linux-kernel - [PATCH 1/1] Char: moxa, fix and optimise empty timer

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Date:	Wed, 25 Jul 2007 23:43:29 +0200 (CEST)
From:	Jiri Slaby <jirislaby@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	<linux-kernel@...r.kernel.org>
Subject: [PATCH 1/1] Char: moxa, fix and optimise empty timer

moxa, fix and optimise empty timer

don't wait and delete empty timer in empty timer function. Also fire next
empty timer at rounded jiffies to save power.

Signed-off-by: Jiri Slaby <jirislaby@...il.com>

---
commit da52793b6347e8b6b048526ce2422e29b20bb335
tree ad0bee78e45beef89dc740f81e0606d782296542
parent 3a69b463dcad1ff142f46e8fb74e7dc5a092eb60
author Jiri Slaby <jirislaby@...il.com> Wed, 25 Jul 2007 23:42:49 +0200
committer Jiri Slaby <jirislaby@...il.com> Wed, 25 Jul 2007 23:42:49 +0200

 drivers/char/moxa.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/char/moxa.c b/drivers/char/moxa.c
index ed76f0a..5000b3b 100644
--- a/drivers/char/moxa.c
+++ b/drivers/char/moxa.c
@@ -1040,14 +1040,14 @@ static void check_xmit_empty(unsigned long data)
 	struct moxa_port *ch;
 
 	ch = (struct moxa_port *) data;
-	del_timer_sync(&moxa_ports[ch->port].emptyTimer);
 	if (ch->tty && (ch->statusflags & EMPTYWAIT)) {
 		if (MoxaPortTxQueue(ch->port) == 0) {
 			ch->statusflags &= ~EMPTYWAIT;
 			tty_wakeup(ch->tty);
 			return;
 		}
-		mod_timer(&moxa_ports[ch->port].emptyTimer, jiffies + HZ);
+		mod_timer(&moxa_ports[ch->port].emptyTimer,
+				round_jiffies(jiffies + HZ));
 	} else
 		ch->statusflags &= ~EMPTYWAIT;
 }
-
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