Re: problem in initilisation

[Ravi <ravivsn@roc.co.in>]

Megharaj,
Intention is to write character device which registers a logical 
network device with the kernel.
-Ravi
Megharaj wrote:

> u r trying to register netdev
>  
>
> > > i = register_netdevice((pTestStruct->dev));
> > >      
>
> and trying to unregister chardev....
>  
>
> > > unregister_chrdev(16,"test");
> > >      
>
>
> so check out which device u want to regiter this perticular driver for
> netdev or chardev.....
>
> Megharaj.
>
> ----- Original Message -----
> From: "Ravi Kumar" <ravivsn@rocsys.com>
> To: <kernelnewbies@nl.linux.org>
> Sent: Monday, April 19, 2004 10:53 AM
> Subject: problem in initilisation
>
>
>  
>
> > HI,
> > I wrote one character device which should create network device. When I
> > do insmod it gave a segmentation fault and lsmod shows initializing.
> >
> > A dmesg shows:
> >
> > EIP is at init_module [testdriver] 0xa6 (2.4.18-14)
> > eax: 00000000   ebx: ffffffea   ecx: c05b6000   edx: c8e7f4d3
> > esi: 00000000   edi: 00000000   ebp: c672df18   esp: c672df00
> > ds: 0018   es: 0018   ss: 0018
> > Process insmod (pid: 9922, stackpage=c672d000)
> > Stack: 00200206 ffffffff 00002f3f c05b6940 00000000 00000000 c8e7f000
> > c011bf79
> >       c8e7f060 08075228 00000908 00000000 080756f4 0000052c 00000060
> > 00000060
> >       0000000a c05b6c40 c6231000 c6e7e000 00000060 c8def000 c8e7f060
> > 00000968
> > Call Trace: [<c011bf79>] sys_init_module [kernel] 0x4d9 (0xc672df1c))
> > [<c8e7f060>] test_open [testdriver] 0x0 (0xc672df20))
> > [<c8e7f060>] test_open [testdriver] 0x0 (0xc672df58))
> > [<c010910f>] system_call [kernel] 0x33 (0xc672dfc0))
> >
> >
> > Code: c7 40 34 fe f0 e7 c8 83 ec 08 68 d4 f4 e7 c8 8b 45 f4 ff 30
> >
> >
> > I am attaching the code, pls help me to solve this problem.
> > Thanks a lot,
> > -Ravi
> >
> >    
>
>
> ----------------------------------------------------------------------------
> ----
>
>
>  
>
> > #ifndef __KERNEL__
> > #   define __KERNEL__
> > #endif
> >
> > #ifndef MODULE
> > #  define MODULE
> > #endif
> >
> > #define DEVNAME "testdev"
> >
> > #include <linux/module.h>
> > #include <linux/kernel.h>
> > #include <linux/fs.h>
> > #include <linux/slab.h>
> >
> > #include <linux/netdevice.h>
> > #include <linux/if_ether.h>
> >
> >
> >
> > int test_open(struct inode *,struct file *);
> > int test_release(struct inode *,struct file*);
> >
> >
> > struct test_struct{
> > struct net_device *dev;
> > char name[IFNAMSIZ];
> > };
> >
> >
> >
> > struct file_operations test_fop={
> > llseek: NULL,
> > read:   NULL,
> > write:  NULL,
> > ioctl:  NULL,
> > open:   test_open,
> > release: test_release,
> > };
> >
> >
> >
> > int test_open(struct inode *inode, struct file *filep)
> > {
> > MOD_INC_USE_COUNT;
> > return 0;
> > }
> >
> > int test_release(struct inode *inode, struct file *filep)
> > {
> > MOD_DEC_USE_COUNT;
> > return 0;
> > }
> >
> > int testdev_open(struct net_device *dev)
> > {
> > MOD_INC_USE_COUNT;
> > return 0;
> > }
> >
> > int testdev_close(struct net_device *dev)
> > {
> > unregister_netdev(dev);
> > MOD_DEC_USE_COUNT;
> > return 0;
> > }
> >
> > static int test_init_dev(struct net_device *dev)
> > {
> > struct test_struct *c;
> >
> > dev->priv = kmalloc(sizeof(struct net_device),GFP_KERNEL);
> > if(!dev->priv)
> > {
> > printk(KERN_ERR "out of memory while allocating to dev->priv\n");
> > return -ENOMEM;
> > }
> > c = (struct test_struct *)dev->priv;
> > if(!c)
> > return -ENODEV;
> >
> > memset(c,0,sizeof(struct test_struct));
> >        c->dev = dev;
> >        ether_setup(dev);
> >
> > dev->open  = testdev_open;
> > dev->stop  = testdev_close;
> > dev->mtu   = ETH_DATA_LEN;
> > dev_init_buffers(dev);
> > return 0;
> > }
> >
> >
> > int init_module(void)
> > {
> > int result,i;
> >
> >        struct test_struct *pTestStruct;
> > result = register_chrdev(16,"test",&test_fop);
> > if( result < 0 ){
> > printk(KERN_WARNING "test: cant get major\n");
> > return result;
> > }
> >        pTestStruct = (struct test_struct *)kmalloc(sizeof( struct
> >    
> test_struct),GFP_KERNEL);
>  
>
> > if(!pTestStruct)
> > {
> > printk(KERN_ERR "failed to allocate memory\n");
> > return -ENOMEM;
> > }
> >
> >        memset((void *)pTestStruct,0,sizeof(pTestStruct));
> > sprintf(pTestStruct->name, DEVNAME);
> >        //pTestStruct->dev->priv = pTestStruct;
> > pTestStruct->dev->init = test_init_dev;
> >
> > i = dev_alloc_name(pTestStruct->dev,"testdev%d");
> > if(i < 0 )
> > {
> > printk(KERN_ERR "cant allocate device\n");
> > return -ENODEV;
> > }
> > i = register_netdevice((pTestStruct->dev));
> > if( i < 0 )
> > printk(KERN_ERR "register netdevice failed\n");
> >
> > return 0;
> > }
> >
> > void cleanup_module(void)
> > {
> >
> > unregister_chrdev(16,"test");
> > }
> >
> >
> >
> >
> >
> >
> >
> >    
>
>
>
>
> --
> Kernelnewbies: Help each other learn about the Linux kernel.
> Archive:       http://mail.nl.linux.org/kernelnewbies/
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>
>  




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