firewire: core: add forgotten dummy driver methods, remove unused ones

There is an at least theoretic race condition in which .start_iso etc.
could still be called between when the dummy driver is bound to the card
and when the children devices are being shut down.  Add dummy_start_iso
and friends.

On the other hand, .enable, .set_config_rom, .read_csr, write_csr do not
need to be implemented by the dummy driver, as commented.
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>

drivers/firewire/core-card.c

@@ -538,15 +538,13 @@ EXPORT_SYMBOL(fw_card_add);
  * as all IO to the card will be handled (and failed) by the dummy driver
  * instead of calling into the module.  Only functions for iso context
  * shutdown still need to be provided by the card driver.
+ *
+ * .read/write_csr() should never be called anymore after the dummy driver
+ * was bound since they are only used within request handler context.
+ * .set_config_rom() is never called since the card is taken out of card_list
+ * before switching to the dummy driver.
  */
 
-static int dummy_enable(struct fw_card *card,
-			const __be32 *config_rom, size_t length)
-{
-	BUG();
-	return -1;
-}
-
 static int dummy_read_phy_reg(struct fw_card *card, int address)
 {
 	return -ENODEV;
@@ -558,17 +556,6 @@ static int dummy_update_phy_reg(struct fw_card *card, int address,
 	return -ENODEV;
 }
 
-static int dummy_set_config_rom(struct fw_card *card,
-				const __be32 *config_rom, size_t length)
-{
-	/*
-	 * We take the card out of card_list before setting the dummy
-	 * driver, so this should never get called.
-	 */
-	BUG();
-	return -1;
-}
-
 static void dummy_send_request(struct fw_card *card, struct fw_packet *packet)
 {
 	packet->callback(packet, card, RCODE_CANCELLED);
@@ -590,15 +577,40 @@ static int dummy_enable_phys_dma(struct fw_card *card,
 	return -ENODEV;
 }
 
+static struct fw_iso_context *dummy_allocate_iso_context(struct fw_card *card,
+				int type, int channel, size_t header_size)
+{
+	return ERR_PTR(-ENODEV);
+}
+
+static int dummy_start_iso(struct fw_iso_context *ctx,
+			   s32 cycle, u32 sync, u32 tags)
+{
+	return -ENODEV;
+}
+
+static int dummy_set_iso_channels(struct fw_iso_context *ctx, u64 *channels)
+{
+	return -ENODEV;
+}
+
+static int dummy_queue_iso(struct fw_iso_context *ctx, struct fw_iso_packet *p,
+			   struct fw_iso_buffer *buffer, unsigned long payload)
+{
+	return -ENODEV;
+}
+
 static const struct fw_card_driver dummy_driver_template = {
-	.enable          = dummy_enable,
 	.read_phy_reg		= dummy_read_phy_reg,
 	.update_phy_reg		= dummy_update_phy_reg,
-	.set_config_rom  = dummy_set_config_rom,
 	.send_request		= dummy_send_request,
-	.cancel_packet   = dummy_cancel_packet,
 	.send_response		= dummy_send_response,
+	.cancel_packet		= dummy_cancel_packet,
 	.enable_phys_dma	= dummy_enable_phys_dma,
+	.allocate_iso_context	= dummy_allocate_iso_context,
+	.start_iso		= dummy_start_iso,
+	.set_iso_channels	= dummy_set_iso_channels,
+	.queue_iso		= dummy_queue_iso,
 };
 
 void fw_card_release(struct kref *kref)