linux_dnw(修改发送大文件错误)

#include <linux/kernel.h> #include <linux/module.h> #include <linux/usb.h> #include <linux/fs.h> #include <linux/mutex.h> #include <linux/slab.h> #include <linux/uaccess.h> #define SECBULK_MAJOR 102 #define SECBULK_MINOR 0 #define DRIVER_NAME "secbulk" #define BULKOUT_BUFFER_SIZE 512 struct secbulk_dev { struct usb_device *udev; struct mutex io_mutex; char* bulkout_buffer; __u8 bulk_out_endpointAddr; }; static struct usb_class_driver secbulk_class; static struct usb_device_id secbulk_table[]= { { USB_DEVICE(0x5345, 0x1234)}, { } }; static struct usb_driver secbulk_driver; static void secbulk_disconnect(struct usb_interface *interface) { struct secbulk_dev *dev = NULL; printk(KERN_INFO "secbulk:secbulk disconnected!\n"); dev = usb_get_intfdata(interface); if( NULL != dev ) kfree(dev); usb_deregister_dev(interface, &secbulk_class); return; } static ssize_t secbulk_read(struct file *file, char __user *buf, size_t len, loff_t *loff) { return -EPERM; } static ssize_t secbulk_write(struct file *file, const char __user *buf, size_t len, loff_t *loff) { size_t to_write; struct secbulk_dev *dev = file->private_data; int ret; int actual_length; size_t total_writed; total_writed = 0; while(len > 0) { to_write = min(len, BULKOUT_BUFFER_SIZE); if(copy_from_user(dev->bulkout_buffer, buf+total_writed, to_write)) { printk(KERN_ERR "secbulk:copy_from_user failed!\n"); return -EFAULT; } ret = usb_bulk_msg(dev->udev, usb_sndbulkpipe(dev->udev, dev->bulk_out_endpointAddr), dev->bulkout_buffer, to_write, &actual_length, 3*HZ); if(ret || actual_length!=to_write) { printk(KERN_ERR "secbulk:usb_bulk_msg failed!\n"); return -EFAULT; } len -= to_write; total_writed += to_write; } return total_writed; } static int secbulk_open(struct inode *node, struct file *file) { struct usb_interface *interface; struct secbulk_dev *dev; interface = usb_find_interface(&secbulk_driver, iminor(node)); if(!interface) return -ENODEV; dev = usb_get_intfdata(interface); dev->bulkout_buffer = kzalloc(BULKOUT_BUFFER_SIZE, GFP_KERNEL); if(!(dev->bulkout_buffer)) return -ENOMEM; if(!mutex_trylock(&dev->io_mutex)) return -EBUSY; file->private_data = dev; return 0; } static int secbulk_release(struct inode *node, struct file *file) { struct secbulk_dev *dev; dev = (struct secbulk_dev*)(file->private_data); kfree(dev->bulkout_buffer); mutex_unlock(&dev->io_mutex); return 0; } static struct file_operations secbulk_fops = { .owner = THIS_MODULE, .read = secbulk_read, .write = secbulk_write, .open = secbulk_open, .release= secbulk_release, }; static struct usb_class_driver secbulk_class = { .name = "secbulk%d", .fops = &secbulk_fops, .minor_base= 100, }; static int secbulk_probe(struct usb_interface *interface, const struct usb_device_id *id) { int ret; struct secbulk_dev *dev; struct usb_host_interface *iface_desc; struct usb_endpoint_descriptor *endpoint; int i; printk(KERN_INFO "secbulk:secbulk probing...\n"); dev = kzalloc(sizeof(*dev), GFP_KERNEL); if(!dev) { ret = -ENOMEM; goto error; } iface_desc = interface->cur_altsetting; for(i=0; i < iface_desc->desc.bNumEndpoints; i++) { endpoint = &(iface_desc->endpoint[i].desc); if(!dev->bulk_out_endpointAddr && usb_endpoint_is_bulk_out(endpoint)) { printk(KERN_INFO "secbulk:bulk out endpoint found!\n"); dev->bulk_out_endpointAddr = endpoint->bEndpointAddress; break; } } if(!(dev->bulk_out_endpointAddr)) { ret = -EBUSY; goto error; } ret = usb_register_dev(interface, &secbulk_class); if(ret) { printk(KERN_ERR "secbulk: usb_register_dev failed!\n"); return ret; } dev->udev = usb_get_dev(interface_to_usbdev(interface)); usb_set_intfdata(interface, dev); mutex_init(&dev->io_mutex); return 0; error: if(!dev) kfree(dev); return ret; } static struct usb_driver secbulk_driver= { .name= "secbulk", .probe= secbulk_probe, .disconnect= secbulk_disconnect, .id_table= secbulk_table, .supports_autosuspend=0, }; static int __init secbulk_init(void) { int result; printk(KERN_INFO "secbulk:secbulk loaded\n"); result = usb_register(&secbulk_driver); if(result) { printk(KERN_ERR "secbulk:usb_register failed: %d", result); return result; } return 0; } static void __exit secbulk_exit(void) { usb_deregister(&secbulk_driver); printk(KERN_INFO "secbulk:secbulk unloaded\n"); } module_init(secbulk_init); module_exit(secbulk_exit); MODULE_LICENSE("GPL");