linux-kernel - [PATCH 2/5] firewire: core: increase bus manager grace period

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Date:	Tue, 10 Mar 2009 21:07:46 +0100 (CET)
From:	Stefan Richter <stefanr@...6.in-berlin.de>
To:	linux1394-devel@...ts.sourceforge.net
cc:	linux-kernel@...r.kernel.org
Subject: [PATCH 2/5] firewire: core: increase bus manager grace period

Per IEEE 1394 clause 8.4.2.5, bus manager capable nodes which are not
incumbent shall wait at least 125ms before trying to establish
themselves as bus manager.

Signed-off-by: Stefan Richter <stefanr@...6.in-berlin.de>
---
 drivers/firewire/fw-card.c |   11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

Index: linux/drivers/firewire/fw-card.c
===================================================================
--- linux.orig/drivers/firewire/fw-card.c
+++ linux/drivers/firewire/fw-card.c
@@ -368,9 +368,11 @@ static void fw_card_bm_work(struct work_
 			atomic_read(&root_device->state) == FW_DEVICE_RUNNING;
 	root_device_is_cmc = root_device && root_device->cmc;
 	root_id = root_node->node_id;
-	grace = time_after(jiffies, card->reset_jiffies + DIV_ROUND_UP(HZ, 10));
 	irm_device = irm_node->data;
 	local_device = local_node->data;
+
+	grace = time_after(jiffies, card->reset_jiffies + DIV_ROUND_UP(HZ, 8));
+
 	if (is_next_generation(generation, card->bm_generation) ||
 	    (card->bm_generation != generation && grace)) {
 		/*
@@ -434,12 +436,11 @@ static void fw_card_bm_work(struct work_
 		}
 	} else if (card->bm_generation != generation) {
 		/*
-		 * OK, we weren't BM in the last generation, and it's
-		 * less than 100ms since last bus reset. Reschedule
-		 * this task 100ms from now.
+		 * We weren't BM in the last generation, and the last
+		 * bus reset is less than 125ms ago.  Reschedule this job.
 		 */
 		spin_unlock_irqrestore(&card->lock, flags);
-		fw_schedule_bm_work(card, DIV_ROUND_UP(HZ, 10));
+		fw_schedule_bm_work(card, DIV_ROUND_UP(HZ, 8));
 		goto out;
 	}
 

-- 
Stefan Richter
-=====-==--= --== -=-=-
http://arcgraph.de/sr/

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