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Message-ID: <20240804130225.243496-14-o-takashi@sakamocchi.jp>
Date: Sun, 4 Aug 2024 22:02:20 +0900
From: Takashi Sakamoto <o-takashi@...amocchi.jp>
To: linux1394-devel@...ts.sourceforge.net
Cc: linux-kernel@...r.kernel.org
Subject: [PATCH 13/17] firewire: core: use guard macro to maintain list of asynchronous transaction
The core function maintains pending asynchronous transactions by list in
the instance of fw_card. The concurrent access to the list is protected
by spinlock in the instance.
This commit uses guard macro to maintain the spinlock.
Signed-off-by: Takashi Sakamoto <o-takashi@...amocchi.jp>
---
drivers/firewire/core-transaction.c | 85 ++++++++++++-----------------
1 file changed, 34 insertions(+), 51 deletions(-)
diff --git a/drivers/firewire/core-transaction.c b/drivers/firewire/core-transaction.c
index a006daf385e9..0f58a5d13d28 100644
--- a/drivers/firewire/core-transaction.c
+++ b/drivers/firewire/core-transaction.c
@@ -49,35 +49,31 @@ static int close_transaction(struct fw_transaction *transaction, struct fw_card
u32 response_tstamp)
{
struct fw_transaction *t = NULL, *iter;
- unsigned long flags;
- spin_lock_irqsave(&card->lock, flags);
- list_for_each_entry(iter, &card->transaction_list, link) {
- if (iter == transaction) {
- if (!try_cancel_split_timeout(iter)) {
- spin_unlock_irqrestore(&card->lock, flags);
- goto timed_out;
+ scoped_guard(spinlock_irqsave, &card->lock) {
+ list_for_each_entry(iter, &card->transaction_list, link) {
+ if (iter == transaction) {
+ if (try_cancel_split_timeout(iter)) {
+ list_del_init(&iter->link);
+ card->tlabel_mask &= ~(1ULL << iter->tlabel);
+ t = iter;
+ }
+ break;
}
- list_del_init(&iter->link);
- card->tlabel_mask &= ~(1ULL << iter->tlabel);
- t = iter;
- break;
}
}
- spin_unlock_irqrestore(&card->lock, flags);
- if (t) {
- if (!t->with_tstamp) {
- t->callback.without_tstamp(card, rcode, NULL, 0, t->callback_data);
- } else {
- t->callback.with_tstamp(card, rcode, t->packet.timestamp, response_tstamp,
- NULL, 0, t->callback_data);
- }
- return 0;
+ if (!t)
+ return -ENOENT;
+
+ if (!t->with_tstamp) {
+ t->callback.without_tstamp(card, rcode, NULL, 0, t->callback_data);
+ } else {
+ t->callback.with_tstamp(card, rcode, t->packet.timestamp, response_tstamp, NULL, 0,
+ t->callback_data);
}
- timed_out:
- return -ENOENT;
+ return 0;
}
/*
@@ -121,16 +117,13 @@ static void split_transaction_timeout_callback(struct timer_list *timer)
{
struct fw_transaction *t = from_timer(t, timer, split_timeout_timer);
struct fw_card *card = t->card;
- unsigned long flags;
- spin_lock_irqsave(&card->lock, flags);
- if (list_empty(&t->link)) {
- spin_unlock_irqrestore(&card->lock, flags);
- return;
+ scoped_guard(spinlock_irqsave, &card->lock) {
+ if (list_empty(&t->link))
+ return;
+ list_del(&t->link);
+ card->tlabel_mask &= ~(1ULL << t->tlabel);
}
- list_del(&t->link);
- card->tlabel_mask &= ~(1ULL << t->tlabel);
- spin_unlock_irqrestore(&card->lock, flags);
if (!t->with_tstamp) {
t->callback.without_tstamp(card, RCODE_CANCELLED, NULL, 0, t->callback_data);
@@ -143,20 +136,14 @@ static void split_transaction_timeout_callback(struct timer_list *timer)
static void start_split_transaction_timeout(struct fw_transaction *t,
struct fw_card *card)
{
- unsigned long flags;
+ guard(spinlock_irqsave)(&card->lock);
- spin_lock_irqsave(&card->lock, flags);
-
- if (list_empty(&t->link) || WARN_ON(t->is_split_transaction)) {
- spin_unlock_irqrestore(&card->lock, flags);
+ if (list_empty(&t->link) || WARN_ON(t->is_split_transaction))
return;
- }
t->is_split_transaction = true;
mod_timer(&t->split_timeout_timer,
jiffies + card->split_timeout_jiffies);
-
- spin_unlock_irqrestore(&card->lock, flags);
}
static u32 compute_split_timeout_timestamp(struct fw_card *card, u32 request_timestamp);
@@ -1015,7 +1002,6 @@ EXPORT_SYMBOL(fw_core_handle_request);
void fw_core_handle_response(struct fw_card *card, struct fw_packet *p)
{
struct fw_transaction *t = NULL, *iter;
- unsigned long flags;
u32 *data;
size_t data_length;
int tcode, tlabel, source, rcode;
@@ -1054,26 +1040,23 @@ void fw_core_handle_response(struct fw_card *card, struct fw_packet *p)
break;
}
- spin_lock_irqsave(&card->lock, flags);
- list_for_each_entry(iter, &card->transaction_list, link) {
- if (iter->node_id == source && iter->tlabel == tlabel) {
- if (!try_cancel_split_timeout(iter)) {
- spin_unlock_irqrestore(&card->lock, flags);
- goto timed_out;
+ scoped_guard(spinlock_irqsave, &card->lock) {
+ list_for_each_entry(iter, &card->transaction_list, link) {
+ if (iter->node_id == source && iter->tlabel == tlabel) {
+ if (try_cancel_split_timeout(iter)) {
+ list_del_init(&iter->link);
+ card->tlabel_mask &= ~(1ULL << iter->tlabel);
+ t = iter;
+ }
+ break;
}
- list_del_init(&iter->link);
- card->tlabel_mask &= ~(1ULL << iter->tlabel);
- t = iter;
- break;
}
}
- spin_unlock_irqrestore(&card->lock, flags);
trace_async_response_inbound((uintptr_t)t, card->index, p->generation, p->speed, p->ack,
p->timestamp, p->header, data, data_length / 4);
if (!t) {
- timed_out:
fw_notice(card, "unsolicited response (source %x, tlabel %x)\n",
source, tlabel);
return;
--
2.43.0
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