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firewire: core: use guard macro to maintain RCU scope for transaction address handler

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The core function maintains address handlers by list. RCU is utilized
for efficient read access to any entries in the list.

This commit uses guard macro to maintain RCU locking and releasing.

Link: https://lore.kernel.org/r/20240805085408.251763-6-o-takashi@sakamocchi.jp
Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
This commit is contained in:
Takashi Sakamoto 2024-08-05 17:53:56 +09:00
parent 6d72fbc816
commit eade1e1ba2
1 changed files with 15 additions and 20 deletions
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35
drivers/firewire/core-transaction.c
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@ -925,16 +925,14 @@ static void handle_exclusive_region_request(struct fw_card *card,
if (tcode == TCODE_LOCK_REQUEST)
tcode = 0x10 + async_header_get_extended_tcode(p->header);
rcu_read_lock();
handler = lookup_enclosing_address_handler(&address_handler_list,
offset, request->length);
if (handler)
handler->address_callback(card, request,
tcode, destination, source,
p->generation, offset,
request->data, request->length,
handler->callback_data);
rcu_read_unlock();
scoped_guard(rcu) {
handler = lookup_enclosing_address_handler(&address_handler_list, offset,
request->length);
if (handler)
handler->address_callback(card, request, tcode, destination, source,
p->generation, offset, request->data,
request->length, handler->callback_data);
}
if (!handler)
fw_send_response(card, request, RCODE_ADDRESS_ERROR);
@ -967,17 +965,14 @@ static void handle_fcp_region_request(struct fw_card *card,
return;
}
rcu_read_lock();
list_for_each_entry_rcu(handler, &address_handler_list, link) {
if (is_enclosing_handler(handler, offset, request->length))
handler->address_callback(card, request, tcode,
destination, source,
p->generation, offset,
request->data,
request->length,
handler->callback_data);
scoped_guard(rcu) {
list_for_each_entry_rcu(handler, &address_handler_list, link) {
if (is_enclosing_handler(handler, offset, request->length))
handler->address_callback(card, request, tcode, destination, source,
p->generation, offset, request->data,
request->length, handler->callback_data);
}
}
rcu_read_unlock();
fw_send_response(card, request, RCODE_COMPLETE);
}