firewire: core: convert AR-req handler lock from _irqsave to _bh

fw_core_handle_request() is called by the low-level driver in tasklet
context or process context, and fw_core_add/remove_address_handler() is
called by mid- or high-level code in process context.  So convert
address_handler_lock accesses from those which disable local IRQs to
ones which just disable local softIRQs.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>

diff --git a/drivers/firewire/core-transaction.c b/drivers/firewire/core-transaction.c
index 190bf61..dea2dcc 100644 (file)
--- a/drivers/firewire/core-transaction.c
+++ b/drivers/firewire/core-transaction.c
@@ -565,7 +565,6 @@ int fw_core_add_address_handler(struct fw_address_handler *handler,
                                const struct fw_address_region *region)
 {
        struct fw_address_handler *other;
-       unsigned long flags;
        int ret = -EBUSY;
 
        if (region->start & 0xffff000000000003ULL ||
@@ -575,7 +574,7 @@ int fw_core_add_address_handler(struct fw_address_handler *handler,
            handler->length == 0)
                return -EINVAL;
 
-       spin_lock_irqsave(&address_handler_lock, flags);
+       spin_lock_bh(&address_handler_lock);
 
        handler->offset = region->start;
        while (handler->offset + handler->length <= region->end) {
@@ -594,7 +593,7 @@ int fw_core_add_address_handler(struct fw_address_handler *handler,
                }
        }
 
-       spin_unlock_irqrestore(&address_handler_lock, flags);
+       spin_unlock_bh(&address_handler_lock);
 
        return ret;
 }
@@ -608,11 +607,9 @@ EXPORT_SYMBOL(fw_core_add_address_handler);
  */
 void fw_core_remove_address_handler(struct fw_address_handler *handler)
 {
-       unsigned long flags;
-
-       spin_lock_irqsave(&address_handler_lock, flags);
+       spin_lock_bh(&address_handler_lock);
        list_del(&handler->link);
-       spin_unlock_irqrestore(&address_handler_lock, flags);
+       spin_unlock_bh(&address_handler_lock);
 }
 EXPORT_SYMBOL(fw_core_remove_address_handler);
 
@@ -829,7 +826,6 @@ static void handle_exclusive_region_request(struct fw_card *card,
                                            unsigned long long offset)
 {
        struct fw_address_handler *handler;
-       unsigned long flags;
        int tcode, destination, source;
 
        destination = HEADER_GET_DESTINATION(p->header[0]);
@@ -838,7 +834,7 @@ static void handle_exclusive_region_request(struct fw_card *card,
        if (tcode == TCODE_LOCK_REQUEST)
                tcode = 0x10 + HEADER_GET_EXTENDED_TCODE(p->header[3]);
 
-       spin_lock_irqsave(&address_handler_lock, flags);
+       spin_lock_bh(&address_handler_lock);
        handler = lookup_enclosing_address_handler(&address_handler_list,
                                                   offset, request->length);
        if (handler)
@@ -847,7 +843,7 @@ static void handle_exclusive_region_request(struct fw_card *card,
                                          p->generation, offset,
                                          request->data, request->length,
                                          handler->callback_data);
-       spin_unlock_irqrestore(&address_handler_lock, flags);
+       spin_unlock_bh(&address_handler_lock);
 
        if (!handler)
                fw_send_response(card, request, RCODE_ADDRESS_ERROR);
@@ -859,7 +855,6 @@ static void handle_fcp_region_request(struct fw_card *card,
                                      unsigned long long offset)
 {
        struct fw_address_handler *handler;
-       unsigned long flags;
        int tcode, destination, source;
 
        if ((offset != (CSR_REGISTER_BASE | CSR_FCP_COMMAND) &&
@@ -881,7 +876,7 @@ static void handle_fcp_region_request(struct fw_card *card,
                return;
        }
 
-       spin_lock_irqsave(&address_handler_lock, flags);
+       spin_lock_bh(&address_handler_lock);
        list_for_each_entry(handler, &address_handler_list, link) {
                if (is_enclosing_handler(handler, offset, request->length))
                        handler->address_callback(card, NULL, tcode,
@@ -891,7 +886,7 @@ static void handle_fcp_region_request(struct fw_card *card,
                                                  request->length,
                                                  handler->callback_data);
        }
-       spin_unlock_irqrestore(&address_handler_lock, flags);
+       spin_unlock_bh(&address_handler_lock);
 
        fw_send_response(card, request, RCODE_COMPLETE);
 }