I am a fresh grad and new to the list.
I am writing a char driver that can have multiple devices.
I have two ioctl command -- one will register a device and the other will unregister the device.
The name of the device if also given by the application.
Currently I am able to register and unregister the device and the application can call open, read and write BUT once I unregister the device and then register again, I am not able to do open and write from the application.
Below is my dummy application code:
int main(void)
{
int file_desc;
char *hello = "hello world!";
printf("Before open\n");
file_desc = open("/dev/temp_dev", O_RDWR);
printf("Open OK\n");
write(file_desc, hello, strlen(hello));
close(file_desc);
return 0;
}
My processor hangs after "Open OK" is printed.
Also, I don't see my debug printk's that are in open function of driver under /var/log/messages.
I am adding my devices in a link list and for every open, I am traversing the link list to find the match and then opening it. When I unregister I am removing the node from the link list.
Can anyone give me a clue? Please let me know if more info is needed.
Thanks a lot J Kang
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