Commit a55709ba authored by Jay Fenlason's avatar Jay Fenlason Committed by Stefan Richter
Browse files

firewire: fw-ohci: don't leak dma memory on module removal 



The transmit and receive context dma memory was not being freed on
module removal.  Neither was the config rom memory.  Fix that.

The ab->next assignment is pure paranoia.

Signed-off-by: default avatarJay Fenlason <fenlason@redhat.com>
Signed-off-by: default avatarStefan Richter <stefanr@s5r6.in-berlin.de>
parent 77e55719

drivers/firewire/fw-ohci.c

+27 −0
Original line number Diff line number Diff line
@@ -476,6 +476,7 @@ static int ar_context_add_page(struct ar_context *ctx) 
	if (ab == NULL)

		return -ENOMEM;



	ab->next = NULL;

	memset(&ab->descriptor, 0, sizeof(ab->descriptor));

	ab->descriptor.control        = cpu_to_le16(DESCRIPTOR_INPUT_MORE |

						    DESCRIPTOR_STATUS |
@@ -496,6 +497,21 @@ static int ar_context_add_page(struct ar_context *ctx) 
	return 0;

}



static void ar_context_release(struct ar_context *ctx)

{

	struct ar_buffer *ab, *ab_next;

	size_t offset;

	dma_addr_t ab_bus;



	for (ab = ctx->current_buffer; ab; ab = ab_next) {

		ab_next = ab->next;

		offset = offsetof(struct ar_buffer, data);

		ab_bus = le32_to_cpu(ab->descriptor.data_address) - offset;

		dma_free_coherent(ctx->ohci->card.device, PAGE_SIZE,

				  ab, ab_bus);

	}

}



#if defined(CONFIG_PPC_PMAC) && defined(CONFIG_PPC32)

#define cond_le32_to_cpu(v) \

	(ohci->old_uninorth ? (__force __u32)(v) : le32_to_cpu(v))
@@ -2491,8 +2507,19 @@ static void pci_remove(struct pci_dev *dev) 


	software_reset(ohci);

	free_irq(dev->irq, ohci);



	if (ohci->next_config_rom && ohci->next_config_rom != ohci->config_rom)

		dma_free_coherent(ohci->card.device, CONFIG_ROM_SIZE,

				  ohci->next_config_rom, ohci->next_config_rom_bus);

	if (ohci->config_rom)

		dma_free_coherent(ohci->card.device, CONFIG_ROM_SIZE,

				  ohci->config_rom, ohci->config_rom_bus);

	dma_free_coherent(ohci->card.device, SELF_ID_BUF_SIZE,

			  ohci->self_id_cpu, ohci->self_id_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);

	kfree(ohci->it_context_list);

	kfree(ohci->ir_context_list);

	pci_iounmap(dev, ohci->registers);