From: Tejun Heo <tj@kernel.org>
Date: Sat, 18 Apr 2009 22:00:42 +0000 (+0900)
Subject: ide-floppy: block pc always uses bio
X-Git-Tag: firefly_0821_release~13979^2~144
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=8968932e54db35cf9d69cfbbd50c26dfaaa586c7;p=firefly-linux-kernel-4.4.55.git

ide-floppy: block pc always uses bio

Impact: remove unnecessary code path

Block pc requests always use bio and rq->data is always NULL.  No need
to worry about !rq->bio cases in idefloppy_block_pc_cmd().  Note that
ide-atapi uses ide_pio_bytes() for bio PIO transfer which handle sg
fine.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Jens Axboe <axboe@kernel.dk>
---

diff --git a/drivers/ide/ide-floppy.c b/drivers/ide/ide-floppy.c
index 2b4868d95f8b..3b22e066287e 100644
--- a/drivers/ide/ide-floppy.c
+++ b/drivers/ide/ide-floppy.c
@@ -216,15 +216,13 @@ static void idefloppy_blockpc_cmd(struct ide_disk_obj *floppy,
 	ide_init_pc(pc);
 	memcpy(pc->c, rq->cmd, sizeof(pc->c));
 	pc->rq = rq;
-	if (rq->data_len && rq_data_dir(rq) == WRITE)
-		pc->flags |= PC_FLAG_WRITING;
-	pc->buf = rq->data;
-	if (rq->bio)
+	if (rq->data_len) {
 		pc->flags |= PC_FLAG_DMA_OK;
-	/*
-	 * possibly problematic, doesn't look like ide-floppy correctly
-	 * handled scattered requests if dma fails...
-	 */
+		if (rq_data_dir(rq) == WRITE)
+			pc->flags |= PC_FLAG_WRITING;
+	}
+	/* pio will be performed by ide_pio_bytes() which handles sg fine */
+	pc->buf = NULL;
 	pc->req_xfer = pc->buf_size = rq->data_len;
 }