[PATCH 4/6] firewire: core: fix race with parallel PCI device probe

[Stefan Richter <stefanr@s5r6.in-berlin.de>]

The config ROM buffer received from generate_config_rom is a globally
shared static buffer.  Extend the card_mutex protection in fw_add_card
until after the config ROM was copied into the card driver's buffer.
Otherwise, parallelized card driver probes may end up with ROM contents
that were meant for a different card.

firewire-ohci's card->driver->enable hook is safe to be called within
the card_mutex.  Furthermore, it is safe to reorder card_list update
versus card enable, which simplifies the code a little.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
---
 drivers/firewire/core-card.c |   13 +++++--------
 1 file changed, 5 insertions(+), 8 deletions(-)

Index: linux-2.6.31-rc9/drivers/firewire/core-card.c
===================================================================
--- linux-2.6.31-rc9.orig/drivers/firewire/core-card.c
+++ linux-2.6.31-rc9/drivers/firewire/core-card.c
@@ -449,16 +449,13 @@ int fw_card_add(struct fw_card *card,
 	card->guid = guid;
 
 	mutex_lock(&card_mutex);
-	config_rom = generate_config_rom(card, &length);
-	list_add_tail(&card->link, &card_list);
-	mutex_unlock(&card_mutex);
 
+	config_rom = generate_config_rom(card, &length);
 	ret = card->driver->enable(card, config_rom, length);
-	if (ret < 0) {
-		mutex_lock(&card_mutex);
-		list_del(&card->link);
-		mutex_unlock(&card_mutex);
-	}
+	if (ret == 0)
+		list_add_tail(&card->link, &card_list);
+
+	mutex_unlock(&card_mutex);
 
 	return ret;
 }

-- 
Stefan Richter
-=====-==--= =--= --==-
http://arcgraph.de/sr/