor   *Next;
-		
+
 		struct aio_cb_data  *acd;
 } __attribute__((packed));
 // DescControlFlags: