Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=36abb3b18e26bf980e8529512853c5d73971a48b
Commit: 36abb3b18e26bf980e8529512853c5d73971a48b
Parent: e1b68c4dcfb8bb7d79b6771e48767039ffbe00a8
Author: Kristian Høgsberg, Stefan Richter <[EMAIL PROTECTED]>
AuthorDate: Wed May 9 19:23:10 2007 -0400
Committer: Stefan Richter <[EMAIL PROTECTED]>
CommitDate: Thu May 10 18:24:14 2007 +0200
firewire: Add a comment to describe why we split the sg list.
Signed-off-by: Kristian Hoegsberg <[EMAIL PROTECTED]>
Signed-off-by: Stefan Richter <[EMAIL PROTECTED]>
---
drivers/firewire/fw-sbp2.c | 5 ++++-
1 files changed, 4 insertions(+), 1 deletions(-)
diff --git a/drivers/firewire/fw-sbp2.c b/drivers/firewire/fw-sbp2.c
index 07be24e..cb808d5 100644
--- a/drivers/firewire/fw-sbp2.c
+++ b/drivers/firewire/fw-sbp2.c
@@ -926,7 +926,10 @@ static int sbp2_command_orb_map_scatterlist(struct
sbp2_command_orb *orb)
/*
* Convert the scatterlist to an sbp2 page table. If any
- * scatterlist entries are too big for sbp2 we split the as we go.
+ * scatterlist entries are too big for sbp2, we split them as we
+ * go. Even if we ask the block I/O layer to not give us sg
+ * elements larger than 65535 bytes, some IOMMUs may merge sg elements
+ * during DMA mapping, and Linux currently doesn't prevent this.
*/
for (i = 0, j = 0; i < count; i++) {
sg_len = sg_dma_len(sg + i);
-
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