PVR2_CTL_BUFFSIZE
unsigned char cmd_buffer[PVR2_CTL_BUFFSIZE];
hdw->ctl_write_buffer = kmalloc(PVR2_CTL_BUFFSIZE,GFP_KERNEL);
hdw->ctl_read_buffer = kmalloc(PVR2_CTL_BUFFSIZE,GFP_KERNEL);
if (write_len > PVR2_CTL_BUFFSIZE) {
write_len,PVR2_CTL_BUFFSIZE);
if (read_len > PVR2_CTL_BUFFSIZE) {
read_len, PVR2_CTL_BUFFSIZE);