block: remove struct request buffer member

This was used in the olden days, back when onions were proper
yellow. Basically it mapped to the current buffer to be
transferred. With highmem being added more than a decade ago,
most drivers map pages out of a bio, and rq->buffer isn't
pointing at anything valid.

Convert old style drivers to just use bio_data().

For the discard payload use case, just reference the page
in the bio.

Signed-off-by: Jens Axboe <axboe@fb.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/drivers/block/xsysace.c b/drivers/block/xsysace.c
index 1393b8871a28..ab3ea62e5dfc 100644
--- a/drivers/block/xsysace.c
+++ b/drivers/block/xsysace.c
@@ -661,7 +661,7 @@ static void ace_fsm_dostate(struct ace_device *ace)
 			rq_data_dir(req));
 
 		ace->req = req;
-		ace->data_ptr = req->buffer;
+		ace->data_ptr = bio_data(req->bio);
 		ace->data_count = blk_rq_cur_sectors(req) * ACE_BUF_PER_SECTOR;
 		ace_out32(ace, ACE_MPULBA, blk_rq_pos(req) & 0x0FFFFFFF);
 
@@ -733,7 +733,7 @@ static void ace_fsm_dostate(struct ace_device *ace)
 			 *      blk_rq_sectors(ace->req),
 			 *      blk_rq_cur_sectors(ace->req));
 			 */
-			ace->data_ptr = ace->req->buffer;
+			ace->data_ptr = bio_data(ace->req->bio);
 			ace->data_count = blk_rq_cur_sectors(ace->req) * 16;
 			ace_fsm_yieldirq(ace);
 			break;