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firewire: core: call handler for exclusive regions outside RCU read-side critical section 

The previous commit added reference counting to ensure safe invocations of
address handlers.

This commit moves the invocation of handlers for exclusive regions outside
of the RCU read-side critical section. The address handler for the
requested region is selected within the critical section, then invoked
outside of it.

Link: https://lore.kernel.org/r/20250803122015.236493-3-o-takashi@sakamocchi.jp
Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
This commit is contained in:
Takashi Sakamoto 2025-08-03 21:20:13 +09:00
parent 7c527c15cd
commit e8cf687500
1 changed files with 9 additions and 7 deletions
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16
drivers/firewire/core-transaction.c
View File

@ -935,17 +935,19 @@ static void handle_exclusive_region_request(struct fw_card *card,
scoped_guard(rcu) {
handler = lookup_enclosing_address_handler(&address_handler_list, offset,
request->length);
if (handler) {
if (handler)
get_address_handler(handler);
handler->address_callback(card, request, tcode, destination, source,
p->generation, offset, request->data,
request->length, handler->callback_data);
put_address_handler(handler);
}
}
if (!handler)
if (!handler) {
fw_send_response(card, request, RCODE_ADDRESS_ERROR);
return;
}
// Outside the RCU read-side critical section. Without spinlock. With reference count.
handler->address_callback(card, request, tcode, destination, source, p->generation, offset,
request->data, request->length, handler->callback_data);
put_address_handler(handler);
}
static void handle_fcp_region_request(struct fw_card *card,