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List: linux1394-devel
Subject: [patch 2/4] firewire: fully initialize fw_transaction before marking
From: Stefan Richter <stefanr () s5r6 ! in-berlin ! de>
Date: 2008-07-12 12:50:06
Message-ID: tkrat.9a558c6224aca75b () s5r6 ! in-berlin ! de
[Download RAW message or body]
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: Stefan Richter <stefanr@s5r6.in-berlin.de>
---
drivers/firewire/fw-transaction.c | 9 ++++-----
1 file changed, 4 insertions(+), 5 deletions(-)
Index: linux/drivers/firewire/fw-transaction.c
===================================================================
--- linux.orig/drivers/firewire/fw-transaction.c
+++ linux/drivers/firewire/fw-transaction.c
@@ -279,11 +279,6 @@ fw_send_request(struct fw_card *card, st
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, st
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);
--
Stefan Richter
-=====-==--- -=== -==--
http://arcgraph.de/sr/
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