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firewire: unnecessary BM delay after generation rollover

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Noticed by Jarod Wilson:  The bus manager work was unnecessarily delayed
each time the bus generation counter rolled over.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Signed-off-by: Jarod Wilson <jwilson@redhat.com>
This commit is contained in:
Stefan Richter 2008-03-24 20:56:40 +01:00
parent a5c7f4710f
commit 8cd0bbbdff
3 changed files with 11 additions and 2 deletions
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2
drivers/firewire/fw-card.c
View file

@ -232,7 +232,7 @@ fw_card_bm_work(struct work_struct *work)
root_id = root_node->node_id;
grace = time_after(jiffies, card->reset_jiffies + DIV_ROUND_UP(HZ, 10));
if (card->bm_generation + 1 == generation ||
if (is_next_generation(generation, card->bm_generation) ||
(card->bm_generation != generation && grace)) {
/*
* This first step is to figure out who is IRM and

2
drivers/firewire/fw-topology.c
View file

@ -523,7 +523,7 @@ fw_core_handle_bus_reset(struct fw_card *card,
* previously processed one, we cannot reliably compare the
* old and new topologies.
*/
if ((generation & 0xff) != ((card->generation + 1) & 0xff) &&
if (!is_next_generation(generation, card->generation) &&
card->local_node != NULL) {
fw_notify("skipped bus generations, destroying all nodes\n");
fw_destroy_nodes(card);

9
drivers/firewire/fw-transaction.h
View file

@ -275,6 +275,15 @@ static inline void fw_card_put(struct fw_card *card)
extern void fw_schedule_bm_work(struct fw_card *card, unsigned long delay);
/*
* Check whether new_generation is the immediate successor of old_generation.
* Take counter roll-over at 255 (as per to OHCI) into account.
*/
static inline bool is_next_generation(int new_generation, int old_generation)
{
return (new_generation & 0xff) == ((old_generation + 1) & 0xff);
}
/*
* The iso packet format allows for an immediate header/payload part
* stored in 'header' immediately after the packet info plus an