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| author | Stefan Richter <stefanr@s5r6.in-berlin.de> | 2008-03-24 20:56:40 +0100 |
|---|---|---|
| committer | Stefan Richter <stefanr@s5r6.in-berlin.de> | 2009-01-20 19:29:51 +0100 |
| commit | 8cd0bbbdff7471163cc6a058be8b8610ddd01d6b (patch) | |
| tree | de25f60d599ddef9a0ee88357dc418dbdf95b51d /drivers/firewire | |
| parent | a5c7f4710fba334bf613d705f97b4471b36446f8 (diff) | |
| download | talos-obmc-linux-8cd0bbbdff7471163cc6a058be8b8610ddd01d6b.tar.gz talos-obmc-linux-8cd0bbbdff7471163cc6a058be8b8610ddd01d6b.zip | |
firewire: unnecessary BM delay after generation rollover
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>
Diffstat (limited to 'drivers/firewire')
| -rw-r--r-- | drivers/firewire/fw-card.c | 2 | ||||
| -rw-r--r-- | drivers/firewire/fw-topology.c | 2 | ||||
| -rw-r--r-- | drivers/firewire/fw-transaction.h | 9 |
3 files changed, 11 insertions, 2 deletions
diff --git a/drivers/firewire/fw-card.c b/drivers/firewire/fw-card.c index 6bd91a15d5e6..17a80cecdc14 100644 --- a/drivers/firewire/fw-card.c +++ b/drivers/firewire/fw-card.c @@ -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 diff --git a/drivers/firewire/fw-topology.c b/drivers/firewire/fw-topology.c index e7520e4bd6bc..8dd6703b55cd 100644 --- a/drivers/firewire/fw-topology.c +++ b/drivers/firewire/fw-topology.c @@ -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); diff --git a/drivers/firewire/fw-transaction.h b/drivers/firewire/fw-transaction.h index c9ab12a15f6e..1d78e9cc5940 100644 --- a/drivers/firewire/fw-transaction.h +++ b/drivers/firewire/fw-transaction.h @@ -276,6 +276,15 @@ 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 * indirect payload part that is pointer to by the 'payload' field. |
