From dd44be6b17ac52238aa6c7f46b906d9fb76e7052 Mon Sep 17 00:00:00 2001
From: Pete Zaitcev <zaitcev@redhat.com>
Date: Tue, 6 Jan 2009 17:20:42 -0700
Subject: 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>
---
drivers/usb/class/usblp.c | 11 +++++++----
1 file changed, 7 insertions(+), 4 deletions(-)
diff --git a/drivers/usb/class/usblp.c b/drivers/usb/class/usblp.c
index 3f3ee1351930..d2747a49b974 100644
--- a/drivers/usb/class/usblp.c
+++ b/drivers/usb/class/usblp.c
@@ -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);
--
cgit