write urb error -90

[Sendhilraj T <Sendhilraj.T@xxxxxxxxxxxx>]

Hello,
My usb device driver gets compiled and
file system is getting created in the /dev as below..

usbdev1.1_ep00
usbdev1.1_ep81
usbdev1.3_ep00
usbdev1.3_ep05
usbdev1.3_ep87
usbdev2.1_ep00
usbdev2.1_ep81
USBPIPESKEL

USBPIPESKEL is the name give in 
static struct usb_class_driver skel_class
= {
         .name
=         "USBPIPESKEL",
        .fops =
        &skel_fops,
        .minor_base
=   USB_SKEL_MINOR_BASE,
};


My test application to read and write
to the device is the one below

        int
fd,ret;
        unsigned
 int buf;
        unsigned
char arr[2]={0x55,0x66};
        int
choice,i;

        if((fd
=  open("/dev/USBPIPESKEL" ,O_RDWR)) == -1)
        {
         
      printf("\nopen error\n");
        }
        printf("usb
device opened:fd=%d\n",fd);

        ret
= write(fd,arr,2);
        if(ret
== -1)
         
      perror("write:");
        printf("usb
device write return = %d\n",ret);

        close(fd);
        return(1);
}


after insmoding my driver if I run my
test application
I am getting the error below

usb device opened:fd=3
write:: Message too long
usb device write return = -1

when i run dmesg i get the follwing
message

skel_write - failed submitting write
urb, error -90

I would like to know the cause of the
error and how can I
fix it up?

Thanks