[PATCH V5 15/16] scsi: wd33c93: use sg helper to operate scatterlist

Ming Lei ming.lei at redhat.com
Tue Jun 18 01:37:56 UTC 2019

Use the scatterlist iterators and remove direct indexing of the
scatterlist array.

This way allows us to pre-allocate one small scatterlist, which can be
chained with one runtime allocated scatterlist if the pre-allocated one
isn't enough for the whole request.

Reviewed-by: Christoph Hellwig <hch at lst.de>
Reviewed-by: Bart Van Assche <bvanassche at acm.org>
Signed-off-by: Ming Lei <ming.lei at redhat.com>
 drivers/scsi/wd33c93.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/scsi/wd33c93.c b/drivers/scsi/wd33c93.c
index 74be04f2357c..ae5935c0a149 100644
--- a/drivers/scsi/wd33c93.c
+++ b/drivers/scsi/wd33c93.c
@@ -744,7 +744,7 @@ transfer_bytes(const wd33c93_regs regs, struct scsi_cmnd *cmd,
  * source or destination for THIS transfer.
 	if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) {
-		++cmd->SCp.buffer;
+		cmd->SCp.buffer = sg_next(cmd->SCp.buffer);
 		cmd->SCp.this_residual = cmd->SCp.buffer->length;
 		cmd->SCp.ptr = sg_virt(cmd->SCp.buffer);

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