Re: [hpoj-devel] Printing Empty Pages FIXED

[Luke J. <lu...@jo...>]

It might have been that problem - I didn't get a chance to check because I 
resolved the problem before I read this.  I simply upgraded my kernel to 
2.6.5 and now printing works.  Probably still needed that 
"hpoj-0.91-kernel26.patch" that I applied to hpoj-0.91.

So basically 2.6.3 & 2.6.4 spit out blank pages (because of usblp.c?).  I 
won't be staying subscribed to this mailing list so could those who are 
please pass on this kernel versioning advice to others who come across this 
blank-pages problem... or maybe it could be posted on the hpoj website?  
Thanks!

-Joz

On Tuesday April 27 2004 11:23 pm, you wrote:
> Hello,
>
> check the usblp.c, to see if it has the bug described below...
>
> Printing started to work with Mandrake 10 2.6.3-4mdk kernel after applying
> following usblp.c patch from
> http://www.ussg.iu.edu/hypermail/linux/kernel/0403.0/1190.html
>
> ===
>  --- drivers/usb/class/usblp.c.orig 2004-03-05 17:09:00.412189056 +0000
>  +++ drivers/usb/class/usblp.c 2004-03-05 17:10:30.121551160 +0000
>  @@ -609,8 +609,10 @@ static ssize_t usblp_write(struct file *
>  while (writecount < count) {
>  if (!usblp->wcomplete) {
>  barrier();
>  - if (file->f_flags & O_NONBLOCK)
>  + if (file->f_flags & O_NONBLOCK) {
>  + writecount += transfer_length;
>  return writecount ? writecount : -EAGAIN;
>  + }
>  
>  timeout = USBLP_WRITE_TIMEOUT;
>  add_wait_queue(&usblp->wait, &wait);
>  @@ -670,7 +672,8 @@ static ssize_t usblp_write(struct file *
>  
>  usblp->writeurb->transfer_buffer_length = transfer_length;
>  
>  - if (copy_from_user(usblp->writeurb->transfer_buffer, buffer +
> writecount, transfer_length)) {
>  + if (copy_from_user(usblp->writeurb->transfer_buffer,
>  + buffer + writecount, transfer_length)) {
>  up(&usblp->sem);
>  return writecount ? writecount : -EFAULT;
>  }
>  ====