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authorStefan Richter <stefanr@s5r6.in-berlin.de>2009-06-14 13:23:58 +0200
committerStefan Richter <stefanr@s5r6.in-berlin.de>2009-06-14 14:23:42 +0200
commit1e626fdcef61460dc75fe7377f38bb019722b848 (patch)
tree5ae5587507b07ff4832d1f3c53fe4dd01a8636d3 /drivers/firewire
parent837ec787d85fda8d73193a399ebcea0288e4765b (diff)
firewire: core: use more outbound tlabels
Tlabel is a 6 bits wide datum. Wrap it after 63 rather than 31 for more safety against transaction label exhaustion and potential responders' transaction layer bugs. (As noted by Guus Sliepen, this change requires an expansion of tlabel_mask to 64 bits.) Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Diffstat (limited to 'drivers/firewire')
-rw-r--r--drivers/firewire/core-transaction.c8
1 files changed, 4 insertions, 4 deletions
diff --git a/drivers/firewire/core-transaction.c b/drivers/firewire/core-transaction.c
index 9a6ce9ab2a6..479b22f5a1e 100644
--- a/drivers/firewire/core-transaction.c
+++ b/drivers/firewire/core-transaction.c
@@ -82,7 +82,7 @@ static int close_transaction(struct fw_transaction *transaction,
list_for_each_entry(t, &card->transaction_list, link) {
if (t == transaction) {
list_del(&t->link);
- card->tlabel_mask &= ~(1 << t->tlabel);
+ card->tlabel_mask &= ~(1ULL << t->tlabel);
break;
}
}
@@ -288,14 +288,14 @@ void fw_send_request(struct fw_card *card, struct fw_transaction *t, int tcode,
spin_lock_irqsave(&card->lock, flags);
tlabel = card->current_tlabel;
- if (card->tlabel_mask & (1 << tlabel)) {
+ if (card->tlabel_mask & (1ULL << tlabel)) {
spin_unlock_irqrestore(&card->lock, flags);
callback(card, RCODE_SEND_ERROR, NULL, 0, callback_data);
return;
}
- card->current_tlabel = (card->current_tlabel + 1) & 0x1f;
- card->tlabel_mask |= (1 << tlabel);
+ card->current_tlabel = (card->current_tlabel + 1) & 0x3f;
+ card->tlabel_mask |= (1ULL << tlabel);
t->node_id = destination_id;
t->tlabel = tlabel;