From: Pete Zaitcev Date: Wed, 7 Jan 2009 00:20:42 +0000 (-0700) Subject: usblp: continuously poll for status X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=dd44be6b17ac52238aa6c7f46b906d9fb76e7052;p=linux-beck.git usblp: continuously poll for status 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 Signed-off-by: Greg Kroah-Hartman --- 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);