From 8ab1074f5527297b4bca3987908d6e996a5c9ba8 Mon Sep 17 00:00:00 2001
From: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Date: Thu, 26 Nov 2009 09:24:13 +0900
Subject: [PATCH] --- yaml --- r: 177932 b: refs/heads/master c:
 c982c368bb90adbd312faa05d0cfd842e9ab45a7 h: refs/heads/master v: v3

---
 [refs]                  |  2 +-
 trunk/drivers/scsi/st.c | 23 ++++++++++++-----------
 trunk/drivers/scsi/st.h |  1 +
 3 files changed, 14 insertions(+), 12 deletions(-)

diff --git a/[refs] b/[refs]
index b364c3c41f91..0c3f684af89d 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 78b9fb6d38b1caf1c11cba5b10bb859e3cce071f
+refs/heads/master: c982c368bb90adbd312faa05d0cfd842e9ab45a7
diff --git a/trunk/drivers/scsi/st.c b/trunk/drivers/scsi/st.c
index ad59abb47722..d04ea9a6f673 100644
--- a/trunk/drivers/scsi/st.c
+++ b/trunk/drivers/scsi/st.c
@@ -552,13 +552,15 @@ st_do_scsi(struct st_request * SRpnt, struct scsi_tape * STp, unsigned char *cmd
 	SRpnt->waiting = waiting;
 
 	if (STp->buffer->do_dio) {
+		mdata->page_order = 0;
 		mdata->nr_entries = STp->buffer->sg_segs;
 		mdata->pages = STp->buffer->mapped_pages;
 	} else {
+		mdata->page_order = STp->buffer->reserved_page_order;
 		mdata->nr_entries =
 			DIV_ROUND_UP(bytes, PAGE_SIZE << mdata->page_order);
-		STp->buffer->map_data.pages = STp->buffer->reserved_pages;
-		STp->buffer->map_data.offset = 0;
+		mdata->pages = STp->buffer->reserved_pages;
+		mdata->offset = 0;
 	}
 
 	memcpy(SRpnt->cmd, cmd, sizeof(SRpnt->cmd));
@@ -3719,7 +3721,7 @@ static int enlarge_buffer(struct st_buffer * STbuffer, int new_size, int need_dm
 		priority |= __GFP_ZERO;
 
 	if (STbuffer->frp_segs) {
-		order = STbuffer->map_data.page_order;
+		order = STbuffer->reserved_page_order;
 		b_size = PAGE_SIZE << order;
 	} else {
 		for (b_size = PAGE_SIZE, order = 0;
@@ -3752,7 +3754,7 @@ static int enlarge_buffer(struct st_buffer * STbuffer, int new_size, int need_dm
 		segs++;
 	}
 	STbuffer->b_data = page_address(STbuffer->reserved_pages[0]);
-	STbuffer->map_data.page_order = order;
+	STbuffer->reserved_page_order = order;
 
 	return 1;
 }
@@ -3765,7 +3767,7 @@ static void clear_buffer(struct st_buffer * st_bp)
 
 	for (i=0; i < st_bp->frp_segs; i++)
 		memset(page_address(st_bp->reserved_pages[i]), 0,
-		       PAGE_SIZE << st_bp->map_data.page_order);
+		       PAGE_SIZE << st_bp->reserved_page_order);
 	st_bp->cleared = 1;
 }
 
@@ -3773,7 +3775,7 @@ static void clear_buffer(struct st_buffer * st_bp)
 /* Release the extra buffer */
 static void normalize_buffer(struct st_buffer * STbuffer)
 {
-	int i, order = STbuffer->map_data.page_order;
+	int i, order = STbuffer->reserved_page_order;
 
 	for (i = 0; i < STbuffer->frp_segs; i++) {
 		__free_pages(STbuffer->reserved_pages[i], order);
@@ -3781,7 +3783,7 @@ static void normalize_buffer(struct st_buffer * STbuffer)
 	}
 	STbuffer->frp_segs = 0;
 	STbuffer->sg_segs = 0;
-	STbuffer->map_data.page_order = 0;
+	STbuffer->reserved_page_order = 0;
 	STbuffer->map_data.offset = 0;
 }
 
@@ -3791,7 +3793,7 @@ static void normalize_buffer(struct st_buffer * STbuffer)
 static int append_to_buffer(const char __user *ubp, struct st_buffer * st_bp, int do_count)
 {
 	int i, cnt, res, offset;
-	int length = PAGE_SIZE << st_bp->map_data.page_order;
+	int length = PAGE_SIZE << st_bp->reserved_page_order;
 
 	for (i = 0, offset = st_bp->buffer_bytes;
 	     i < st_bp->frp_segs && offset >= length; i++)
@@ -3823,7 +3825,7 @@ static int append_to_buffer(const char __user *ubp, struct st_buffer * st_bp, in
 static int from_buffer(struct st_buffer * st_bp, char __user *ubp, int do_count)
 {
 	int i, cnt, res, offset;
-	int length = PAGE_SIZE << st_bp->map_data.page_order;
+	int length = PAGE_SIZE << st_bp->reserved_page_order;
 
 	for (i = 0, offset = st_bp->read_pointer;
 	     i < st_bp->frp_segs && offset >= length; i++)
@@ -3856,7 +3858,7 @@ static void move_buffer_data(struct st_buffer * st_bp, int offset)
 {
 	int src_seg, dst_seg, src_offset = 0, dst_offset;
 	int count, total;
-	int length = PAGE_SIZE << st_bp->map_data.page_order;
+	int length = PAGE_SIZE << st_bp->reserved_page_order;
 
 	if (offset == 0)
 		return;
@@ -4578,7 +4580,6 @@ static int sgl_map_user_pages(struct st_buffer *STbp,
         }
 
 	mdata->offset = uaddr & ~PAGE_MASK;
-	mdata->page_order = 0;
 	STbp->mapped_pages = pages;
 
 	return nr_pages;
diff --git a/trunk/drivers/scsi/st.h b/trunk/drivers/scsi/st.h
index 544dc6b1f548..f91a67c6d968 100644
--- a/trunk/drivers/scsi/st.h
+++ b/trunk/drivers/scsi/st.h
@@ -46,6 +46,7 @@ struct st_buffer {
 	struct st_request *last_SRpnt;
 	struct st_cmdstatus cmdstat;
 	struct page **reserved_pages;
+	int reserved_page_order;
 	struct page **mapped_pages;
 	struct rq_map_data map_data;
 	unsigned char *b_data;