Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=4007b493ee6e4a52c2b618ab8361847fba5bf116
Commit: 4007b493ee6e4a52c2b618ab8361847fba5bf116
Parent: f778089cb2445dfc6dfd30a7a567925fd8589f1e
Author: Olof Johansson <[EMAIL PROTECTED]>
AuthorDate: Tue Oct 2 20:45:27 2007 -0500
Committer: Jeff Garzik <[EMAIL PROTECTED]>
CommitDate: Wed Oct 3 14:41:20 2007 -0400
libata: fix for sata_mv >64KB DMA segments
Fix bug in sata_mv for cases where the IOMMU layer has merged SG entries
to larger than 64KB. They need to be split up before being sent to
the driver.
Just for simplicity's sake, split up at 64K boundary instead of 64K size,
since that's what the common code does anyway.
Signed-off-by: Olof Johansson <[EMAIL PROTECTED]>
Signed-off-by: Jeff Garzik <[EMAIL PROTECTED]>
---
drivers/ata/sata_mv.c | 26 +++++++++++++++++++-------
1 files changed, 19 insertions(+), 7 deletions(-)
diff --git a/drivers/ata/sata_mv.c b/drivers/ata/sata_mv.c
index 11bf6c7..1a82e22 100644
--- a/drivers/ata/sata_mv.c
+++ b/drivers/ata/sata_mv.c
@@ -1139,15 +1139,27 @@ static unsigned int mv_fill_sg(struct ata_queued_cmd
*qc)
dma_addr_t addr = sg_dma_address(sg);
u32 sg_len = sg_dma_len(sg);
- mv_sg->addr = cpu_to_le32(addr & 0xffffffff);
- mv_sg->addr_hi = cpu_to_le32((addr >> 16) >> 16);
- mv_sg->flags_size = cpu_to_le32(sg_len & 0xffff);
+ while (sg_len) {
+ u32 offset = addr & 0xffff;
+ u32 len = sg_len;
- if (ata_sg_is_last(sg, qc))
- mv_sg->flags_size |= cpu_to_le32(EPRD_FLAG_END_OF_TBL);
+ if ((offset + sg_len > 0x10000))
+ len = 0x10000 - offset;
+
+ mv_sg->addr = cpu_to_le32(addr & 0xffffffff);
+ mv_sg->addr_hi = cpu_to_le32((addr >> 16) >> 16);
+ mv_sg->flags_size = cpu_to_le32(len);
+
+ sg_len -= len;
+ addr += len;
+
+ if (!sg_len && ata_sg_is_last(sg, qc))
+ mv_sg->flags_size |=
cpu_to_le32(EPRD_FLAG_END_OF_TBL);
+
+ mv_sg++;
+ n_sg++;
+ }
- mv_sg++;
- n_sg++;
}
return n_sg;
-
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