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| author | Jeff Garzik <jeff@garzik.org> | 2007-10-09 13:51:57 -0400 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-10-09 12:38:26 -0700 |
| commit | baf14aa14efcfdb5a74d5cf804691086c6bec743 (patch) | |
| tree | 3c8cb3e429253cea3c5e474892efb722834e9378 | |
| parent | e2a57a815933b2d2e375f9de6be223098024ab90 (diff) | |
| download | lwn-baf14aa14efcfdb5a74d5cf804691086c6bec743.tar.gz lwn-baf14aa14efcfdb5a74d5cf804691086c6bec743.zip | |
sata_mv: correct S/G table limits
The recent mv_fill_sg() rewrite, to fix a data corruption problem
related to IOMMU virtual merging, forgot to account for the
potentially-increased size of the scatter/gather table after its run.
Additionally, the DMA boundary is reduced from 0xffffffff to 0xffff
to more closely match the needs of mv_fill_sg().
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | drivers/ata/sata_mv.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/drivers/ata/sata_mv.c b/drivers/ata/sata_mv.c index 1a82e22b3efd..cb7dec97fee6 100644 --- a/drivers/ata/sata_mv.c +++ b/drivers/ata/sata_mv.c @@ -313,7 +313,10 @@ enum { #define IS_GEN_IIE(hpriv) ((hpriv)->hp_flags & MV_HP_GEN_IIE) enum { - MV_DMA_BOUNDARY = 0xffffffffU, + /* DMA boundary 0xffff is required by the s/g splitting + * we need on /length/ in mv_fill-sg(). + */ + MV_DMA_BOUNDARY = 0xffffU, /* mask of register bits containing lower 32 bits * of EDMA request queue DMA address @@ -448,7 +451,7 @@ static struct scsi_host_template mv5_sht = { .queuecommand = ata_scsi_queuecmd, .can_queue = ATA_DEF_QUEUE, .this_id = ATA_SHT_THIS_ID, - .sg_tablesize = MV_MAX_SG_CT, + .sg_tablesize = MV_MAX_SG_CT / 2, .cmd_per_lun = ATA_SHT_CMD_PER_LUN, .emulated = ATA_SHT_EMULATED, .use_clustering = 1, @@ -466,7 +469,7 @@ static struct scsi_host_template mv6_sht = { .queuecommand = ata_scsi_queuecmd, .can_queue = ATA_DEF_QUEUE, .this_id = ATA_SHT_THIS_ID, - .sg_tablesize = MV_MAX_SG_CT, + .sg_tablesize = MV_MAX_SG_CT / 2, .cmd_per_lun = ATA_SHT_CMD_PER_LUN, .emulated = ATA_SHT_EMULATED, .use_clustering = 1, |