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authorJames Bottomley <James.Bottomley@HansenPartnership.com>2008-01-13 21:15:28 +0100
committerJens Axboe <jens.axboe@oracle.com>2008-01-28 10:54:49 +0100
commit7cedb1f17fb7f4374d11501f61656ae9d3ba47e9 (patch)
treed6257751445618b827c3e41e5b8fde2704c9d716 /drivers/scsi/scsi_lib.c
parentSG: Convert SCSI to use scatterlist helpers for sg chaining (diff)
downloadlinux-7cedb1f17fb7f4374d11501f61656ae9d3ba47e9.tar.xz
linux-7cedb1f17fb7f4374d11501f61656ae9d3ba47e9.zip
SG: work with the SCSI fixed maximum allocations.
SCSI sg table allocation has a maximum size (of SCSI_MAX_SG_SEGMENTS, currently 128) and this will cause a BUG_ON() in SCSI if something tries an allocation over it. This patch adds a size limit to the chaining allocator to allow the specification of the maximum allocation size for chaining, so we always chain in units of the maximum SCSI allocation size. Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'drivers/scsi/scsi_lib.c')
-rw-r--r--drivers/scsi/scsi_lib.c8
1 files changed, 5 insertions, 3 deletions
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index 3b5121c4c081..eb4911a61641 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -761,9 +761,11 @@ int scsi_alloc_sgtable(struct scsi_cmnd *cmd, gfp_t gfp_mask)
BUG_ON(!cmd->use_sg);
- ret = __sg_alloc_table(&cmd->sg_table, cmd->use_sg, gfp_mask, scsi_sg_alloc);
+ ret = __sg_alloc_table(&cmd->sg_table, cmd->use_sg,
+ SCSI_MAX_SG_SEGMENTS, gfp_mask, scsi_sg_alloc);
if (unlikely(ret))
- __sg_free_table(&cmd->sg_table, scsi_sg_free);
+ __sg_free_table(&cmd->sg_table, SCSI_MAX_SG_SEGMENTS,
+ scsi_sg_free);
cmd->request_buffer = cmd->sg_table.sgl;
return ret;
@@ -773,7 +775,7 @@ EXPORT_SYMBOL(scsi_alloc_sgtable);
void scsi_free_sgtable(struct scsi_cmnd *cmd)
{
- __sg_free_table(&cmd->sg_table, scsi_sg_free);
+ __sg_free_table(&cmd->sg_table, SCSI_MAX_SG_SEGMENTS, scsi_sg_free);
}
EXPORT_SYMBOL(scsi_free_sgtable);