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| author | James Bottomley <James.Bottomley@HansenPartnership.com> | 2008-01-13 14:15:28 -0600 |
|---|---|---|
| committer | Jens Axboe <jens.axboe@oracle.com> | 2008-01-28 10:54:49 +0100 |
| commit | 7cedb1f17fb7f4374d11501f61656ae9d3ba47e9 (patch) | |
| tree | d6257751445618b827c3e41e5b8fde2704c9d716 /drivers/scsi/scsi_lib.c | |
| parent | 5ed7959ede0936c55e50421a53f153b17080e876 (diff) | |
| download | lwn-7cedb1f17fb7f4374d11501f61656ae9d3ba47e9.tar.gz lwn-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.c | 8 |
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); |