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usblp: continuously poll for status

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The usblp in 2.6.18 polled for status regardless if we actually needed it.
At some point I dropped it, to save the batteries if nothing else.
As it turned out, printers exist (e.g. Canon BJC-3000) that need prodding
this way or else they stop. This patch restores the old behaviour.
If you want to save battery, don't leave jobs in the print queue.

I tested this on my printers by printing and examining usbmon traces
to make sure status is being requested and printers continue to print.
Tuomas Jäntti verified the fix on BJC-3000.

Signed-off-by: Pete Zaitcev <zaitcev@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Pete Zaitcev 2009-01-06 17:20:42 -07:00 committed by Greg Kroah-Hartman
parent 5c16034d73
commit dd44be6b17
1 changed files with 7 additions and 4 deletions
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11
drivers/usb/class/usblp.c
View file

@ -880,16 +880,19 @@ static int usblp_wwait(struct usblp *usblp, int nonblock)
if (rc <= 0)
break;
if (usblp->flags & LP_ABORT) {
if (schedule_timeout(msecs_to_jiffies(5000)) == 0) {
if (schedule_timeout(msecs_to_jiffies(1500)) == 0) {
if (usblp->flags & LP_ABORT) {
err = usblp_check_status(usblp, err);
if (err == 1) { /* Paper out */
rc = -ENOSPC;
break;
}
} else {
/* Prod the printer, Gentoo#251237. */
mutex_lock(&usblp->mut);
usblp_read_status(usblp, usblp->statusbuf);
mutex_unlock(&usblp->mut);
}
} else {
schedule();
}
}
set_current_state(TASK_RUNNING);