提交 e9aeb46c 编写于 作者: S Stefan Richter

firewire: fully initialize fw_transaction before marking it pending

In theory, card->flush_timer could already access a transaction between
fw_send_request()'s spin_unlock_irqrestore and the rest of what happens
in fw_send_request().  This would happen if the process which sends the
request is preempted and put to sleep right after spin_unlock_irqrestore
for longer than 100ms.

Therefore we fill in everything in struct fw_transaction at which the
flush_timer might look at before we lift the lock.

To do:  Ensure that the timer does not pick up the transaction before
the time of the AT request event plus split transaction timeout.
Signed-off-by: NStefan Richter <stefanr@s5r6.in-berlin.de>
上级 792a6102
......@@ -279,11 +279,6 @@ fw_send_request(struct fw_card *card, struct fw_transaction *t,
card->current_tlabel = (card->current_tlabel + 1) & 0x1f;
card->tlabel_mask |= (1 << tlabel);
list_add_tail(&t->link, &card->transaction_list);
spin_unlock_irqrestore(&card->lock, flags);
/* Initialize rest of transaction, fill out packet and send it. */
t->node_id = node_id;
t->tlabel = tlabel;
t->callback = callback;
......@@ -294,6 +289,10 @@ fw_send_request(struct fw_card *card, struct fw_transaction *t,
speed, offset, payload, length);
t->packet.callback = transmit_complete_callback;
list_add_tail(&t->link, &card->transaction_list);
spin_unlock_irqrestore(&card->lock, flags);
card->driver->send_request(card, &t->packet);
}
EXPORT_SYMBOL(fw_send_request);
......
Markdown is supported
0% .
You are about to add 0 people to the discussion. Proceed with caution.
先完成此消息的编辑!
想要评论请 注册