[SCSI] st: fix mdata->page_order handling

[safe/jmp/linux-2.6] / drivers / scsi / st.c

diff --git a/drivers/scsi/st.c b/drivers/scsi/st.c
index b33d042..d04ea9a 100644 (file)
--- a/drivers/scsi/st.c
+++ b/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));
@@ -2280,7 +2282,8 @@ static int st_set_options(struct scsi_tape *STp, long options)
        } else if (code == MT_ST_SET_CLN) {
                value = (options & ~MT_ST_OPTIONS) & 0xff;
                if (value != 0 &&
-                   value < EXTENDED_SENSE_START && value >= SCSI_SENSE_BUFFERSIZE)
+                       (value < EXTENDED_SENSE_START ||
+                               value >= SCSI_SENSE_BUFFERSIZE))
                        return (-EINVAL);
                STp->cln_mode = value;
                STp->cln_sense_mask = (options >> 8) & 0xff;
@@ -2859,11 +2862,8 @@ static int st_int_ioctl(struct scsi_tape *STp, unsigned int cmd_in, unsigned lon
                        ioctl_result = st_int_ioctl(STp, MTBSF, 1);
 
                if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) {
-                       int old_block_size = STp->block_size;
                        STp->block_size = arg & MT_ST_BLKSIZE_MASK;
                        if (STp->block_size != 0) {
-                               if (old_block_size == 0)
-                                       normalize_buffer(STp->buffer);
                                (STp->buffer)->buffer_blocks =
                                    (STp->buffer)->buffer_size / STp->block_size;
                        }
@@ -3721,7 +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;
@@ -3754,7 +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;
 }
@@ -3767,7 +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;
 }
 
@@ -3775,7 +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);
@@ -3783,7 +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;
 }
 
@@ -3793,7 +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++)
@@ -3825,7 +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++)
@@ -3858,7 +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;
@@ -4580,7 +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;