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authorClemens Ladisch <clemens@ladisch.de>2010-08-18 15:05:02 +0200
committerStefan Richter <stefanr@s5r6.in-berlin.de>2010-08-19 20:28:25 +0200
commit2222bcb76790f4f61f39ec1514946a7593b07e02 (patch)
treef479ec53c083071d70935b51eb7adab844233779
parent1bf145fed572583d4cb7c1784689a0b42c997ba6 (diff)
firewire: core: do not use del_timer_sync() in interrupt context
Because we might be in interrupt context, replace del_timer_sync() with del_timer(). If the timer is already running, we know that it will clean up the transaction, so we do not need to do any further processing in the normal transaction handler. Many thanks to Yong Zhang for diagnosing this. Reported-by: Stefan Richter <stefanr@s5r6.in-berlin.de> Signed-off-by: Clemens Ladisch <clemens@ladisch.de> Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
-rw-r--r--drivers/firewire/core-transaction.c13
1 files changed, 10 insertions, 3 deletions
diff --git a/drivers/firewire/core-transaction.c b/drivers/firewire/core-transaction.c
index ca7ca56661e0..b42a0bde8494 100644
--- a/drivers/firewire/core-transaction.c
+++ b/drivers/firewire/core-transaction.c
@@ -81,6 +81,10 @@ static int close_transaction(struct fw_transaction *transaction,
spin_lock_irqsave(&card->lock, flags);
list_for_each_entry(t, &card->transaction_list, link) {
if (t == transaction) {
+ if (!del_timer(&t->split_timeout_timer)) {
+ spin_unlock_irqrestore(&card->lock, flags);
+ goto timed_out;
+ }
list_del_init(&t->link);
card->tlabel_mask &= ~(1ULL << t->tlabel);
break;
@@ -89,11 +93,11 @@ static int close_transaction(struct fw_transaction *transaction,
spin_unlock_irqrestore(&card->lock, flags);
if (&t->link != &card->transaction_list) {
- del_timer_sync(&t->split_timeout_timer);
t->callback(card, rcode, NULL, 0, t->callback_data);
return 0;
}
+ timed_out:
return -ENOENT;
}
@@ -921,6 +925,10 @@ void fw_core_handle_response(struct fw_card *card, struct fw_packet *p)
spin_lock_irqsave(&card->lock, flags);
list_for_each_entry(t, &card->transaction_list, link) {
if (t->node_id == source && t->tlabel == tlabel) {
+ if (!del_timer(&t->split_timeout_timer)) {
+ spin_unlock_irqrestore(&card->lock, flags);
+ goto timed_out;
+ }
list_del_init(&t->link);
card->tlabel_mask &= ~(1ULL << t->tlabel);
break;
@@ -929,6 +937,7 @@ void fw_core_handle_response(struct fw_card *card, struct fw_packet *p)
spin_unlock_irqrestore(&card->lock, flags);
if (&t->link == &card->transaction_list) {
+ timed_out:
fw_notify("Unsolicited response (source %x, tlabel %x)\n",
source, tlabel);
return;
@@ -963,8 +972,6 @@ void fw_core_handle_response(struct fw_card *card, struct fw_packet *p)
break;
}
- del_timer_sync(&t->split_timeout_timer);
-
/*
* The response handler may be executed while the request handler
* is still pending. Cancel the request handler.

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