[PATCH 7/9] firewire: ohci: use devres for IT, IR, AT/receive, and AT/request contexts

[Takashi S. <o-t...@sa...>]

The 1394 OHCI driver allocates DMA coherent buffer for descriptors of IT,
IR, AT receive, and AT request contexts by the same way.

This commit utilizes managed device resource to maintain the lifetime of
buffers.

Signed-off-by: Takashi Sakamoto <o-t...@sa...>
---
 drivers/firewire/ohci.c | 23 ++++++++---------------
 1 file changed, 8 insertions(+), 15 deletions(-)

diff --git a/drivers/firewire/ohci.c b/drivers/firewire/ohci.c
index 086505bd1729..21eb13ea4dad 100644
--- a/drivers/firewire/ohci.c
+++ b/drivers/firewire/ohci.c
@@ -1105,8 +1105,7 @@ static int context_add_buffer(struct context *ctx)
 	if (ctx->total_allocation >= 16*1024*1024)
 		return -ENOMEM;
 
-	desc = dma_alloc_coherent(ctx->ohci->card.device, PAGE_SIZE,
-			&bus_addr, GFP_ATOMIC);
+	desc = dmam_alloc_coherent(ctx->ohci->card.device, PAGE_SIZE, &bus_addr, GFP_ATOMIC);
 	if (!desc)
 		return -ENOMEM;
 
@@ -1165,10 +1164,10 @@ static void context_release(struct context *ctx)
 	struct fw_card *card = &ctx->ohci->card;
 	struct descriptor_buffer *desc, *tmp;
 
-	list_for_each_entry_safe(desc, tmp, &ctx->buffer_list, list)
-		dma_free_coherent(card->device, PAGE_SIZE, desc,
-			desc->buffer_bus -
-			((void *)&desc->buffer - (void *)desc));
+	list_for_each_entry_safe(desc, tmp, &ctx->buffer_list, list) {
+		dmam_free_coherent(card->device, PAGE_SIZE, desc,
+				   desc->buffer_bus - ((void *)&desc->buffer - (void *)desc));
+	}
 }
 
 /* Must be called with ohci->lock held */
@@ -3657,7 +3656,7 @@ static int pci_probe(struct pci_dev *dev,
 	err = context_init(&ohci->at_response_ctx, ohci,
 			   OHCI1394_AsRspTrContextControlSet, handle_at_packet);
 	if (err < 0)
-		goto fail_atreq_ctx;
+		goto fail_arrsp_ctx;
 
 	reg_write(ohci, OHCI1394_IsoRecvIntMaskSet, ~0);
 	ohci->ir_context_channels = ~0ULL;
@@ -3669,7 +3668,7 @@ static int pci_probe(struct pci_dev *dev,
 	ohci->ir_context_list = devm_kzalloc(&dev->dev, size, GFP_KERNEL);
 	if (!ohci->ir_context_list) {
 		err = -ENOMEM;
-		goto fail_atresp_ctx;
+		goto fail_arrsp_ctx;
 	}
 
 	reg_write(ohci, OHCI1394_IsoXmitIntMaskSet, ~0);
@@ -3686,7 +3685,7 @@ static int pci_probe(struct pci_dev *dev,
 	ohci->it_context_list = devm_kzalloc(&dev->dev, size, GFP_KERNEL);
 	if (!ohci->it_context_list) {
 		err = -ENOMEM;
-		goto fail_atresp_ctx;
+		goto fail_arrsp_ctx;
 	}
 
 	ohci->self_id     = ohci->misc_buffer     + PAGE_SIZE/2;
@@ -3724,10 +3723,6 @@ static int pci_probe(struct pci_dev *dev,
 
  fail_msi:
 	pci_disable_msi(dev);
- fail_atresp_ctx:
-	context_release(&ohci->at_response_ctx);
- fail_atreq_ctx:
-	context_release(&ohci->at_request_ctx);
  fail_arrsp_ctx:
 	ar_context_release(&ohci->ar_response_ctx);
  fail_arreq_ctx:
@@ -3766,8 +3761,6 @@ static void pci_remove(struct pci_dev *dev)
 				  ohci->config_rom, ohci->config_rom_bus);
 	ar_context_release(&ohci->ar_request_ctx);
 	ar_context_release(&ohci->ar_response_ctx);
-	context_release(&ohci->at_request_ctx);
-	context_release(&ohci->at_response_ctx);
 	pci_disable_msi(dev);
 
 	dev_notice(&dev->dev, "removing fw-ohci device\n");
-- 
2.39.2