From: Stefan Richter <stefanr@s5r6.in-berlin.de>
Date: Mon, 24 Mar 2008 19:57:12 +0000 (+0100)
Subject: firewire: fix synchronization of gap counts
X-Git-Tag: v2.6.26-rc1~1141^2~1
X-Git-Url: http://pilppa.com/gitweb/?a=commitdiff_plain;h=25b1c3d8889f982ebc6c7b996cfc7fa5f1dce533;p=linux-2.6-omap-h63xx.git

firewire: fix synchronization of gap counts

Fix:  The fact that nodes had different gap counts would be overlooked
if the bus manager code would pick gap count 63 because of beta
repeaters or because of very large hop counts.  In this case, the bus
manager code would miss that it actually has to send the PHY config
packet with gap count 63.

Related trivial changes:  Use bool for an int used as bool, touch up
some comments.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
---

diff --git a/drivers/firewire/fw-card.c b/drivers/firewire/fw-card.c
index 7e4012db6ad..681bb8d4ef6 100644
--- a/drivers/firewire/fw-card.c
+++ b/drivers/firewire/fw-card.c
@@ -220,7 +220,7 @@ fw_card_bm_work(struct work_struct *work)
 	struct bm_data bmd;
 	unsigned long flags;
 	int root_id, new_root_id, irm_id, gap_count, generation, grace;
-	int do_reset = 0;
+	bool do_reset = false;
 
 	spin_lock_irqsave(&card->lock, flags);
 	local_node = card->local_node;
@@ -360,14 +360,14 @@ fw_card_bm_work(struct work_struct *work)
 		gap_count = 63;
 
 	/*
-	 * Finally, figure out if we should do a reset or not.  If we've
-	 * done less that 5 resets with the same physical topology and we
+	 * Finally, figure out if we should do a reset or not.  If we have
+	 * done less than 5 resets with the same physical topology and we
 	 * have either a new root or a new gap count setting, let's do it.
 	 */
 
 	if (card->bm_retries++ < 5 &&
 	    (card->gap_count != gap_count || new_root_id != root_id))
-		do_reset = 1;
+		do_reset = true;
 
 	spin_unlock_irqrestore(&card->lock, flags);
 
diff --git a/drivers/firewire/fw-topology.c b/drivers/firewire/fw-topology.c
index ebdec4c6c68..213b0ff8f3d 100644
--- a/drivers/firewire/fw-topology.c
+++ b/drivers/firewire/fw-topology.c
@@ -290,12 +290,11 @@ static struct fw_node *build_tree(struct fw_card *card,
 			beta_repeaters_present = true;
 
 		/*
-		 * If all PHYs does not report the same gap count
-		 * setting, we fall back to 63 which will force a gap
-		 * count reconfiguration and a reset.
+		 * If PHYs report different gap counts, set an invalid count
+		 * which will force a gap count reconfiguration and a reset.
 		 */
 		if (SELF_ID_GAP_COUNT(q) != gap_count)
-			gap_count = 63;
+			gap_count = 0;
 
 		update_hop_count(node);