[fedora-india] create_proc_entry hangs the kernel

Giriprasad Deviprasad g_pr21 at yahoo.in
Fri Dec 10 11:51:19 UTC 2010


Hi,



 The following program hangs the kernel, when the insmod on it, is run. Can any one provide ideas why :



#include <linux/module.h>       // for init_module()

#include <linux/proc_fs.h>      // for create_proc_info_entry()

#include <asm/io.h>             // for inb(), outb()



int my_func( char *buf, char **start, off_t off, int count, int *eof, void *data )

{

        return 0;

}



char modname[] = "cmos";

static int __init my_init( void )

{



        struct proc_dir_entry *pde, *tmp;

        tmp = kmalloc(sizeof(struct proc_dir_entry), GFP_KERNEL);

        pde= create_proc_entry(modname, S_IFDIR | S_IRUGO | S_IXUGO , tmp);



        pde->nlink = 1;

        pde->read_proc = my_func;

        if(pde)

                printk("proc_create sucessfull name = %s\n", pde->name);

        else

                printk("proc_create not so sucessfull. Exiting........... \n");

        return 0;

}



static void __exit my_exit(void )

{

        remove_proc_entry( modname, NULL );

        printk("Exiting ................\n");

}



module_init( my_init );

module_exit( my_exit );

MODULE_LICENSE("GPL");



Thanks,

Giriprasad





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