linux-kernel - Re: swiotlb default size (64 MB) too small?

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Message-Id: <20090127183723W.fujita.tomonori@lab.ntt.co.jp>
Date:	Tue, 27 Jan 2009 18:36:47 +0900
From:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	stefanr@...6.in-berlin.de
Cc:	fujita.tomonori@....ntt.co.jp, linux-kernel@...r.kernel.org,
	linux-scsi@...r.kernel.org
Subject: Re: swiotlb default size (64 MB) too small?

On Tue, 27 Jan 2009 16:54:30 +0900
FUJITA Tomonori <fujita.tomonori@....ntt.co.jp> wrote:

> > *) The report does not sound like there was a DMA mappig leak caused by
> > copying between usb-storage and firewire-sbp2.  Else he would have hit
> > the problem again even with increased swiotlb default size.
> 
> Maybe the reporter doesn't copy enough to hit the deadlock.

Hmm, we don't have leak here?

=
From: FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
Subject: [PATCH] fw-sbp2: fix dma mapping leak on the failure path

Signed-off-by: FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
---
 drivers/firewire/fw-sbp2.c |   12 +++++++++++-
 1 files changed, 11 insertions(+), 1 deletions(-)

diff --git a/drivers/firewire/fw-sbp2.c b/drivers/firewire/fw-sbp2.c
index e88d506..d40910d 100644
--- a/drivers/firewire/fw-sbp2.c
+++ b/drivers/firewire/fw-sbp2.c
@@ -1491,8 +1491,18 @@ static int sbp2_scsi_queuecommand(struct scsi_cmnd *cmd, scsi_done_fn_t done)
 	orb->base.request_bus =
 		dma_map_single(device->card->device, &orb->request,
 			       sizeof(orb->request), DMA_TO_DEVICE);
-	if (dma_mapping_error(device->card->device, orb->base.request_bus))
+	if (dma_mapping_error(device->card->device, orb->base.request_bus)) {
+		if (scsi_sg_count(cmd)) {
+			dma_unmap_sg(device->card->device, scsi_sglist(cmd),
+				     scsi_sg_count(cmd),
+				     cmd->sc_data_direction);
+			dma_unmap_single(device->card->device,
+					 orb->page_table_bus,
+					 sizeof(orb->page_table),
+					 DMA_TO_DEVICE);
+		}
 		goto out;
+	}
 
 	sbp2_send_orb(&orb->base, lu, lu->tgt->node_id, generation,
 		      lu->command_block_agent_address + SBP2_ORB_POINTER);
-- 
1.6.0.6


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