From: Webb Scales <webbnh@xxxxxx>
Move the code which sets up the SG descriptor out of hpsa_scatter_gather()
and into a subroutine where it can be reused (in the next patch). The Ext
field is now assigned unconditionally: this makes the refactor much simpler,
but more importantly it removes a conditional operation from inside the
loop. The case for which the conditional formerly tested is now executed
(unconditionally) after the loop is exited.
Reviewed-by: Scott Teel <scott.teel@xxxxxxxx>
Signed-off-by: Webb Scales <webbnh@xxxxxx>
Signed-off-by: Don Brace <don.brace@xxxxxxxx>
---
drivers/scsi/hpsa.c | 21 ++++++++++++++-------
1 file changed, 14 insertions(+), 7 deletions(-)
diff --git a/drivers/scsi/hpsa.c b/drivers/scsi/hpsa.c
index a23277d..7915dc4 100644
--- a/drivers/scsi/hpsa.c
+++ b/drivers/scsi/hpsa.c
@@ -3236,6 +3236,17 @@ out:
kfree(id_phys);
}
+static void hpsa_set_sg_descriptor(struct SGDescriptor *desc,
+ struct scatterlist *sg)
+{
+ u64 addr64 = (u64) sg_dma_address(sg);
+ unsigned int len = sg_dma_len(sg);
+
+ desc->Addr = cpu_to_le64(addr64);
+ desc->Len = cpu_to_le32(len);
+ desc->Ext = 0;
+}
+
/*
* hpsa_scatter_gather takes a struct scsi_cmnd, (cmd), and does the pci
* dma mapping and fills in the scatter gather entries of the
@@ -3245,9 +3256,7 @@ static int hpsa_scatter_gather(struct ctlr_info *h,
struct CommandList *cp,
struct scsi_cmnd *cmd)
{
- unsigned int len;
struct scatterlist *sg;
- u64 addr64;
int use_sg, i, sg_index, chained;
struct SGDescriptor *curr_sg;
@@ -3270,13 +3279,11 @@ static int hpsa_scatter_gather(struct ctlr_info *h,
curr_sg = h->cmd_sg_list[cp->cmdindex];
sg_index = 0;
}
- addr64 = (u64) sg_dma_address(sg);
- len = sg_dma_len(sg);
- curr_sg->Addr = cpu_to_le64(addr64);
- curr_sg->Len = cpu_to_le32(len);
- curr_sg->Ext = cpu_to_le32(0);
+ hpsa_set_sg_descriptor(curr_sg, sg);
curr_sg++;
}
+
+ /* Back the pointer up to the last entry and mark it as "last". */
(--curr_sg)->Ext = cpu_to_le32(HPSA_SG_LAST);
if (use_sg + chained > h->maxSG)
--
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